A Cation-exchange Resin Promoted Imino Aldol Reaction, Leading to the Synthesis of 2-Isocephem and 2-Oxa-isocephem
作者:Makoto Shimizu、Masanori Tachi、Iwao Hachiya
DOI:10.1246/cl.2004.1394
日期:2004.10
Imino aldol reaction of ketene silyl acetals with the chiral imine 1 proceeds smoothly to giveβ-amino esters in good yields with high diasetereoselectivity under the influence of a cation-exchange resin, and the subsequent functional group transformations provide a formal synthesis of 2-isocephem and 2-oxa-isocephem β-lactam antibiotics.