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Search for "Stille coupling" in Full Text gives 37 result(s) in Beilstein Journal of Organic Chemistry.
Pyridinoacridine alkaloids of marine origin: NMR and MS spectral data, synthesis, biosynthesis and biological activity
- Louis P. Sandjo,
- Victor Kuete and
- Maique W. Biavatti
Beilstein J. Org. Chem. 2015, 11, 1667–1699, doi:10.3762/bjoc.11.183
- was subsequently transformed into a quinolone benzyl ether under reflux conditions. A quinoline triflate ester was prepared from the quinolone and coupled to trimethyl(2-nitrophenyl)stannane by Stille coupling catalyzed by palladium acetate. The afforded nitrophenylquinoline was hydrolyzed and
- , while in method B, the cyclisation was performed in a radical mechanism manner. Whereas the radical condition afforded a low yield of the expected product, the Stille coupling seems to be a better solution. Synthesis of demethyldeoxyamphimedine (9) The synthesis of demethyldeoxyamphimedine was
Graphical Abstract
Figure 1: Fragments produced by the FAB–MS of dehydrokuanoniamine B (20) [42].
Figure 2: Fragments produced by the EIMS of sagitol (26) [55].
Figure 3: Fragments produced by the EIMS of styelsamine B (4) [45].
Figure 4: Fragments produced by the EIMS of styelsamine D (6) [45].
Figure 5: Fragments produced by the EIMS of subarine (37) [40].
Scheme 1: Synthesis of styelsamine B (4) and cystodytin J (1) [58].
Scheme 2: Synthesis of sebastianine A (38) and its regioisomer 39 [59].
Scheme 3: Synthesis route A of neoamphimedine (12) [61].
Scheme 4: Synthesis route B of neoamphimedine (12) [62].
Scheme 5: Synthesis of arnoamines A (40) and B (41) [63].
Scheme 6: Synthesis of ascididemin (42) [65].
Scheme 7: Synthesis of subarine (37) [66,67].
Scheme 8: Synthesis of demethyldeoxyamphimedine (9) [68].
Scheme 9: Synthesis of pyridoacridine analogues related to ascididemin (42) [70].
Scheme 10: Synthesis of analogues of meridine (56) [71].
Scheme 11: Synthesis of bulky pyridoacridine as eilatin (58) [72].
Scheme 12: Synthesis of AK37 (59), analogue of kuanoniamine A (60) [73].
Figure 6: Biosynthesis pathway I [74].
Figure 7: Reaction illustrating catechol and kynuramine as possible biosynthetic precursors [75].
Figure 8: Biosynthesis pathway B deduced from the feeding experiment A using labelled precursors [76].
Figure 9: Proposed biosynthesis pathway [47].
Figure 10: 4H-Pyrido[2,3,4-kl]acridin-4-one as a cytotoxic pharmacophore.
Figure 11: 7H-Pyrido[2,3,4-kl]acridine as a cytotoxic pharmacophore.
Figure 12: 9H-Quinolino[4,3,2-de][1,10]phenanthrolin-9-one as a cytotoxic pharmacophore.
Figure 13: 8H-Benzo[b]pyrido[4,3,2-de][1,7]phenanthrolin-8-one as a cytotoxic pharmacophore.
Figure 14: Pyrido[4,3,2-mn]pyrrolo[3,2,1-de]acridine as a cytotoxic pharmacophore.
Figure 15: 9H-Pyrido[4,3,2-mn]thiazolo[4,5-b]acridin-9-one and 8H-pyrido[4,3,2-mn]thiazolo[4,5-b]acridine: cyt...
Figure 16: 9H-quinolino[4,3,2-de][1,10]phenanthrolin-9-one as an anti-mycobacterial pharmacophore.
Figure 17: 9H-Quinolino[4,3,2-de][1,10]phenanthrolin-9-one as an antibacterial pharmacophore.
Figure 18: Saturated and less saturated pyridine moieties as aspartyl inhibitor cores.
Figure 19: Iminobenzoquinone and acridone cores as intercalating and TOPO inhibitor motifs found in pyridoacri...
Tetrathiafulvalene-based azine ligands for anion and metal cation coordination
- Awatef Ayadi,
- Aziz El Alamy,
- Olivier Alévêque,
- Magali Allain,
- Nabil Zouari,
- Mohammed Bouachrine and
- Abdelkrim El-Ghayoury
Beilstein J. Org. Chem. 2015, 11, 1379–1391, doi:10.3762/bjoc.11.149
- summarized in Scheme 2. The reaction of 6-bromo-2-pyridinecarboxaldehyde or 5-bromo-2-pyridinecarboxaldehyde with one equivalent of TTF-SnMe3 under the Stille coupling conditions, using [Pd(PPh3)4] as catalyst in toluene, afforded the intermediates 6-([2,2’-bi(1,3-dithiolylidene)]-4-yl)picolinaldehyde (1
Graphical Abstract
Scheme 1: Multifunctional TTF-appended azine ligands.
