Search results

Search for "cascade" in Full Text gives 395 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.

Asymmetric organocatalytic synthesis of chiral homoallylic amines

  • Nikolay S. Kondratyev and
  • Andrei V. Malkov

Beilstein J. Org. Chem. 2024, 20, 2349–2377, doi:10.3762/bjoc.20.201

Graphical Abstract
  • ]-rearrangement of ene-aldimines 149, catalysed by the BINOL-derived chiral phosphoric acid (CPA) (R)-151 (Scheme 31) [46]. DFT computational analysis suggested that the reaction proceeds via a complex cascade that involves the fragmentation of ene-aldimine 149 to form an imine methylene cation, which in turn
PDF
Album
Review
Published 16 Sep 2024

Catalysing (organo-)catalysis: Trends in the application of machine learning to enantioselective organocatalysis

  • Stefan P. Schmid,
  • Leon Schlosser,
  • Frank Glorius and
  • Kjell Jorner

Beilstein J. Org. Chem. 2024, 20, 2280–2304, doi:10.3762/bjoc.20.196

Graphical Abstract
  • [107] (Figure 11B). Werth and Sigman [127] investigated multiple nucleophilic additions to nitroalkenes, catalysed by bifunctional hydrogen bond donors, observing good correlations to new bi-functional donors, new nucleophiles, new electrophiles and even similar cascade-type reactions. In the authors
PDF
Album
Review
Published 10 Sep 2024

Efficacy of radical reactions of isocyanides with heteroatom radicals in organic synthesis

  • Akiya Ogawa and
  • Yuki Yamamoto

Beilstein J. Org. Chem. 2024, 20, 2114–2128, doi:10.3762/bjoc.20.182

Graphical Abstract
  • (R = EWG-C6H4, E = PhS and PhTe) in moderate to high yields [30]. Very few examples of intermolecular cascade reactions with imidoyl radicals as key intermediates have been reported. The intermolecular cascade reaction of diselenide, electron-deficient acetylene, and isocyanide under photoirradiation
  • quinoxaline synthesis was reported to proceed by irradiation with visible light in the presence of dibenzylamine ((PhCH2)2NH, MeCN, rt, blue LED) [64]. This reaction involves a visible-light-induced single electron transfer (SET) process. An efficient radical cascade cyclization has also been reported, in
PDF
Album
Perspective
Published 26 Aug 2024

From perfluoroalkyl aryl sulfoxides to ortho thioethers

  • Yang Li,
  • Guillaume Dagousset,
  • Emmanuel Magnier and
  • Bruce Pégot

Beilstein J. Org. Chem. 2024, 20, 2108–2113, doi:10.3762/bjoc.20.181

Graphical Abstract
  • study, many research groups described a strategy for ortho-C–H functionalization of aryl sulfoxides with various nucleophiles via a cascade reaction of interrupted Pummerer reaction/sigmatropic rearrangement (Scheme 1a) [6][7][8][9][10][11]. A large range of nucleophiles, such as phenols [12][13][14][15
PDF
Album
Supp Info
Full Research Paper
Published 23 Aug 2024

Diastereoselective synthesis of highly substituted cyclohexanones and tetrahydrochromene-4-ones via conjugate addition of curcumins to arylidenemalonates

  • Deepa Nair,
  • Abhishek Tiwari,
  • Banamali Laha and
  • Irishi N. N. Namboothiri

Beilstein J. Org. Chem. 2024, 20, 2016–2023, doi:10.3762/bjoc.20.177

Graphical Abstract
  • Deepa Nair Abhishek Tiwari Banamali Laha Irishi N. N. Namboothiri Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400 076, India 10.3762/bjoc.20.177 Abstract A cascade inter–intramolecular double Michael strategy for the synthesis of highly functionalized cyclohexanones
  • treatment of Alzheimer's disease [3][4]. Likewise, RL91 and BHMPC are active for selective cell growth inhibition of the resistant lines (Figure 1) [5][6]. Their synthesis mainly involves a cascade Michael–aldol reaction between enones and suitable Michael donors such as β-ketosulfones, β-diketones, or
  • starting materials for cascade/domino reactions. Curcumin is the key component present in turmeric and is responsible for its various biological activities. Turmeric has been used in many forms for potential health benefits and as a traditional spice for centuries [11]. Curcumin exhibits diverse biological
PDF
Album
Supp Info
Full Research Paper
Published 15 Aug 2024

