Asymmetric synthesis of homochiral differentially protected bis-β-amino acid scaffolds
作者:Steven D Bull、Stephen G Davies、Paul M Roberts、Edward D Savory、Andrew D Smith
DOI:10.1016/s0040-4020(02)00369-1
日期:2002.6
strategy for the asymmetric synthesis of homochiral [(R,R)- or (S,S)-], or meso-(R,S) bis-β-amino acid scaffolds, formally resulting from the stepwise conjugate addition of two differentially protected homochiral lithium amides to two α,β-unsaturated esters attached to a central arene, is demonstrated. Further manipulation enables the efficient synthesis of orthogonally protected pseudo-meso or pseudo-C2
不对称合成纯手性[(R,R)-或(S,S)-]或内消旋-(R,S)bis-β-氨基酸支架的不对称合成的策略,这是由两个不同的化合物通过逐步共轭添加而形成的证明了对连接到中心芳烃上的两个α,β-不饱和酯的保护的手性锂酰胺。进一步的操作使得能够通过选择性的N-苄基或N-烯丙基脱保护作用,有效地合成正交保护的伪内消旋或伪C 2对称骨架,从而实现区域,立体和化学选择性官能化。