Combining chiral elements: a novel approach to asymmetric phase-transfer catalyst design
摘要:
A new dicationic asymmetric phase-transfer catalyst, designed by combining chiral elements, is described. Catalytic testing using standard glycine imino ester alkylations shows good yields and moderate enantioselectivities. (c) 2005 Elsevier Ltd. All rights reserved.
A new asymmetric two-center phase-transfercatalyst was designed and a catalyst library containing more than 40 new two-center catalysts was constructed. The catalysts were applied in phase-transferalkylations and Michael additions to afford the corresponding products in up to 93% ee and 82% ee, respectively.
Synthesis and competency of a tartrate-derived dicationic solid–liquid phase-transfer catalyst
作者:Michelle E. Rueffer、Linda K. Fort、Darren K. MacFarland
DOI:10.1016/j.tetasy.2004.09.004
日期:2004.10
A new asymmetric phase-transfer catalyst is described, along with a new, flexible synthetic scheme using a tartaric acid chloride. Alkylations and Michael reactions on a glycine imino ester show the new catalyst to be an effective phase-transfer catalyst with limited enantioselectivity. (C) 2004 Published by Elsevier Ltd.
Combining chiral elements: a novel approach to asymmetric phase-transfer catalyst design
作者:Walter E. Kowtoniuk、Darren K. MacFarland、Gregory N. Grover
DOI:10.1016/j.tetlet.2005.06.084
日期:2005.8
A new dicationic asymmetric phase-transfer catalyst, designed by combining chiral elements, is described. Catalytic testing using standard glycine imino ester alkylations shows good yields and moderate enantioselectivities. (c) 2005 Elsevier Ltd. All rights reserved.