Facile preparation of fluorine-containing 2,3-epoxypropanoates and their epoxy ring-opening reactions with various nucleophiles

• Yutaro Miyashita,
• Sae Someya,
• Tomoko Kawasaki-Takasuka,
• Tomohiro Agou and
• Takashi Yamazaki

Beilstein J. Org. Chem. 2024, 20, 2421–2433, doi:10.3762/bjoc.20.206

• mainly afford 2-substituted 3-hydroxyesters usually in a highly anti selective manner. Keywords: α,β-unsaturated esters; epoxyesters; fluorine; Grignard-based cuprates; nucleophiles; Introduction Fluorine-containing compounds have been utilized in diverse fields due to their special character

• reactivity of the CF3-containing ethyl 2,3-epoxybutanoate 2a towards a variety of organometallic species [27][28][29], because relatively readily accessible Grignard-based cuprates were not involved, their applicability to 2b as the representative partner was investigated here (Table 5). The 1:2 ratio of CuI

• ) Grignard-based cuprates. These processes usually yielded the addition products along with the epoxy ring opening at the 2 position via the SN2 mechanism, affording 3-Rf-3-hydroxyesters with the incorporation of a variety of substituents at the 2-position in a highly anti-selective fashion. We believe that

Recent advances in Cu-catalyzed C(sp³)–Si and C(sp³)–B bond formation

• Balaram S. Takale,
• Ruchita R. Thakore,
• Elham Etemadi-Davan and
• Bruce H. Lipshutz

Beilstein J. Org. Chem. 2020, 16, 691–737, doi:10.3762/bjoc.16.67

• -additions of cuprates derived from a silyllithium [47] to α,β-unsaturated ketones [48]. There was no effort made at that time to convert these reactions to the corresponding catalytic processes, rather, the accent was more towards using the silyl group introduced as a hydroxy group equivalent [49][50][51

Copper-catalyzed enantioselective conjugate addition of organometallic reagents to challenging Michael acceptors

• Delphine Pichon,
• Jennifer Morvan,
• Christophe Crévisy and
• Marc Mauduit

Beilstein J. Org. Chem. 2020, 16, 212–232, doi:10.3762/bjoc.16.24

• and 89% ee with EtMgBr (Scheme 2b). To overcome the low regioselectivity, the authors took into account previous works showing that the 1,4-regioselectivity in the addition of cuprates to enals could be improved in the presence of a slight excess of TMSCl [15][16][17][18][19]. Indeed, using TMSCl in

Recent advances in copper-catalyzed asymmetric coupling reactions

• Fengtao Zhou and
• Qian Cai

Beilstein J. Org. Chem. 2015, 11, 2600–2615, doi:10.3762/bjoc.11.280

• (Scheme 12). Schreiber et al. [32] reported an efficient preparation of axially chiral unsymmetrical biaryl compounds in good to excellent diastereoselectivities by coupling through the formation of higher-order cuprates (Scheme 13). The utility of this strategy was also demonstrated by the

Copper-catalyzed asymmetric conjugate addition of organometallic reagents to extended Michael acceptors

• Thibault E. Schmid,
• Sammy Drissi-Amraoui,
• Christophe Crévisy,
• Olivier Baslé and
• Marc Mauduit

Beilstein J. Org. Chem. 2015, 11, 2418–2434, doi:10.3762/bjoc.11.263

• cuprates was investigated onto different Michael acceptors [7]. The reaction of dienones such as 6 (Miginiac) [8], enynones of the type 8 (Hulce) [9] or polarized enynes 10 (Krause) [10] consistently proceeded with a 1,6-selectivity, as compounds 7, 9 and 11 were respectively identified as the major

• reaction product. The selective 1,6-addition of cuprates onto extended Michael acceptors featuring a terminal C–C triple bond prompted research groups to investigate thoroughly the mechanism of this reaction [11][12][13]. Notably, the 1,6-conjugate additions onto Michael acceptors involving copper reagents

• extended unsaturated systems. Since the initial discoveries looking into the conjugate addition of cuprates to extended Michael acceptors, substantial research has been undertaken to develop efficient methodologies enabling such reactions in a regio- and enantioselective manner, with significant

Cu-catalyzed trifluoromethylation of aryl iodides with trifluoromethylzinc reagent prepared in situ from trifluoromethyl iodide

• Yuzo Nakamura,
• Motohiro Fujiu,
• Tatsuya Murase,
• Yoshimitsu Itoh,
• Hiroki Serizawa,
• Kohsuke Aikawa and
• Koichi Mikami

Beilstein J. Org. Chem. 2013, 9, 2404–2409, doi:10.3762/bjoc.9.277

• led to the formation of the trifluoromethyl coupling product 2a (−59.8 ppm) even in the absence of phen, involving the consumption of the cuprates [Cu(CF3)I] − and [Cu(CF3)2] −. The use of DMF as a solvent led to a gradual increase of the peak assigned as inactive [Cu(CF3)4] − during the course of the

An approach towards azafuranomycin analogs by gold-catalyzed cycloisomerization of allenes: synthesis of (αS,2R)-(2,5-dihydro-1H-pyrrol-2-yl)glycine

• Jörg Erdsack and
• Norbert Krause

Beilstein J. Org. Chem. 2013, 9, 1936–1942, doi:10.3762/bjoc.9.229

• ; amino acids; cuprates; furanomycin; gold catalysis; Introduction In 1967, Katagiri et al. reported the isolation of a novel antibiotic from the culture broth of the fungus Streptomyces threomyceticus [1]. The compound acts as a competitive antagonist for isoleucine in vitro and hampers the growth of