Scheme 2: Synthetic scheme for TTF-based azine ligands L1 and L2.
Figure 1: Crystal structure of ligand L1 with atom numbering scheme (top) and a side view of the molecule (bo...
Figure 2: Partial crystal packing of ligand L1 with formation of head to tail dimers that stack along a-axis ...
Figure 3: Packing diagram of L1 showing the orientation of the columns of head to tail dimers.
Figure 4: UV–visible absorption spectra of ligands L1 and L2 (c 2.5 × 10−5 M in (dichloromethane/acetonitrile...
Figure 5: HOMO–LUMO Frontier orbitals representation for ligands L1 and L2.
Figure 6: Cyclic voltammograms of ligands L1 and L2 (2 × 10−5 M) in CH2Cl2/CH3CN (9:1, v/v) at 100 mV·s−1 on ...
Figure 7: UV–visible spectral changes of ligand L2 (2 × 10−5 M in CH2Cl2/CH3CN, 9/1) upon addition of TBAF.
Figure 8: 1H NMR spectra of ligand L2 (4·10−3 M in DMSO-d6) upon addition of successive aliquots of TBAF (DMS...
Figure 9: Crystal structure of complex 3 with atom numbering scheme (top) and a side view of the molecule (bo...
Figure 10: Pattern of intramolecular and intermolecular contacts in 3. Two molecules are linked by pairs of st...
Figure 11: Layered structure of complex 3 viewed along the a-axis. The dimers are linked together through hydr...
Thiazole-induced rigidification in substituted dithieno-tetrathiafulvalene: the effect of planarisation on charge transport properties
- Rupert G. D. Taylor,
- Joseph Cameron,
- Iain A. Wright,
- Neil Thomson,
- Olena Avramchenko,
- Alexander L. Kanibolotsky,
- Anto R. Inigo,
- Tell Tuttle and
- Peter J. Skabara
Beilstein J. Org. Chem. 2015, 11, 1148–1154, doi:10.3762/bjoc.11.129
- Physical-Organic Chemistry and Coal Chemistry, 02160 Kyiv, Ukraine 10.3762/bjoc.11.129 Abstract Two novel tetrathiafulvalene (TTF) containing compounds 1 and 2 have been synthesised via a four-fold Stille coupling between a tetrabromo-dithienoTTF 5 and stannylated thiophene 6 or thiazole 4. The optical
- limited charge transport between the needles in these films. Conclusion By successfully coupling the tetrabrominated dithienoTTF (5) with stannylated intermediates 4 and 6 (via a four-fold Stille coupling), we have presented a novel route to substituted dithienoTTFs that does not necessitate the need for
Graphical Abstract
Figure 1: Compounds 1–3.
Scheme 1: Synthesis of compound 4.
Scheme 2: Synthesis of compounds 1 and 2.
Figure 2: UV–vis absorption spectra of 10−5 M solutions of compounds 1 (black) and 2 (red) in dichloromethane....
Figure 3: Cyclic voltammograms showing the reduction (left) and oxidation (right) of compounds 1 (top) and 2 ...
Figure 4: Optimised structures of 1 (left), 2 (centre) and 3 (right).
Figure 5: Output characteristics of OFETs fabricated using compound 2 in CHCl3 with OTS (top) and PFBT/OTS (b...
Figure 6: AFM images of OFET devices fabricated using compound 2 in CHCl3 with OTS (left) and PFBT/OTS (right...
The Flögel-three-component reaction with dicarboxylic acids – an approach to bis(β-alkoxy-β-ketoenamides) for the synthesis of complex pyridine and pyrimidine derivatives
- Mrinal K. Bera,
- Moisés Domínguez,
- Paul Hommes and
- Hans-Ulrich Reissig
Beilstein J. Org. Chem. 2014, 10, 394–404, doi:10.3762/bjoc.10.37
- the range of 60–72%. Pyrid-4-yl nonaflates are excellent precursors for transition metal-catalyzed cross-coupling reactions [42][54][55][56][57][58], which was demonstrated here by the successful Suzuki coupling of bisnonaflate 19 with (E)-styrylboronic acid and the Stille coupling of 19 with 2
Graphical Abstract
Scheme 1: Flögel-three-component reaction of lithiated alkoxyallenes, nitriles and carboxylic acids providing...
Scheme 2: Synthesis of bis(β-ketoenamides) 13–15 by three-component reactions of lithiated methoxyallene 8 wi...
