.beta.-Lactams. 1. Highly diastereoselective alkylation of 4-acetoxyazetidin-2-one useful for 1.beta.-methylcarbapenem synthesis
摘要:
On the basis of the principle of hard and soft acids and bases, a highly diastereoselective ''asymmetric soft acid-soft base imine alkylation'' was developed. 4-Acetoxyazetidin-2-one (5) was alkylated with the tin(II) enolates of 3-acyl-(4S)-ethyl(and isopropyl)-1,3-thiazolidine-2-thiones 7a,b and 21a,b. The resultant alkylation products (9a,b and 24a,b) could be converted to 17, the key intermediate for the syntheses of both thienamycin (2) and imipenem (3), and to 35, the key intermediate for the synthesis of 1-beta-methylcarbapenem.
The synthesis of 3-(1′-hydroxyethyl)-2-azetidinone-4-yl acetic acid via dianion chemistry - an important intermediate in thienamycin total synthesis
作者:I Shinkai、T Liu、R.A Reamer、M Sletzinger
DOI:10.1016/s0040-4039(00)85742-1
日期:1982.1
A convenient synthesis of 3-(1′-hydroxyethyl)-2-azetidinone-4-yl aceticacid, one of the key intermediates in the thienamycin total synthesis, based on the chemistry of the dianion derived from readily available 2-azetidinone-4-yl aceticacid is described.