Direct conversion of N-alkoxy .beta.-lactams to carbapenams: application to the synthesis of the bicyclic PS-5 keto ester
作者:Matthew A. Williams、Chi Nung Hsiao、Marvin J. Miller
DOI:10.1021/jo00008a022
日期:1991.4
The synthesis and direct conversion of N-alkoxy beta-lactams to the carbapenam ring system is described. This novel cyclization apparently proceeds by initial carbene-mediated ylide formation with concomitant rearrangement. The title reaction is applied to the construction of the methyl ester of the bicyclic beta-lactam precursor of PS-5.