Synthesis of multifunctionalized building blocks via vinylogous addition of Chan’s diene to carbonyl and carbonyl-related electrophiles, mediated by molecular iodine
摘要:
The synthesis of multifunctionalized beta-ketoesters has been achieved by using molecular iodine as a catalyst under very mild conditions. The vinylogous addition of Chan's diene 1 to carbonyl and carbonyl-related compounds (aldehydes, ketones, imines and acetals) occurred with high efficiencies and with complete gamma-selectivity, giving a useful method for the synthesis of interesting libraries of different delta-functionalized beta-ketoesters. (C) 2011 Elsevier Ltd. All rights reserved.