Scheme 3: Cyclocondensations of β-ketoenamides 13 and 14 to 4-hydroxypyridines 16, 18a and 18b, their subsequ...
Scheme 4: Cyclocondensations of β-ketoenamides 13–15 with ammonium acetate to bis(pyrimidine) derivatives 23a...
Scheme 5: Conversion of mono-pyrimidine derivative 24b into unsymmetrically substituted biphenylen-bridged py...
Scheme 6: Condensation of β-ketoenamides 14 and 20 with hydroxylamine hydrochloride to pyridine-N-oxides 28 a...
Scheme 7: Riley oxidation of bis(pyrimidine) derivative 23a and conversion of diol 32a into macrocycle 34.
Figure 1: Optimized geometries of (a) E-configured and (b) Z-configured macrocycle 34 at B3LYP/6-31G(d,p) lev...
Scheme 8: Dihydroxylation of the macrocyclic olefin 34 to diol 35 and subsequent esterification to the bis-(R...
Recent applications of the divinylcyclopropane–cycloheptadiene rearrangement in organic synthesis
- Sebastian Krüger and
- Tanja Gaich
Beilstein J. Org. Chem. 2014, 10, 163–193, doi:10.3762/bjoc.10.14
- was achieved using TBAF, followed by formation of a vinyl triflate and Stille coupling with tributyltin hydride. The oxidation state of the remaining ester was adjusted to the corresponding aldehyde, followed by a Lewis acid-catalyzed intramolecular inverse-electron-demand hetero-Diels–Alder reaction
Graphical Abstract
Scheme 1: Vogel’s first approach towards the divinylcyclopropane rearrangement [4] and characterization of cis-d...
Scheme 2: Transition states for the Cope rearrangement and the related DVCPR. Ts = transition state.
Scheme 3: Two possible mechanisms of trans-cis isomerizations of divinylcyclopropanes.
Scheme 4: Proposed biosynthesic pathway to ectocarpene (21), an inactive degradation product of a sexual pher...
Scheme 5: Proposed biosynthesis of occidenol (25) and related natural compounds.
Scheme 6: Gaich’s bioinspired system using the DVCPR to mimick the dimethylallyltryptophan synthase. DMAPP = ...
Scheme 7: Iguchi’s total synthesis of clavubicyclone, part 1.
Scheme 8: Iguchi’s total synthesis of clavubicyclone, part 2.
Scheme 9: Wender’s syntheses of the two pseudoguainanes confertin (50) and damsinic acid (51) and Pier’s appr...
Scheme 10: Overman’s total synthesis of scopadulcic acid B.
Scheme 11: Davies’ total syntheses of tremulenolide A and tremulenediol A.
Scheme 12: Davies formal [4 + 3] cycloaddition approach towards the formal synthesis of frondosin B.
Scheme 13: Davies and Sarpongs formal [4 + 3]-cycloaddition approach towards barekoxide (106) and barekol (107...
Scheme 14: Davies formal [4 + 3]-cycloaddition approach to 5-epi-vibsanin E (115) containing an intermediate c...
Scheme 15: Echavarren’s total synthesis of schisanwilsonene A (126) featuring an impressive gold-catalzed casc...
Scheme 16: Davies early example of a formal [4 + 3]-cycloaddition in alkaloids synthesis.
Scheme 17: Fukuyama’s total synthesis of gelsemine, part 1.
Scheme 18: Fukuyama’s total synthesis of gelsemine, featuring a divinylcyclopropane rearrangement, part 2.
Scheme 19: Kende’s total synthesis of isostemofoline, using a formal [4 + 3]-cycloaddition, including an inter...
Scheme 20: Danishefsky’s total synthesis of gelsemine, part 1.
Scheme 21: Danishefsky’s total synthesis of gelsemine, part 2.
Scheme 22: Fukuyama’s total synthesis of gelsemoxonine.
Scheme 23: Wender’s synthetic access to the core skeleton of tiglianes, daphnanes and ingenanes.
Scheme 24: Davies’ approach towards the core skeleton of CP-263,114 (212).
Scheme 25: Wood’s approach towards actinophyllic acid.
Scheme 26: Takeda’s approach towards the skeleton of the cyanthins, utilitizing the divinylcyclopropane rearra...
Scheme 27: Donaldson’s organoiron route towards the guianolide skeleton.
Scheme 28: Stoltz’s tandem Wolff/DVCPR rearrangement.
Scheme 29: Stephenson’s tandem photocatalysis/arylvinylcyclopropane rearrangement.
Scheme 30: Padwa’s rhodium cascade involving a DVCPR.
Scheme 31: Matsubara’s version of a DVCPR.
Scheme 32: Toste’s tandem gold-catalyzed Claisen-rearrangement/DVCPR.
