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
描述了合成乳酸环霉素(1)的四环ABCD环系统的模型研究。关键步骤涉及醇8与丙酸酯的双重迈克尔加成反应,以产生靶标1的BCD单元13和14。或者,将醇8两次迈克尔加成到乙酰化羧酸二叔丁酯上,得到相应的BCD环系统36和37。酸介导的13和14和36和37的二氢醌单缩酮单元的水解在空气存在下给出相应的醌7和39。这些被转换成ABCD四环单元6,图26A,40和42 lactonamycin的(1由任一或二羟基化环氧化和酸催化内酯化)。