Solvent-dependent chemoselective synthesis of different isoquinolinones mediated by the hypervalent iodine(III) reagent PISA

  • Ze-Nan Hu,
  • Yan-Hui Wang,
  • Jia-Bing Wu,
  • Ze Chen,
  • Dou Hong and
  • Chi Zhang

Beilstein J. Org. Chem. 2024, 20, 1914–1921, doi:10.3762/bjoc.20.167

Graphical Abstract
  • –intramolecular cyclization cascade with excellent chemoselectivity in aqueous CH3CN [25]. Herein, as part of our continuing studies of heterocyclic scaffold synthesis mediated by hypervalent iodine reagents, we present the solvent-dependent chemoselective synthesis of a series of isoquinolinones mediated by PISA
PDF
Album
Supp Info
Full Research Paper
Published 07 Aug 2024

The Groebke–Blackburn–Bienaymé reaction in its maturity: innovation and improvements since its 21st birthday (2019–2023)

  • Cristina Martini,
  • Muhammad Idham Darussalam Mardjan and
  • Andrea Basso

Beilstein J. Org. Chem. 2024, 20, 1839–1879, doi:10.3762/bjoc.20.162

Graphical Abstract
  • approach offers several advantages since multiple bond formation, synthetic transformation and heterocyclic construction can be conducted in a single reactor [56]. Novel scaffolds derived from the GBB products have been successfully constructed through three types of one-pot synthesis, namely cascade
  • /domino reaction, one-pot stepwise synthesis and multicomponent reaction. In the one-pot cascade reaction, the complexity of heterocycles was achieved due to the presence of functional groups formed in the GBB reaction which allow further reactions to occur. In the case of one-pot stepwise synthesis, the
  • Ganesher [57] reported the one-pot cascade synthesis of indole-imidazo[1,2,a]pyridine hybrids 61 (Scheme 23). In this study, the convertible isocyanide 1-isocyano-2-(2,2-dimethoxyethyl)benzene (59, Kobayashi–Wessjohann isocyanide) was utilized as one of the precursors in the GBB reaction. The acetal
PDF
Album
Review
Published 01 Aug 2024

Ugi bisamides based on pyrrolyl-β-chlorovinylaldehyde and their unusual transformations

  • Alexander V. Tsygankov,
  • Vladyslav O. Vereshchak,
  • Tetiana O. Savluk,
  • Serhiy M. Desenko,
  • Valeriia V. Ananieva,
  • Oleksandr V. Buravov,
  • Yana I. Sakhno,
  • Svitlana V. Shishkina and
  • Valentyn A. Chebanov

Beilstein J. Org. Chem. 2024, 20, 1773–1784, doi:10.3762/bjoc.20.156

Graphical Abstract
  • of Ugi bisamides based on pyrrole-containing β-chlorovinylaldehyde and convertible isocyanides. The subsequent post-transformation of the products by acidic hydrolysis conditions should then lead to an acidic component. However, due to the cascade nature of the multicomponent processes and the
PDF
Album
Supp Info
Full Research Paper
Published 26 Jul 2024

Syntheses and medicinal chemistry of spiro heterocyclic steroids

  • Laura L. Romero-Hernández,
  • Ana Isabel Ahuja-Casarín,
  • Penélope Merino-Montiel,
  • Sara Montiel-Smith,
  • José Luis Vega-Báez and
  • Jesús Sandoval-Ramírez

Beilstein J. Org. Chem. 2024, 20, 1713–1745, doi:10.3762/bjoc.20.152

Graphical Abstract
  • reported the formation of an α,α-dicyanoalkene from dehydroepiandrosterone (DHEA) and its efficient transformation to dienamides 15 in a single step via a cascade reaction [15][16]. The construction of the β-lactam ring involved a cascade 4-endo N-cyclization/aerobic oxidation sequence in presence of
PDF
Album
Review
Published 24 Jul 2024

Chemo-enzymatic total synthesis: current approaches toward the integration of chemical and enzymatic transformations