Scheme 33: Ruthenium- and gold-catalyzed versions of tandem reactions involving a DVCPR.
Scheme 34: Tungsten, platinum and gold catalysed cycloisomerizations leading to a DVCPR.
Scheme 35: Reisman’s total synthesis of salvileucalin B, featuring an (undesired) vinylcyclopropyl carbaldehyd...
Scheme 36: Studies on the divinylepoxide rearrangement.
Scheme 37: Studies on the vinylcyclopropanecarbonyl rearrangement.
Scheme 38: Nitrogen-substituted variants of the divinylcyclopropane rearrangement.
An overview of the synthetic routes to the best selling drugs containing 6-membered heterocycles
- Marcus Baumann and
- Ian R. Baxendale
Beilstein J. Org. Chem. 2013, 9, 2265–2319, doi:10.3762/bjoc.9.265
- hydrolysis of the phosphoramidate directing group the resulting pyridone 1.93 is subjected to a sequence of chlorinations rendering a suitably functionalised coupling partner for a final Stille coupling to yield etoricoxib. Although the synthesis of etoricoxib as depicted in Scheme 17 very efficiently forms
Graphical Abstract
Scheme 1: Scaled industrial processes for the synthesis of simple pyridines.
Scheme 2: Synthesis of nicotinic acid from 2-methyl-5-ethylpyridine (1.11).
Scheme 3: Synthesis of 3-picoline and nicotinic acid.
Scheme 4: Synthesis of 3-picoline from 2-methylglutarodinitrile 1.19.
Scheme 5: Picoline-based synthesis of clarinex (no yields reported).
Scheme 6: Mode of action of proton-pump inhibitors and structures of the API’s.
Scheme 7: Hantzsch-like route towards the pyridine rings in common proton pump inhibitors.
Figure 1: Structures of rosiglitazone (1.40) and pioglitazone (1.41).
Scheme 8: Synthesis of rosiglitazone.
Scheme 9: Syntheses of 2-pyridones.
Scheme 10: Synthesis and mechanism of 2-pyrone from malic acid.
Scheme 11: Polymer-assisted synthesis of rosiglitazone.
Scheme 12: Synthesis of pioglitazone.
Scheme 13: Meerwein arylation reaction towards pioglitazone.
Scheme 14: Route towards pioglitazone utilising tyrosine.
Scheme 15: Route towards pioglitazone via Darzens ester formation.
Scheme 16: Syntheses of the thiazolidinedione moiety.
Scheme 17: Synthesis of etoricoxib utilising Negishi and Stille cross-coupling reactions.
Scheme 18: Synthesis of etoricoxib via vinamidinium condensation.
Figure 2: Structures of nalidixic acid, levofloxacin and moxifloxacin.
Scheme 19: Synthesis of moxifloxacin.
Scheme 20: Synthesis of (S,S)-2,8-diazabicyclo[4.3.0]nonane 1.105.
Scheme 21: Synthesis of levofloxacin.
Scheme 22: Alternative approach to the levofloxacin core 1.125.
Figure 3: Structures of nifedipine, amlodipine and clevidipine.
Scheme 23: Mg3N2-mediated synthesis of nifedipine.
Scheme 24: Synthesis of rac-amlodipine as besylate salt.
Scheme 25: Aza Diels–Alder approach towards amlodipine.
Scheme 26: Routes towards clevidipine.
Figure 4: Examples of piperidine containing drugs.
Figure 5: Discovery of tiagabine based on early leads.
Scheme 27: Synthetic sequences to tiagabine.
Figure 6: Structures of solifenacin (2.57) and muscarine (2.58).
Scheme 28: Enantioselective synthesis of solifenacin.
Figure 7: Structures of DPP-4 inhibitors of the gliptin-type.
Scheme 29: Formation of inactive diketopiperazines from cis-rotameric precursors.
Figure 8: Co-crystal structure of carmegliptin bound in the human DPP-4 active site (PDB 3kwf).
Scheme 30: Improved route to carmegliptin.
Figure 9: Structures of lamivudine and zidovudine.
Scheme 31: Typical routes accessing uracil, thymine and cytosine.
Scheme 32: Coupling between pyrimidones and riboses via the Vorbrüggen nucleosidation.
Scheme 33: Synthesis of lamivudine.
Scheme 34: Synthesis of raltegravir.
Scheme 35: Mechanistic studies on the formation of 3.22.
Figure 10: Structures of selected pyrimidine containing drugs.
Scheme 36: General preparation of pyrimidines and dihydropyrimidones.
Scheme 37: Synthesis of imatinib.
Scheme 38: Flow synthesis of imatinib.
Scheme 39: Syntheses of erlotinib.
Scheme 40: Synthesis of erlotinib proceeding via Dimroth rearrangement.
