Enantiomerically pure P-chiral dicyclohexylammonium 2-(phosphinyl)acrylates as new Michael acceptors. Enantioselective synthesis of α-methylene-δ-valerolactones
摘要:
A convenient method for the preparation of enantiomerically pure P-chiral dicyclohexylammonium 2-(phosphinyl)acrylates 6 and 7 is presented. The synthesis of alpha-methylene-delta-valerolactone 5a with enantiomeric excesses of 85% and 80% has been developed. The key step of the synthesis. involves an asymmetric Michael addition of imine 10 to acrylates 6 and 7, respectively. (c) 2006 Elsevier Ltd. All rights reserved.
[EN] INDOLE CARBOXAMIDE DERIVATIVES AND USES THEREOF<br/>[FR] DÉRIVÉS D'INDOLE CARBOXAMIDE ET LEURS UTILISATIONS
申请人:NOVARTIS AG
公开号:WO2014037900A1
公开(公告)日:2014-03-13
A compound of Formula (I) is provided that has been shown to be useful for treating a disease, disorder or syndrome that is mediated by the transportation of essential molecules in the mmpL3 pathway: (I) wherein R1, R2, R3, R4, R5 and R6 are as defined herein.
Reaction of Cyclohexanone Benzylimines with Ethylidenemalonate Diesters. Diphenyl 2-Ethylidenemalonate: A Highly Electrophilic Synthetic Equivalent of Crotonic Esters
Michael alkylation of alpha-substituted and alpha,alpha'-disubstituted cyclohexanone benzylimines with ethylidenemalonate diesters was carried out for mechanistic and synthetic purposes. In the first case, an inverse regioselectivity occurred in comparison with what is generally observed since the Michael adducts resulted from alkylation of the non substituted enamine tautomer. With alpha,alpha'-disubstituted
Evaluating dynamic kinetic resolution strategies in the asymmetric hydrosilylation of cyclic ketimines
作者:Simon Jones、Peichao Zhao
DOI:10.1016/j.tetasy.2013.11.006
日期:2014.2
Attempts at performing dynamic kinetic resolution on a series of cyclic ketimines by making use of an asymmetric organocatalysed hydrosilylation gave modest conversion and moderate to good enantioselectivities. In the case of alpha-tetralone derivatives, the use of an N-benzyl protecting group was found to be crucial in obtaining enhanced levels of selectivity. (C) 2013 Elsevier Ltd. All rights reserved.
Oliveros, Esther; Riviere, Monique; Lattes, Armand, Journal of Heterocyclic Chemistry, 1980, vol. 17, # 1, p. 107 - 112