  • Ryo Tanifuji and
  • Hiroki Oguri

Beilstein J. Org. Chem. 2024, 20, 1693–1712, doi:10.3762/bjoc.20.151

Graphical Abstract
  • pathways are described with a focus on the biosynthetic intermediates and enzymatic transformations that enable cascade reactions and pinpoint modifications. This focus highlights how these biosynthetic pathways are applicable to the development of streamlined chemo-enzymatic synthesis processes. The
  • (Scheme 7 and Scheme 8) [68]. This chemo-enzymatic total synthesis represents a pioneering approach, as it ingeniously integrates biosynthetic intermediate mimics, synthesized through multiple steps, into the biosynthetic pathway. A cascade of stereoselective carbon chain elongation and regioselective
  • JuvEV, homologous enzymes to TylGIV and TylGV (Scheme 8) [68]. Reconstruction of the JuvEIV–JuvEV-catalyzed cascade enzymatic conversions successfully furnished 4 in one pot from chemically synthesized thioester 77 mimicking biosynthetic intermediate 64. For the chemical synthesis of mimic 77, the left
PDF
Album
Review
Published 23 Jul 2024

Synthesis of substituted triazole–pyrazole hybrids using triazenylpyrazole precursors

  • Simone Gräßle,
  • Laura Holzhauer,
  • Nicolai Wippert,
  • Olaf Fuhr,
  • Martin Nieger,
  • Nicole Jung and
  • Stefan Bräse

Beilstein J. Org. Chem. 2024, 20, 1396–1404, doi:10.3762/bjoc.20.121

Graphical Abstract
  • accessed from the respective amines or organohalides (5 and 6, Scheme 1) [14][16][17][18]. Few examples of triazole–pyrazole hybrids, such as 13, have also been synthesized through a modified Sakai reaction [19], a reaction cascade involving the elimination of an azole [20] or in the n-butyllithium
PDF
Album
Supp Info
Full Research Paper
Published 20 Jun 2024

Synthetic applications of the Cannizzaro reaction

  • Bhaskar Chatterjee,
  • Dhananjoy Mondal and
  • Smritilekha Bera

Beilstein J. Org. Chem. 2024, 20, 1376–1395, doi:10.3762/bjoc.20.120

Graphical Abstract
  • intramolecular Cannizzaro reaction while accomplishing the synthesis of the bicyclic core structure of proposed ottelione A (47) [85]. Commencing from the Diels–Alder adduct 48, an enzymatic desymmetrization of the reduced diol 49 formed the enantiopure 50 (ee >99%). A cascade of reaction sequences delivered the
  • scaffolds Burroughs et al. developed an intramolecular Cannizzaro-based cascade synthesis for the construction of 8-membered cycloocta-2,5-dienones [91]. The initial formation of the organolithium species 82 formed by acetylide addition to the ortho-substituted bromoaldehyde 81, was subjected to halogen
PDF
Album
Review
Published 19 Jun 2024
Graphical Abstract
  • bisepoxyisoindole-7-carboxylic acids were obtained in good yields after a practical isolation procedure. The results obtained in this study demonstrate the potential of vegetable oils and their renewable materials to provide a reaction medium that is more sustainable than conventional organic solvents in cascade
  • ][98]. Therefore, in the present study, we report for the first time a milder, greener strategy to prepare a series of epoxyisoindolinones from aminofuranes and maleic anhydride via cascade amidation and stereocontrolled IMDAF reaction in bio-based solvents as an alternative reaction medium. Results
PDF
Album
Supp Info
Full Research Paper
Published 06 Jun 2024

Domino reactions of chromones with activated carbonyl compounds

  • Peter Langer

Beilstein J. Org. Chem. 2024, 20, 1256–1269, doi:10.3762/bjoc.20.108

Graphical Abstract
  • of the substituent located at carbon C3 of the chromone moiety and also on the type of nucleophile employed. Keywords: cyclizations; 1,3-dicarbonyl compounds; domino reactions; heterocycles; regioselectivity; silyl enol ethers; Introduction Domino reactions (also called cascade or tandem reactions
PDF
Album
Review
Published 29 May 2024

Cofactor-independent C–C bond cleavage reactions catalyzed by the AlpJ family of oxygenases in atypical angucycline biosynthesis

  • Jinmin Gao,
  • Liyuan Li,
  • Shijie Shen,
  • Guomin Ai,
  • Bin Wang,
  • Fang Guo,
  • Tongjian Yang,
  • Hui Han,
  • Zhengren Xu,
  • Guohui Pan and
  • Keqiang Fan