Scheme 41: Synthesis of lapatinib.
Scheme 42: Synthesis of rosuvastatin.
Scheme 43: Alternative preparation of the key aldehyde towards rosuvastatin.
Figure 11: Structure comparison between nicotinic acetylcholine receptor agonists.
Scheme 44: Syntheses of varenicline and its key building block 4.5.
Scheme 45: Synthetic access to eszopiclone and brimonidine via quinoxaline intermediates.
Figure 12: Bortezomib bound in an active site of the yeast 20S proteasome ([114], pdb 2F16).
Scheme 46: Asymmetric synthesis of bortezomib.
Figure 13: Structures of some prominent piperazine containing drugs.
Figure 14: Structural comparison between the core of aplaviroc (4.35) and a type-1 β-turn (4.36).
Scheme 47: Examplary synthesis of an aplaviroc analogue via the Ugi-MCR.
Scheme 48: Syntheses of azelastine (5.1).
Figure 15: Structures of captopril, enalapril and cilazapril.
Scheme 49: Synthesis of cilazapril.
Figure 16: Structures of lamotrigine, ceftriaxone and azapropazone.
Scheme 50: Synthesis of lamotrigine.
Scheme 51: Alternative synthesis of lamotrigine (no yields reported).
Figure 17: Structural comparison between imiquimod and the related adenosine nucleoside.
Scheme 52: Conventional synthesis of imiquimod (no yields reported).
Scheme 53: Synthesis of imiquimod.
Scheme 54: Synthesis of imiquimod via tetrazole formation (not all yields reported).
Figure 18: Structures of various anti HIV-medications.
Scheme 55: Synthesis of abacavir.
Figure 19: Structures of diazepam compared to modern replacements.
Scheme 56: Synthesis of ocinaplon.
Scheme 57: Access to zaleplon and indiplon.
Scheme 58: Different routes towards the required N-methylpyrazole 6.65 of sildenafil.
Scheme 59: Polymer-supported reagents in the synthesis of key aminopyrazole 6.72.
Scheme 60: Early synthetic route to sildenafil.
Scheme 61: Convergent preparations of sildenafil.
Figure 20: Comparison of the structures of sildenafil, tadalafil and vardenafil.
Scheme 62: Short route to imidazotriazinones.
Scheme 63: Alternative route towards vardenafils core imidazotriazinone (6.95).
Scheme 64: Bayer’s approach to the vardenafil core.
Scheme 65: Large scale synthesis of vardenafil.
Scheme 66: Mode of action of temozolomide (6.105) as methylating agent.
Scheme 67: Different routes to temozolomide.
Scheme 68: Safer route towards temozolomide.
Figure 21: Some unreported heterocyclic scaffolds in top market drugs.
Controlled synthesis of poly(3-hexylthiophene) in continuous flow
- Helga Seyler,
- Jegadesan Subbiah,
- David J. Jones,
- Andrew B. Holmes and
- Wallace W. H. Wong
Beilstein J. Org. Chem. 2013, 9, 1492–1500, doi:10.3762/bjoc.9.170
- Suzuki–Miyaura and Stille coupling [12]. In this study, the continuous-flow synthesis of P3HT is examined. Distinct from a recent report of P3HT synthesis in a droplet-based microreactor [20], development of the flow synthesis is described in detail and controlled polymerization of P3HT, both in terms of
Graphical Abstract
Scheme 1: (a) Preparation of thiophene Grignard monomer and synthesis of P3HT by Kumada catalyst transfer pol...
Figure 1: Plot of number-average molecular weight, Mn, versus monomer–catalyst ratio [M]0/[I]0 for batch and ...
Figure 2: MALDI mass spectrum of low-molecular-weight preparation (GPC, Mn = 6.2 kg/mol) of P3HT in continuou...
Figure 3: Plot of number-average molecular weight, Mn, versus monomer–catalyst ratio [M]0/[I]0 for batch and ...
Scheme 2: Schematic representation of the telescoped preparation of P3HT in a flow reactor.
Figure 4: 1H NMR (CDCl3, 500 MHz) spectra of P3HT samples prepared in (a) flow and (b) batch show comparable ...
Figure 5: (a) Schematic diagram of the photovoltaic device geometry and (b) J–V curves of BHJ solar cells wit...
Double N-arylation reaction of polyhalogenated 4,4’-bipyridines. Expedious synthesis of functionalized 2,7-diazacarbazoles
- Mohamed Abboud,
- Emmanuel Aubert and
- Victor Mamane
Beilstein J. Org. Chem. 2012, 8, 253–258, doi:10.3762/bjoc.8.26
- 2,7-diazacarbazole 3a showed a rather low reactivity of the C–Cl bonds in the 3- and 6-positions. Indeed, the Stille coupling [42] of 3a with 2-tributylstannylpyridine (8) afforded a mixture of mono- and di-functionalized compounds 9a and 9b in 40% and 33% yields, respectively. The Suzuki coupling [43
Graphical Abstract
Scheme 1: Cross-coupling reactions of bipyridines 2.
