Epoxyalcohol Route to Hydroxyethylene Dipeptide Isosteres. Stereodivergent Synthesis of the Diamino Alcohol Core of Ritonavir and Its C-2 Epimer
作者:Fabio Benedetti、Federico Berti、Stefano Norbedo
DOI:10.1021/jo025616g
日期:2002.11.1
A stereoselective synthesis of hydroxyethylene dipeptide isosteres based on the 1,4-diamino-2-hydroxybutane structure is described. Horner-Emmons olefination of phosphonates derived from alpha-amino acids, stereoselective reduction of the resulting enones to allylic alcohols, and syn epoxidation of the latter lead to enantiomerically pure 1-amino-2-hydroxy-3,4-epoxybutanes, key intermediates in the
描述了基于1,4-二氨基-2-羟基丁烷结构的羟乙烯二肽等排体的立体选择性合成。衍生自α-氨基酸的膦酸酯的Horner-Emmons烯化,立体选择性地将所得烯酮还原为烯丙醇,以及后者的顺环氧化反应生成对映体纯的1-氨基-2-羟基-3,4-环氧丁烷综合。环氧醇与Red-Al的还原裂解以高度区域选择性的方式进行,得到1-氨基-2,4-二羟基丁烷,通过对第二个2-羟基的选择性保护,环化为1,3-恶唑烷酮,进一步精制4-羟基。两个C-2差向异构体,4-氨基-2- hydroxybutanes是通过用于环化的条件适当选择使用。该方法通过一系列六个羟乙烯二肽等位基因的合成得到证明,包括有效的HIV蛋白酶抑制剂利托那韦18的二氨基醇核心及其C-2差向异构体11a。