Beilstein J. Org. Chem. 2024, 20, 1198–1206, doi:10.3762/bjoc.20.102

Graphical Abstract
  • the stable CM• radical through electron paramagnetic resonance. Based on previous studies of cofactor-independent oxygenases and our results, we propose a radical-mediated catalytic mechanism for the cofactor-independent AlpJ-family oxygenases (Scheme 2). The catalytic cascade was initiated by
PDF
Album
Supp Info
Full Research Paper
Published 23 May 2024

Manganese-catalyzed C–C and C–N bond formation with alcohols via borrowing hydrogen or hydrogen auto-transfer

  • Mohd Farhan Ansari,
  • Atul Kumar Maurya,
  • Abhishek Kumar and
  • Saravanakumar Elangovan

Beilstein J. Org. Chem. 2024, 20, 1111–1166, doi:10.3762/bjoc.20.98

Graphical Abstract
  • ). The reaction proceeded via the dehydrogenation of the alcohol, aldol condensation, and hydrogenation of α,β-unsaturated ketones. In 2019, Leitner and his group introduced an outstanding cascade BH approach for the synthesis of various substituted cycloalkanes by coupling diols and secondary alcohols
PDF
Album
Review
Published 21 May 2024

Carbonylative synthesis and functionalization of indoles

  • Alex De Salvo,
  • Raffaella Mancuso and
  • Xiao-Feng Wu

Beilstein J. Org. Chem. 2024, 20, 973–1000, doi:10.3762/bjoc.20.87

Graphical Abstract
  • derivatives were isolated with good yields (Scheme 1). Instead, in the Senadi et al. approach, 1-(3-amino)-1H-indol-2-yl)-1-ketones were obtained through a Pd(0)-catalyzed cascade process consisting of isonitrile insertion as carbon monoxide surrogate and a C–H cross-coupling [13]. The reaction took place in
PDF
Album
Review
Published 30 Apr 2024

Ortho-ester-substituted diaryliodonium salts enabled regioselective arylocyclization of naphthols toward 3,4-benzocoumarins

  • Ke Jiang,
  • Cheng Pan,
  • Limin Wang,
  • Hao-Yang Wang and
  • Jianwei Han

Beilstein J. Org. Chem. 2024, 20, 841–851, doi:10.3762/bjoc.20.76

Graphical Abstract
  • for the synthesis of functional materials via cross-coupling reactions. Next, we extended our investigation to 1-naphthol in this reaction, and found that the arylation of 1-naphthol was achieved selectively at the C-2 position. The cascade cyclization resulted in the corresponding products 3an and
  • diaryliodonium salts in a cascade cyclization, the cyclization features a copper-catalyzed activation strategy involving the cleavage of the C–I bond and esterification. The resulting cascade of selective arylation/intramolecular cyclization facilitated the synthesis of 3,4-benzocoumarin derivatives. The
PDF
Album
Supp Info
Letter
Published 18 Apr 2024

Evaluation of the enantioselectivity of new chiral ligands based on imidazolidin-4-one derivatives

  • Jan Bartáček,
  • Karel Chlumský,
  • Jan Mrkvička,
  • Lucie Paloušová,
  • Miloš Sedlák and
  • Pavel Drabina

Beilstein J. Org. Chem. 2024, 20, 684–691, doi:10.3762/bjoc.20.62

Graphical Abstract
  • -tetrazole, which was successfully used in many asymmetric reactions via “enamine activation”, especially in asymmetric aldol reactions [20][21][22][23]. Moreover, compound IV was previously included in a study dealing with asymmetric cascade reactions (based on aldol reactions) of aldehydes with α-keto
PDF
Album
Supp Info
Full Research Paper
Published 02 Apr 2024

Recent developments in the engineered biosynthesis of fungal meroterpenoids

  • Zhiyang Quan and
  • Takayoshi Awakawa

Beilstein J. Org. Chem. 2024, 20, 578–588, doi:10.3762/bjoc.20.50

Graphical Abstract
  • cyclization process is initiated by the protonation of the epoxide, leading to the formation of a cation at C-7. A cascade of migrations then occurs to form the final backbone: H-6 migrates to the cation C-7, the methyl group at C-13 shifts to C-6, H-10 migrates to C-11, and finally, deprotonation of the
PDF
Album
Review
Published 13 Mar 2024

