Stereoselective Synthesis of Dipeptide β-Turn Mimetics: 7-Benzyl and 8-Phenyl Substituted Azabicyclo[4.3.0]nonane Amino Acid Esters
作者:Wei Wang、Jianqing Yang、Jinfa Ying、Chiyi Xiong、Junyi Zhang、Chaozhong Cai、Victor J. Hruby
DOI:10.1021/jo0203591
日期:2002.9.1
A stereoselective method has been developed for the synthesis of 7- and 8-substituted dipeptide beta-turn mimetic azabicyclo[4.3.0]nonane amino acid esters. The allyl groups were introduced in high diastereoselectivity, controlled by 3-phenyl or 4-benzyl groups in pyroglutamic acid derivatives 3 or 9, respectively. The precursors, dehydroamino acids 7 and 13 derived from 5 or 11, underwent asymmetric
已开发出一种立体选择性方法,用于合成7和8位取代的二肽β-turn模拟氮杂双环[4.3.0]壬烷氨基酸酯。烯丙基以高非对映体选择性引入,分别由焦谷氨酸衍生物3或9中的3-苯基或4-苄基控制。用Burk的DuPHOS Rh(I)基催化剂对前体衍生自5或11的脱氢氨基酸7和13进行不对称氢化,以高立体选择性提供α-氨基酸衍生物。所得氨基酸8和14以高收率转化成β-转类似物6,5-双环内酰胺1a-d。