Selective CS bond cleavage of a β-sultam ring was achieved by the reactions with Lewis acids. Aryl ketones or aldehyde were provided from 3-aryl-β-sultams whereas β-sultams bearing a poorly migratory substituent at C-3 gave trans-1,2,3-oxathiazolidine 2-oxides and/or cis-aziridines. These reactions were influenced by the cation-stabilizing capability of C-4 substituents and by the configuration of
Brønsted Acid-Catalyzed Tandem Pinacol-Type Rearrangement for the Synthesis of α-(3-Indolyl) Ketones by Using α-Hydroxy Aldehydes
作者:Samrat Kundu、Ankush Banerjee、Modhu Sudan Maji
DOI:10.1021/acs.joc.9b02474
日期:2019.12.20
A Brønsted acid-catalyzed pinacol-type rearrangement pathway is reported here to synthesize various substituted α-(3-indolyl) ketones by employing unprotected indoles and α-hydroxy aldehydes as coupling partners. Utilization of economic and readily available Brønsted acid catalyst and use of simple starting precursors exemplify the economic viability of this method. Under this developed protocol, selective
[EN] SUPPORTED CATALYST FOR ALDEHYDE COUPLING REACTION, METHOD FOR PERFORMING ALDEHYDE COUPLING REACTION, AND METHOD FOR REGENERATING SUPPORTED CATALYST FOR ALDEHYDE COUPLING REACTION<br/>[FR] CATALYSEUR SUPPORTÉ POUR RÉACTION DE COUPLAGE DE L'ALDÉHYDE, PROCÉDÉ POUR EFFECTUER LA RÉACTION DE COUPLAGE DE L'ALDÉHYDE ET PROCÉDÉ POUR RÉGÉNÉRER LE CATALYSEUR SUPPORTÉ POUR LA RÉACTION DE COUPLAGE DE L'ALDÉHYDE
申请人:SEKISUI CHEMICAL CO LTD
公开号:WO2016195115A1
公开(公告)日:2016-12-08
A supported catalyst for aldehyde coupling reaction, comprising a carrier having supported thereon a catalyst comprising at least one azolium compound selected from the group consisting of a thiazolium salt, an imidazolium salt, a benzimidazolium salt and a triazolium salt, the azolium compound having, at a nitrogen atom thereof, a substituent selected from the group consisting of an aliphatic group having 6 or more carbon atoms and an aromatic group having 6 or more carbon atoms.
Enantioselective Acyloin Rearrangement of Acyclic Aldehydes Catalyzed by Chiral Oxazaborolidinium Ion
作者:Soo Min Cho、Si Yeon Lee、Do Hyun Ryu
DOI:10.1021/acs.orglett.1c00314
日期:2021.2.19
A catalytic enantioselective acyloin rearrangement of acyclic aldehydes to synthesize highly optically active acyloin derivatives is described. In the presence of a chiral oxazaborolidinium ion catalyst, the reaction provided chiral α-hydroxy aryl ketones in high yield (up to 95%) and enantioselectivity (up to 98% ee). In addition, the enantioselective acyloin rearrangement of α,α-dialkyl-α-siloxy
[EN] PROCESS FOR PRODUCING ALPHA-HYDROXYKETONE COMPOUND<br/>[FR] PROCÉDÉ DE PRODUCTION D'UN COMPOSÉ D'ALPHA-HYDROXYCÉTONE
申请人:SUMITOMO CHEMICAL CO
公开号:WO2010041767A1
公开(公告)日:2010-04-15
A process for producing an α-hydroxyketone compound, which comprises subjecting an aldehyde compound to a coupling reaction in the presence of an alkoxyimidazolidine compound represented by the formula (1) wherein Rソ1? and Rソ2? independently represent a hydrogen atom, etc., Rソ3? and Rソ4? independently represent a substituted or unsubstituted aryl group, etc. and Rソ5? represents an alkyl group.