Entry to new spiroheterocycles via tandem Rh(II)-catalyzed O–H insertion/base-promoted cyclization involving diazoarylidene succinimides

  • Alexander Yanovich,
  • Anastasia Vepreva,
  • Ksenia Malkova,
  • Grigory Kantin and
  • Dmitry Dar’in

Beilstein J. Org. Chem. 2024, 20, 561–569, doi:10.3762/bjoc.20.48

Graphical Abstract
  • synthesis of spiro-annulated pyrrolidine-2,5-diones by catalyzed spirocyclizations involving aldehydes [11], tetrahydrofuran [12][13], and in the O–H insertion/Claisen rearrangement/intramolecular oxa-Michael addition cascade [14] (Scheme 1). Herein, we report our findings obtained, while investigating the
PDF
Album
Supp Info
Full Research Paper
Published 11 Mar 2024

(E,Z)-1,1,1,4,4,4-Hexafluorobut-2-enes: hydrofluoroolefins halogenation/dehydrohalogenation cascade to reach new fluorinated allene

  • Nataliia V. Kirij,
  • Andrey A. Filatov,
  • Yurii L. Yagupolskii,
  • Sheng Peng and
  • Lee Sprague

Beilstein J. Org. Chem. 2024, 20, 452–459, doi:10.3762/bjoc.20.40

Graphical Abstract
PDF
Album
Supp Info
Full Research Paper
Published 27 Feb 2024

Mechanisms for radical reactions initiating from N-hydroxyphthalimide esters

  • Carlos R. Azpilcueta-Nicolas and
  • Jean-Philip Lumb

Beilstein J. Org. Chem. 2024, 20, 346–378, doi:10.3762/bjoc.20.35

Graphical Abstract
  • conditions, affording product 61 [60]. On the other hand, reaction with 1,7-enyne 62 affords dihydroquinolinone product 63 via a cascade radical addition/cyclization process [61]. In both transformations, HE serves a dual role by activating the NHPI ester through EDA complex formation and providing a
  • hydrogen atom to terminate the radical reaction. The proposed mechanism of the hydroalkylation cascade is depicted in Scheme 13B. Upon excitation of complex 59 with blue light, intra-complex SET takes place from the HE to the NHPI ester, leading to the formation of tert-butyl radical 64 and radical cation
PDF
Album
Perspective
Published 21 Feb 2024

Catalytic multi-step domino and one-pot reactions

  • Svetlana B. Tsogoeva

Beilstein J. Org. Chem. 2024, 20, 254–256, doi:10.3762/bjoc.20.25

Graphical Abstract
  • in the Full Research Paper by Nath and co-workers. The newly synthesized porphyrin derivatives displayed significant red-shifted absorption and emission compared to simple meso-tetraarylporphyrins [14]. The Carlone group reports an Enders-type triple cascade reaction toward cyclohexenals, using
PDF
Album
Editorial
Published 08 Feb 2024

Copper-catalyzed multicomponent reaction of β-trifluoromethyl β-diazo esters enabling the synthesis of β-trifluoromethyl N,N-diacyl-β-amino esters

  • Youlong Du,
  • Haibo Mei,
  • Ata Makarem,
  • Ramin Javahershenas,
  • Vadim A. Soloshonok and
  • Jianlin Han

Beilstein J. Org. Chem. 2024, 20, 212–219, doi:10.3762/bjoc.20.21

Graphical Abstract
  • example, Wan and co-workers developed a cascade reaction of α-diazo esters, nitriles, and carboxylic acids via the generation of nitrile ylides and Mumm rearrangement affording unsymmetric diacyl α-amino acid esters as products (Scheme 1a) [39]. In 2017, Zhang, Hu, and co-workers developed a Cu-catalyzed
  • . Conclusion In summary, a series of new β-trifluoromethyl β-diazo esters have been designed, which are applied for the first time in a cascade reaction through an interrupted esterification with nitrile ylides as the key intermediates under copper-catalysis conditions. Varieties of unsymmetric trifluoromethyl
PDF
Album
Supp Info
Letter
Published 02 Feb 2024
Other Beilstein-Institut Open Science Activities