Studies on the Total Synthesis of Lactonamycin: Construction of Model ABCD Ring Systems
作者:David A. Henderson、Philip N. Collier、Gregoire Pavé、Paula Rzepa、Andrew J. P. White、Jeremy N. Burrows、Anthony G. M. Barrett
DOI:10.1021/jo052637c
日期:2006.3.1
Model studies on the synthesis of the tetracyclic ABCD ring system of lactonamycin (1) are described. The key step involved the double Michael addition reaction of alcohol 8 to propynoate esters to produce the BCD units 13 and 14 of the target 1. Alternatively, double Michael addition of alcohol 8 to di-tert-butyl acetylenedcarboxylate gave the corresponding BCD ring systems 36 and 37. Acid-mediated