Sc(III)-Catalyzed Enantioselective Addition of Thiols to α,β-Unsaturated Ketones in Neutral Water
摘要:
This report concerns Lewis acid catalyzed enantioselective sulfa-Michael addition in neutral water by using a very efficient Sc(OTf)(3)/bipyridine 1 catalytic system. It is noteworthy that the protocol presented employs water as a reaction medium and allows us to obtain very high stereoselectivity and satisfactory yields for beta-keto sulphides deriving from aliphatic thiols. The recovery and reuse of both the aqueous medium and the catalytic system is also reported.
Stereoselective thio-Michael addition to chalcones in water catalyzed by bovine serum albumin
作者:Nicoletta Gaggero、Domenico Carlo Maria Albanese、Giuseppe Celentano、Stefano Banfi、Alice Aresi
DOI:10.1016/j.tetasy.2011.06.024
日期:2011.6
A biomimetic, inexpensive, and simple method for the stereoselective thio-Michael addition of thiols to chalcones has been developed using bovine serum albumin (BSA) as a catalyst. Optically active products are obtained in high yield and with enantiomeric excesses of up to 70%. (C) 2011 Elsevier Ltd. All rights reserved.