A highly enantioselective approach has been developed for synthesising chiral succinimide derivatives via asymmetric Michael addition of diketones to maleimide using dihydroquinine as a catalyst in brine. The Michael adducts were obtained in yields up to 98% and with enantiomeric excesses up to 98% ee. (C) 2016 Elsevier Ltd. All rights reserved.
Conjugate Addition of 1,3-Dicarbonyl Compounds to Maleimides Using a Chiral C<sub>2</sub>-Symmetric Bis(2-aminobenzimidazole) as Recyclable Organocatalyst
作者:Eduardo Gómez-Torres、Diego A. Alonso、Enrique Gómez-Bengoa、Carmen Nájera
DOI:10.1021/ol202599h
日期:2011.11.18
The recyclable chiral 2-aminobenzimidazole-derived organocatalyst if efficiently promotes the room temperature asymmetric conjugate addition of 1,3-diketones, beta-ketoesters, and malonates to maleimide and N-substituted maleimides, affording the corresponding Michael adducts in excellent yields and enantioselectivities even at gram scale.