Organocatalytic Enantioselective Michael Addition of Silyl Malonate to α,β-Unsaturated Enones: One-pot Synthesis of Chiral δ-Keto Esters
作者:Ji Yeon Lee、Dae Young Kim
DOI:10.5012/bkcs.2013.34.9.2569
日期:2013.9.20
E-mail: dyoung@sch.ac.krReceived April 22, 2013, Accepted May 24, 2013Key Words : Asymmetric catalysis, Organocatalysis, Michaeladdition, δ-Keto esters, Silylmalonate The Michaeladdition reaction is widely recognized as oneof the most efficient carbon-carbon bond-forming reactionsin organic synthesis,
A series of (Z)-5-arylmethlene-1,3-oxazine-4,6-diones was synthesized in enantiomerically pure form and found to serve as the attractive alternatives of 6-arylmethylene-1,4-oxazepane-5,7-diones.
A General Organocatalytic Enantioselective Malonate Addition to α,β-Unsaturated Enones
作者:Veit Wascholowski、Kristian Rahbek Knudsen、Claire E. T. Mitchell、Steven V. Ley
DOI:10.1002/chem.200800673
日期:2008.7.7
A general enantioselective organocatalytic conjugate addition procedure of a variety of malonates to alpha,beta-unsaturated enone systems is presented. The reaction is efficiently catalysed by the pyrrolidinyl tetrazole catalyst 1. Cyclic, acyclic and aromatic enones can be used and the reaction with ethyl malonates 3 b provides the Michaeladdition products in high yields with good to excellent enantioselectivities