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.
Candida Rugosa lipase-catalyzed kinetic resolution of β-hydroxy-β-arylpropionates and δ-hydroxy-δ-aryl-β-oxo-pentanoates
作者:Chengfu Xu、Chengye Yuan
DOI:10.1016/j.tet.2004.12.059
日期:2005.2
A simple and convenient method was reported for the preparation of optically active beta-hydroxy-beta-arylpropionates, delta-hydroxy-delta-aryl-beta-oxo-pentanoates and their butyryl derivatives via CRL-catalyzed hydrolysis. The optically active products are potential precursors of some chiral pharmaceuticals and natural products. (C) 2005 Elsevier Ltd. All rights reserved.