Diastereoselective Synthesis of β-Heteroaryl syn-α-Methyl-β-Amino Acid Derivatives via a Double Chiral Auxiliary Approach
摘要:
The addition of the SuperQuat enolate to five- and six-membered heterocyclic tert-butyl sulfinimines led to a high syn-selectivity of up to 99:1 in good to excellent yields. The reaction Is tentatively proposed to proceed through an open-chain transition state with the presence of an alpha-heteroatom on the sulfinimine leading to high diastereoselectivities. The adducts were derivatized to beta-amino esters and amides in a facile manner.
Diastereoselective Synthesis of β-Heteroaryl syn-α-Methyl-β-Amino Acid Derivatives via a Double Chiral Auxiliary Approach
摘要:
The addition of the SuperQuat enolate to five- and six-membered heterocyclic tert-butyl sulfinimines led to a high syn-selectivity of up to 99:1 in good to excellent yields. The reaction Is tentatively proposed to proceed through an open-chain transition state with the presence of an alpha-heteroatom on the sulfinimine leading to high diastereoselectivities. The adducts were derivatized to beta-amino esters and amides in a facile manner.
Asymmetric process for the preparation of diarylethylpiperazines derivatives and novel asymmetric diarylmethylamines as intermediates
申请人:——
公开号:US20040077861A1
公开(公告)日:2004-04-22
An asymmetric synthesis of diarylmethylpiperazines is described. The synthetic route enables preparation of a variety of enatiomerically pure amines with different N-alkyl groups. The invention includes an asymmetric addition of organometallic compounds to chiral sulfinimine to give adducts in predominantly one diastereomer can subsequently be transferred into pure enantiomers of by cleavage of the chiral auxilliary which is followed by synthesis of the piperazine ring by alkylation procedures.
NEW ASYMMETRIC PROCESS FOR THE PREPARATION OF DIARYLMETHYLPIPERAZINES DERIVATIVES AND NOVEL ASYMMETRIC DIARYLMETYLAMINES AS INTERMEDIATES
申请人:AstraZeneca AB
公开号:EP1368325B1
公开(公告)日:2008-08-27
US7045625B2
申请人:——
公开号:US7045625B2
公开(公告)日:2006-05-16
US7423154B2
申请人:——
公开号:US7423154B2
公开(公告)日:2008-09-09
[EN] NEW ASYMMETRIC PROCESS FOR THE PREPARATION OF DIARYLMETHYLPIPERAZINES DERIVATIVES AND NOVEL ASYMMETRIC DIARYLMETYLAMINES AS INTERMEDIATES<br/>[FR] NOUVEAU PROCEDE ASYMETRIQUE DE PREPARATION DE DERIVES DE DIARYLMETHYLPIPERAZINES ET NOUVELLES DIARYLMETHYLAMINES ASYMETRIQUES EN TANT QU'INTERMEDIAIRES
申请人:ASTRAZENECA AB
公开号:WO2002070492A1
公开(公告)日:2002-09-12
An asymmetric synthesis of diarylmethylpiperazines is described. The synthetic route enables preparation of a variety of enatiomerically pure amines with different N-alkyl groups. The invention includes an asymmetric addition of organometallic compounds to chiral sulfinimine to give adducts in predominantly one diastereomer can subsequently be transferred into pure enantiomers of by cleavage of the chiral auxilliary which is followed by synthesis of the piperazine ring by alkylation procedures.