A β-Lactam-Based Stereoselective Access to β,γ-Dihydroxy α-Amino Acid-Derived Peptides with Either α,β-Like or Unlike Configurations
作者:Claudio Palomo、Mikel Oiarbide、Aitor Landa、Aitor Esnal、Anthony Linden
DOI:10.1021/jo001786m
日期:2001.6.1
A concise access to alpha,beta-dihydroxy alpha-amino acid-derived N-carboxy anhydrides (NCAs) with either like or unlike relative configuration is described. The key steps of the synthetic route are the preparation of the nonracemic 4-alkenyl beta-lactams, through either Horner-type olefination of a common 4-formyl beta-lactam or the Corey-Winter alkene synthesis applied to 4-dihydroxyalkyl beta-lactams
简述了获得具有相似或不同相对构型的α,β-二羟基α-氨基酸衍生的N-羧酸酐(NCA)的方法。合成路线的关键步骤是通过普通的4-甲酰基β-内酰胺的霍纳型烯化反应或用于4-二羟基烷基β-内酰胺的Corey-Winter烯烃合成制备非外消旋的4-烯基β-内酰胺。 ,然后进行Sharpless AD反应,随后TEMPO促进了相应的4-取代的3-羟基β-内酰胺的扩环。还已经在各种反应条件下研究了用不同的O-和N-亲核试剂,包括导致肽的α-氨基酯处理,由此制备的NCA的打开。