Preparation and ring-opening reactions of N-diphenylphosphinyl vinyl aziridines

• Ashley N. Jarvis,
• Andrew B. McLaren,
• Helen M. I. Osborn and
• Joseph Sweeney

Beilstein J. Org. Chem. 2013, 9, 852–859, doi:10.3762/bjoc.9.98

• , diethyl ether/light petroleum, 3:2, as an eluent). General procedures for the ring-opening reactions of N-diphenylphosphinyl vinyl aziridines Ring-opening reaction with lower-order cuprates: To dry CuI (5 equiv) in a flame-dried flask, under N2, was added diethyl ether (10 mL), and the suspension was

Highly stereocontrolled synthesis of trans-enediynes via carbocupration of fluoroalkylated diynes

• Tsutomu Konno,
• Misato Kishi and
• Takashi Ishihara

Beilstein J. Org. Chem. 2012, 8, 2207–2213, doi:10.3762/bjoc.8.249

• fluoroalkylated alkynes with cuprates proceeds in a highly cis-selective manner [30][31]), together with a slight recovery of the starting material (Table 3, entry 1). In this case, the reaction proceeded in a highly regio- and stereoselective manner and the other isomers 6–12 were not detected at all (Figure 2

• , iodine was employed as an electrophile instead of aqueous NH4Cl. The results are summarised in Table 4. As shown in Table 4, entries 1 and 2, (n-Bu)2CuLi·LiCN and Me2CuLi·LiCN could participate in the reaction to give the corresponding iodide 13a,b in good yields. Furthermore, the cuprates prepared from

• proposed reaction mechanism. Synthesis of trans-enediynes. aDetermind by 19F NMR. Values in parentheses are of isolated yield. Investigation of the reaction conditions. β-Elimination of various enynes. Investigation of the reaction conditions in carbocupration. Carbocupration with various cuprates

Recent advances in direct C–H arylation: Methodology, selectivity and mechanism in oxazole series

• Cécile Verrier,
• Pierrik Lassalas,
• Laure Théveau,
• Guy Quéguiner,
• François Trécourt,
• Francis Marsais and
• Christophe Hoarau

Beilstein J. Org. Chem. 2011, 7, 1584–1601, doi:10.3762/bjoc.7.187

• ], manganate ((Me3SiCH2)2Mn(TMP)Li·TMEDA) [3][8], cuprates (MeCu(TMP)(CN)Li2, (TMP)2CuLi) [9][10] and cadmium amides ((TMP)3CdLi) [11][12], for regio- and/or chemoselective deprotonative metalation of aromatics, producing arylmetal intermediates under smooth reaction conditions that are directly suitable for

Complete transfer of chirality in an intramolecular, thermal [2 + 2] cycloaddition of allene-ynes to form non-racemic spirooxindoles

• Kay M. Brummond and
• Joshua M. Osbourn

Beilstein J. Org. Chem. 2011, 7, 601–605, doi:10.3762/bjoc.7.70

• allenyloxindole 8 (Table 1). In order to generate the allene, we examined various leaving groups (OMs, OMe, OAc), solvents (THF, Et2O), and cuprates (lower and higher order cyanocuprates). The reaction incorporating a mesylate as a leaving group was problematic due to substrate instability issues, even at low

• temperatures (Table 1, entry 1) and the substrates containing –OMe and –OAc leaving groups were unreactive toward the lower order cuprates (Table 1, entries 2–5). The optimal conditions were found using the propargylic acetate and the higher order cuprate, t-Bu2Cu(CN)Li2 at −78 °C which gave compound 8 (R

Aromatic and heterocyclic perfluoroalkyl sulfides. Methods of preparation

• Vladimir N. Boiko

Beilstein J. Org. Chem. 2010, 6, 880–921, doi:10.3762/bjoc.6.88

Analogues of amphibian alkaloids: total synthesis of (5R,8S,8aS)-(−)-8-methyl- 5-pentyloctahydroindolizine (8-epi-indolizidine 209B) and [(1S,4R,9aS)-(−)-4-pentyloctahydro- 2H-quinolizin- 1-yl]methanol

• Joseph P. Michael,
• Claudia Accone,
• Charles B. de Koning and
• Christiaan W. van der Westhuyzen

Beilstein J. Org. Chem. 2008, 4, No. 5, doi:10.1186/1860-5397-4-5

• by a leaving group that can be displaced by organometallic reagents (e.g. cuprates) of appropriate chain length. Substituents at C-4 can also be varied by choosing appropriate analogues of the chiral amine 14, which should also be available in both enantiomeric forms by the Davies procedure [32

Allylsilanes in the synthesis of three to seven membered rings: the silylcuprate strategy

• Asunción Barbero,
• Francisco J. Pulido and
• M. Carmen Sañudo

Beilstein J. Org. Chem. 2007, 3, No. 16, doi:10.1186/1860-5397-3-16

• quenching with D2O undergoes deuterio-decupration introducing deuterium exclusively in the vinylic position C-2. As mentioned in the introduction, the use of lower order cuprates such as silylcyanocuprate 1 leads selectively to allylsilanes. Trapping of the intermediate vinylcuprate 2 with α,β-unsaturated

• . Intramolecular cyclization of TMS-epoxyallylsilanes. Spiro-cyclopropanation from oxoallylsilanes. Cyclobutane formation from hydroxy-functionalized allysilanes. Cyclobutene formation from vinyltin cuprates and epoxides. Silylcupration of 1,2-propadiene and reaction with α,β-unsaturated nitriles. Cycloheptane