Asymmetric synthesis of cyclic β-amino acids and cyclic amines via sequential diastereoselective conjugate addition and ring closing metathesis
作者:Ann M Chippindale、Stephen G Davies、Keiji Iwamoto、Richard M Parkin、Christian A.P Smethurst、Andrew D Smith、Humberto Rodriguez-Solla
DOI:10.1016/s0040-4020(03)00411-3
日期:2003.4
β-unsaturated esters followed by ring closing metathesis is used to afford efficiently a range of substituted cyclic β-amino esters in high d.e. Alternatively, conjugate addition to α,β-unsaturated Weinreb amides, functional group conversion and ring closing metathesis affords cyclic amines in high d.e. The further application of this methodology to the synthesis of a range of carbocyclic β-amino esters via
将锂(S)-N-烯丙基-N -α-甲基苄基酰胺的非对映选择性共轭加成到一系列的α,β-不饱和酯中,然后进行闭环复分解,可有效地提供一系列高取代度的取代的环状β-氨基酯或者,将共轭物添加到α,β-不饱和Weinreb酰胺,官能团转化和闭环复分解反应中,可得到高度环状的胺。该方法的进一步应用是通过共轭物添加,烯醇化烷基化来合成一系列碳环β-氨基酯并且还描述了闭环复分解。这种方法得到的应用,在脱保护后,(小号)-homoproline,(小号)-homopipecolic酸,(小号)-丝氨酸和(1 S,2 S)-反-戊酸。