Asymmetric Michael–aldol tandem cyclization of ω-oxo-α,β-unsaturated esters with 10-mercaptoisoborneol methyl ether
摘要:
The asymmetric reaction of omega-oxo-alpha,beta-unsaturated esters with lithium chiral thiolates afforded the Michael-aldol tandem cyclization products in high yield and good stereo selectivity. Reductive desulfurization gave the corresponding optically pure 2-hydroxycycloalkanecarboxylates. (C) 2003 Elsevier Science Ltd. All rights reserved.
search for green chemistry methods for the enantioselective reduction of ketoesters Saccharomyces cerevisiae- and ruthenium-catalyzed reactions in water have been investigated. The highest enantiomeric excesses for the reduction of α- and β-ketoesters have been obtained by S. cerevisiae. Chiral ruthenium catalysts are active for the reduction of all ketoesters with low to moderate enantioselectivities