Scheme 2: Ligand effect in the double N-arylation of 2a with 6a.
Figure 1: Unsuccessful substrates in the double N-arylation of 2a.
Scheme 3: Functionalization of diazacarbazole 2a.
Scheme 4: Functionalized diazacarbazoles 12a–c from bipyridine 2b.
Figure 2: (a) ORTEP views showing the π–π (dashed lines) and selected C–H···π (dotted-dashed line) interactio...
Amines as key building blocks in Pd-assisted multicomponent processes
- Didier Bouyssi,
- Nuno Monteiro and
- Geneviève Balme
Beilstein J. Org. Chem. 2011, 7, 1387–1406, doi:10.3762/bjoc.7.163
- excellent yields (Scheme 8). Another strategy allowing access to pyridine derivatives was developed by Katsumura and coworkers. They showed that chiral 2,4-disubstituted 1,2,5,6-tetrahydropyridines 17 can be obtained through a one pot imine synthesis, Stille coupling, 6π-azaelectrocyclization and
Graphical Abstract
Scheme 1: Synthesis of substituted amides.
Scheme 2: Synthesis of ketocarbamates and imidazolones.
Scheme 3: Access to β-lactams.
Scheme 4: Access to β-lactams with increased structural diversity.
Scheme 5: Synthesis of imidazolinium salts.
Scheme 6: Access to the indenamine core.
Scheme 7: Synthesis of substituted tetrahydropyridines.
Scheme 8: Synthesis of more substituted tetrahydropyridines.
Scheme 9: Synthesis of chiral tetrahydropyridines.
Scheme 10: Preparation of α-aminonitrile by a catalyzed Strecker reaction.
Scheme 11: Synthesis of spiroacetals.
Scheme 12: Synthesis of masked 3-aminoindan-1-ones.
Scheme 13: Synthesis of homoallylic amines and α-aminoesters.
Scheme 14: Preparation of 1,2-dihydroisoquinolin-1-ylphosphonates.
Scheme 15: Pyrazole elaboration by cycloaddition of hydrazines with alkynones generated in situ.
Scheme 16: An alternative approach to pyrazoles involving hydrazine cycloaddition.
Scheme 17: Synthesis of pyrroles by cyclization of propargyl amines.
Scheme 18: Isoindolone and phthalazone synthesis by cyclization of acylhydrazides.
Scheme 19: Sultam synthesis by cyclization of sulfonamides.
Scheme 20: Synthesis of sulfonamides by aminosulfonylation of aryl iodides.
Scheme 21: Pyrrolidine synthesis by carbopalladation of allylamines.
Scheme 22: Synthesis of indoles through a sequential C–C coupling/desilylation–coupling/cyclization reaction.
Scheme 23: Synthesis of indoles by a site selective Pd/C catalyzed cross-coupling approach.
Scheme 24: Synthesis of isoindolin-1-one derivatives through a sequential Sonogashira coupling/carbonylation/h...
Scheme 25: Synthesis of pyrroles through an allylic amination/Sonogashira coupling/hydroamination reaction.
Scheme 26: Synthesis of indoles through a Sonogashira coupling/cyclofunctionalization reaction.
Scheme 27: Synthesis of indoles through a one-pot two-step Sonogashira coupling/cyclofunctionalization reactio...
Scheme 28: Synthesis of α-alkynylindoles through a Pd-catalyzed Sonogashira/double C–N coupling reaction.
Scheme 29: Synthesis of indoles through a Pd-catalyzed sequential alkenyl amination/C-arylation/N-arylation.
Scheme 30: Synthesis of N-aryl-2-benzylpyrrolidines through a sequential N-arylation/carboamination reaction.
Scheme 31: Synthesis of phenothiazine derivatives through a one-pot palladium-catalyzed double C–N arylation i...
Scheme 32: Synthesis of substituted imidazolidinones through a palladium-catalyzed three-component reaction of...
Scheme 33: Synthesis of 2,3-diarylated amines through a palladium-catalyzed four-component reaction involving ...
Scheme 34: Synthesis of rolipram involving a Pd-catalyzed three-component reaction.
Scheme 35: Synthesis of seven-membered ring lactams through a Pd-catalyzed amination/intramolecular cyclocarbo...
