Asymmetric organocatalytic conjugate addition of malonates to enones using a proline tetrazole catalyst
作者:Kristian Rahbek Knudsen、Claire E. T. Mitchell、Steven V. Ley
DOI:10.1039/b514636d
日期:——
5-Pyrrolidin-2-yltetrazole performs as a useful organocatalyst for the asymmetric addition of malonates to a range of enones, with good to excellent enantioselectivities.
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
Perfluorobutanesulfonamide organocatalyst 4 efficiently promotes asymmetric conjugateadditions of malonates to α,β-unsaturated ketones to afford the corresponding adducts with excellent enantiosel...
Simple chiral sulfonamide primary amine catalysed highly enantioselective Michael addition of malonates to enones
作者:Chunhua Luo、Yu Jin、Da-Ming Du
DOI:10.1039/c2ob07191f
日期:——
A chiral sulfonamide primary amine-organocatalysed, highly enantioselective Michael addition of malonates to enones has been developed. This reaction afforded the corresponding products in excellent yields (up to 99%) and excellent enantioselectivity (up to 99% ee).
Perfluoroalkanesulfonamide organocatalyst 7 efficiently promotes asymmetric Michael additions of malonates to enones in cyclohexane or water to produce the corresponding addition products with excellent yields and with up to 99% ee. (C) 2014 Elsevier Ltd. All rights reserved.