A New Microwave-Assisted Organocatalytic Solvent-Free Synthesis of Optically Enriched Michael Adducts
作者:Antonio Procopio、Antonio De Nino、Monica Nardi、Manuela Oliverio、Rossella Paonessa、Raffaele Pasceri
DOI:10.1055/s-0030-1258126
日期:2010.7
A high-yielding reaction protocol for the microwave-assisted organocatalytic conjugate addition of diethyl malonate to enones under solvent-free conditions is proposed. The method still permits the use of cheap and commercially available L -proline furnishing very good performance at least in the case of 1-alkyl-3-monosubstituted enones.
Enantioselective Michael addition of malonates to α,β-unsaturated ketones catalyzed by 1,2-diphenylethanediamine
作者:Wei Wang、Ling Ye、Zhichuan Shi、Zhigang Zhao、Xuefeng Li
DOI:10.1039/c8ra07809b
日期:——
A general and highly enantioselective Michaeladdition of malonates to cinnamones and chalcones has been developed. The commercially available 1,2-diphenylethanediamine could be directly utilized as the organocatalyst to furnish the desired adducts in satisfactory yield (61–99%) and moderate to excellent enantiopurity (65 to >99% ee). β-Ketoester was also a competent donor and was employed to construct
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