Synthesis, reactivity and biological activity of 5-alkoxymethyluracil analogues
- Lucie Brulikova and
- Jan Hlavac
Beilstein J. Org. Chem. 2011, 7, 678–698, doi:10.3762/bjoc.7.80
- '-deoxyuridine 128 was subjected to a Stille coupling reaction with tributyl(vinyl)tin using Pd(MeCN)2Cl2 as a catalyst (Scheme 23, reaction conditions 2). This coupling reaction was followed by the oxidation of the vinyl group of nucleoside 129 by OsO4 and acetylation of vicinal diol 130. After deprotection of
- ) was selectively methylated at the 2'-O atom and subsequently iodinated at position 5 with CAN-I2 in AcOH to give nucleoside 137 in 74% yield. Protection of 3',5'-diol 137 by TBDMS groups (quantitative) afforded nucleoside 138 which was subsequently subjected to a Stille coupling reaction with tributyl
Graphical Abstract
Figure 1: Investigated derivatives.
Figure 2: Modifications of uracil ring.
Figure 3: 5-(3,3,3-Trifluoro-1-methoxypropyl)-2'-deoxyuridine (1).
Scheme 1: Synthesis of 5-(3,3,3-trifluoro-1-methoxypropyl)-2'-deoxyuridine (1) and 5-(3,3,3-trifluoro-1-(2-pr...
Scheme 2: Synthesis of 5-(3,3,3-trifluoro-1-methoxyprop-1-yl)-5,6-dihydro-2'-deoxyuridine (8).
Scheme 3: Synthesis of 5-(methoxy-2-haloethyl)-2'-deoxyuridines 12 and 13.
Scheme 4: Synthesis of 5-(1-methoxy-2-iodoethyl) nucleosides 28–30.
Figure 4: [125I] radiolabelled 5-(1-methoxy-2-iodoethyl)-2'-deoxyuridine 31.
Scheme 5: Synthesis of 5-(1-alkoxy-2-iodoethyl) 34–36 and 5-(1-ethoxy-2,2-diiodoethyl)-2'-deoxyuridine (33).
Scheme 6: Synthesis of 5-(1-methoxy-2-iodoethyl)-3',5'-di-O-acetyl-2'-deoxyuridine (38) and 5-(1-ethoxy-2-iod...
Figure 5: 5-(1-Hydroxy(or ethoxy)-2-haloethyl)-3',5'-di-O-acetyl-2'-deoxyuridines 43–46.
Scheme 7: 5-(1-Methoxy-2,2-dihaloethyl)-2'-deoxyuridines 47–49.
Scheme 8: Synthesis of 5-[1-(2-haloethyl(or nitro)ethoxy)-2-iodoethyl]-2'-deoxyuridines 50–54.
Scheme 9: Synthesis of alkoxyuracil analogues 56–61.
Figure 6: 5-(Methoxy-2-haloethyl)uracils 62–64.
Scheme 10: Synthesis of perfluoro derivatives 70–74.
Scheme 11: Synthesis of 1-β-D-arabinofuranosyl-5-(1-methoxy-2-iodoethyl)uracil (79).
Scheme 12: Synthesis of 1-β-D-arabinofuranosyl-5-(2,2-dibromo-1-methoxyethyl)uracil 82 and uridine analogue 83....
Scheme 13: Synthesis of methoxy derivative 87.
Scheme 14: Synthesis of 5-(1-methoxy-2-azidoethyl)-2'-deoxyuridine (93).
Scheme 15: Synthesis of methoxyalkyl derivatives 96 and 97.
Scheme 16: Synthesis of 5-(1-methoxyethyl)-2'-deoxyuridine (100).
Scheme 17: Synthesis of 2'-deoxy-5-(1-methoxyethyl)-4'-thiouridine (104).
Figure 7: 5-(1-Butoxyethyl)uracil 105 and 5-(1-butoxyethyl)-2'-deoxyuridine (106).
Scheme 18: Synthesis of β- and α-anomer of 5-(1-ethoxy-2-methylprop-1-yl)-2'-deoxyuridine.
Scheme 19: Synthesis of 5-(1-acyloxyethyl)-1-(tetrahydrofuran-2-yl)uracils 117 and 118.
Scheme 20: Synthesis of 5-(1,2-diacetoxyethyl)-3',5'-di-O-acetyl-2'-deoxyuridine 120.
Scheme 21: Synthesis of 5-[alkoxy-(4-nitrophenyl)methyl]uracils 124.
Scheme 22: Synthesis of 5-[alkoxy-(4-nitrophenyl)methyl]uridines 126 and 127.
Scheme 23: Synthesis of phosphoramidite 134. Reaction conditions 1: (a) TBDMSCl, imidazole, pyridine, 33 h, 99...
Scheme 24: Synthesis of phosphoramidite 145. (a) B(OCH3)3, CH(OCH3)3, Na2CO3, MeOH, 150 °C; (b) I2, (0.6 equiv...
