Asymmetric Construction of Remote Vicinal Quaternary and Tertiary Stereocenters via Direct Doubly Vinylogous Michael Addition
作者:Subhrajit Rout、Harshit Joshi、Vinod K. Singh
DOI:10.1021/acs.orglett.8b00493
日期:2018.4.20
An asymmetric direct doubly vinylogousMichaeladdition has been developed for the generation of sterically congested vicinal quaternary and tertiary stereocenters. This doubly vinylogousMichaeladdition of β,γ-unsaturated butenolides to 3-methyl-4-nitro-5-alkenyl isoxazoles, powered by a bifunctional squaramide, affords a broad range of densely functionalized enantioenriched γ,γ-disubstituted butenolides
[EN] PROCESS FOR THE PREPARATION OF GAMMA AMINO ACIDS AND INTERMEDIATES USED IN SAID PROCESS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE ACIDES AMINÉS GAMMA ET INTERMÉDIAIRES UTILISÉS DANS CE PROCÉDÉ
申请人:ROYAL COLLEGE OF SURGEONS IE
公开号:WO2013076225A1
公开(公告)日:2013-05-30
The invention relates to the preparation of gamma amino acids of formula (I) and pharmaceutically acceptable salts, solvates and prodrugs thereof, and to intermediates used for their preparation. (formula I) wherein R1 is selected from an alkyl group, an alkenyl group, an alkynyl group and a cycloalkyl group, each of which may be optionally substituted and * denotes a chiral centre. In particular, the present invention provides an efficient synthesis of (S)-pregabalin which is suitable for carrying out on an industrial scale.
PROCESS FOR THE PREPARATION OF GAMMA AMINO ACIDS AND INTERMEDIATES USED IN SAID PROCESS
申请人:Royal College of Surgeons in Ireland
公开号:US20140336412A1
公开(公告)日:2014-11-13
The invention relates to the preparation of gamma amino acids of formula (I) and pharmaceutically acceptable salts, solvates and prodrugs thereof, and to intermediates used for their preparation. (formula I) wherein R
1
is selected from an alkyl group, an alkenyl group, an alkynyl group and a cycloalkyl group, each of which may be optionally substituted and * denotes a chiral centre. In particular, the present invention provides an efficient synthesis of (S)-pregabalin which is suitable for carrying out on an industrial scale.