(3SR, 4RS)-3-((RS)-1-hydroxyethyl)- and -((RS)-1-acyloxyethyl)-2-oxo-4-azetidineacetic acid compounds and a process for preparing the same
申请人:Merck & Co., Inc.
公开号:EP0032400A1
公开(公告)日:1981-07-22
Disclosed is a process comprising the steps of treating a compound of the formula:
with a carboxylic acid R4CO2H in the presence of a triorganophosphine and an activating agent therefor to prepare a compound of the formula:
followed by hydrolysis to cleave COR4; wherein R' is hydrogen or a readily removable protecting group and R4CO is a readily removable acyl radical.
This process can be used for the stereocontrolled total synthesis of thienamycin.
本发明公开了一种工艺,包括以下步骤:在三有机膦和活化剂存在下,用羧酸 R4CO2H 处理式
在三有机膦及其活化剂存在下,用羧酸 R4CO2H 处理制备式化合物:
其中 R' 为氢或易于去除的保护基,R4CO 为易于去除的酰基。
该工艺可用于噻吩霉素的立体控制全合成。