Figure 8: Oligonucleotide 146.
Scheme 25: Synthesis of phosphoramidite 150.
Figure 9: 2'-Deoxyuridine derivatives 151–154.
Scheme 26: Synthesis of 2'-deoxyuridine derivatives 151–152.
Scheme 27: Synthesis of 5-[3-(2'-deoxyuridin-5-yl)-1-methoxyprop-1-yl]-2'-deoxyuridine (163).
Scheme 28: Synthesis of “metallocenonucleosides” 164 and 167.
Scheme 29: Synthesis of 5-(2,4:3,5-di-O-benzylidene-D-pentahydroxypentyl)-2,4-di-tert-butoxy-pyrimidine 172 an...
Figure 10: α- and β-pseudouridine (174 and 175).
Figure 11: 5'-Modified pseudouridine 176 and secopseudouridines 177, 178.
Figure 12: Methoxy derivatives 12, 13 and 28.
Figure 13: 5-(1-Methoxy-2,2-dihaloethyl)-2'-deoxyuridines 47–49.
Figure 14: 5-(1-Methoxyethyl)-2'-deoxyuridine 100.
Figure 15: 2'-Deoxy-5-(1-methoxyethyl)-4'-thiouridine (104).
Figure 16: 5-(1-Methoxy-2-azidoethyl)-2'-deoxyuridine (93).
Figure 17: 5-[1-(2-Halo(or nitro)ethoxy-2-iodoethyl)]-2'-deoxyuridines 50–54.
Figure 18: 5-[Alkoxy-(4-nitrophenyl)-methyl] uracil analogues 124, 126 and 127.
Figure 19: Methoxyiodoethyl pyrimidine nucleoside 79.
Figure 20: 5-[alkoxy-(4-nitro-phenyl)-methyl]uridines 126 and 127.
Conjugated polymers containing diketopyrrolopyrrole units in the main chain
- Bernd Tieke,
- A. Raman Rabindranath,
- Kai Zhang and
- Yu Zhu
Beilstein J. Org. Chem. 2010, 6, 830–845, doi:10.3762/bjoc.6.92
- presented. DPP-based polymers The first DPP-based polymer was described by Yu et al. in 1993 [13]. Conjugated block copolymers containing phenylene, thienylene and N-alkyl substituted diphenyl DPP units in the main chain were synthesized by Stille coupling. Photorefractive polymers were prepared containing
- number of studies were reported on synthesis, optical, electrochemical, and electroluminescent properties of conjugated DPP polymers. The polymers were prepared by Suzuki, Heck, and Stille coupling and other catalytic polycondensation reactions. Typical examples are shown in Scheme 2. Rabindranath et al
- polymers retaining their solution fluorescence characteristics. This enabled photopatterning of light-emitting structures for application in UV-down-conversion, waveguiding, and laser media. Using Stille coupling, Zhu et al. [36] first succeeded in the synthesis of copolymers P-9 to P-11 containing
Graphical Abstract
Figure 1: Structure of 3,6-diphenyl-substituted 2,5-diketopyrrolo[3,4-c]pyrrole (DPP).
Scheme 1: Synthesis of DPP monomers.
Figure 2: Plot of current density and light intensity versus voltage of polymer light-emitting diode containi...
Scheme 2: Pd-catalyzed coupling reactions for preparation of DPP-containing polymers.
Figure 3: Optical properties of some diphenylDPP-based conjugated polymers.
Figure 4: Optical properties of copolymers P-21 and P-22 based on two isomeric diphenylDPP monomer units (fro...
Figure 5: Absorption spectroelectrochemical plots of P-25 and P-26 as thin films on ITO glass. Scan rate: 100...
Scheme 3: Thiophenyl-DPP-based polymers.
Synthesis and Diels–Alder cycloaddition reaction of norbornadiene and benzonorbornadiene dimers
- Bilal Nişancı,
- Erdin Dalkılıç,
- Murat Güney and
- Arif Daştan
Beilstein J. Org. Chem. 2009, 5, No. 39, doi:10.3762/bjoc.5.39
- cycloaddition reaction of dimers with TCNE and PTAD was investigated and new norbornenoid polycyclics were obtained. All compounds were characterized properly using NMR spectroscopy. Keywords: benzonorbornadiene; Diels–Alder reaction; norbornadiene; Stille coupling; Introduction Norbornadiene (1) and related
Graphical Abstract
Scheme 1: Synthesis of starting materials 4 and 5.
Scheme 2: Synthesis and Diels–Alder cycloaddition reactions of dimers 7 and 8.
Scheme 3: Synthesis and Diels–Alder cycloaddition reactions of dimers 16 and 17.
Figure 1: Numbering of carbon atoms and description of possible structures for dimers 11–14 and 18–21.
