作者:V. Srirajan、A.R.A.S. Deshmukh、V.G. Puranik、B.M. Bhawal
DOI:10.1016/0957-4166(96)00352-7
日期:1996.9
A diastereoselective synthesis of β-Lactams 5a-e and 6a-e has been achieved, via a Staudinger reaction using imines derived from (1S)-(+)-camphor-10-sulfonamide, in good yields. The major diastereomers 6a-e were isolated in pure form by crystallization. The absolute configuration of the β-lactam 6b was established as 3R and 4S by X-ray analysis. The major diastereomers 6b and 6c were converted into
β-内酰胺5a-e和6a-e的非对映选择性合成已通过Staudinger反应,使用衍生自(1 S)-(+)-樟脑10磺酰胺的亚胺以高收率实现。通过结晶分离出纯净形式的主要非对映异构体6a-e。通过X射线分析将β-内酰胺6b的绝对构型确定为3R和4S。主要的非对映异构体6b和6c转化为对映体纯的α-羟基酯衍生物7-9。