commercially available chiral 1,2-diamines were used as organocatalysts for the enantioselective conjugate addition of aldehydes, including α,α-disubstituted, to maleimides. The reaction was carried out in the presence of hexanedioic acid as an additive in aqueous solvents at room temperature. By employing (1S,2S)- and (1R,2R)-cyclohexane-1,2-diamine as organocatalysts, the corresponding Michael adducts bearing
The authors thank the Spanish Ministerio de Economia y Competitividad (MEC) (projects CTQ2010-20387, CTQ2010-21263-C02, and Consolider Ingenio 2010, CSD2007-00006), the Fondos Europeos para el Desarrollo Regional (FEDER), the COST Action CM0905 “Organocatalysis”, the Generalitat Valenciana (Prometeo/2009/039), the Basque Government (GV grant IT-291-07), the University of Alicante, and the University
作者感谢西班牙经济与竞争部长 (MEC)(项目 CTQ2010-20387、CTQ2010-21263-C02 和 Consolider Ingenio 2010、CSD2007-00006)、Fondos Europeos para el Desarrollo、CM05 “Organocatalysis”、Generalitat Valenciana (Prometeo/2009/039)、巴斯克政府(GV grant IT-291-07)、阿利坎特大学和巴斯克地区大学的财政支持。
Solvent-Induced Reversal of Enantioselectivity in the Synthesis of Succinimides by the Addition of Aldehydes to Maleimides Catalysed by Carbamate-Monoprotected 1,2-Diamines
The authors are grateful for the financial support from the Spanish Ministerio de Economia y Competitividad (MEC) (project number CTQ2011-24151), Fondos Europeos para el Desarrollo Regional (FEDER), the COST Action CM0905 “Organocatalysis”, the FP7 Marie Curie Action of the European Commission via the ITN ECHONET Network (FP7-MCITN-2012-316379), the University of Alicante and the University of the
Organocatalytic enantioselective conjugate addition of aldehydes to maleimides in deep eutectic solvents
作者:Jesús Flores-Ferrándiz、Rafael Chinchilla
DOI:10.1016/j.tetasy.2016.12.009
日期:2017.2
The conjugate enantioselective addition of aldehydes, mainly alpha,alpha-disubstituted, to maleimides leading to enantioenriched succinimides, has been achieved in recyclable deep eutectic solvents at room temperature. Enantiomerically pure carbamate-monoprotected trans-cyclohexane-1,2-diamines are used as organocatalysts, affording high yields and up to 94% ee of the final succinimides. The product can be extracted from the deep eutectic solvent, which retains the chiral organocatalyst, allowing both the solvent and catalyst to be reused. (C) 2016 Elsevier Ltd. All rights reserved.
A highly efficient large-scale asymmetric Michael addition of isobutyraldehyde to maleimides promoted by a novel multifunctional thiourea
作者:Zhi-wei Ma、Yu-xia Liu、Pan-li Li、Hang Ren、Yu Zhu、Jing-chao Tao
DOI:10.1016/j.tetasy.2011.10.002
日期:2011.10
A novel class of chiral multifunctional thioureas bearing a chiral lipophilic beyerane scaffold and a primary amino group were designed and prepared. The thioureas were proven to be effective for catalyzing the asymmetric Michael addition between isobutyraldehyde and maleimides with only 0.5 mol% catalyst loading, and exhibited double asymmetric induction. Both of the catalysts afforded the corresponding adduct with high to excellent yields (up to 98%) and excellent enantioselectivities (up to 99%). Furthermore, this catalytic system can be used efficiently in large-scale reactions with the yields and enantioselectivities being maintained at the same level. (C) 2011 Elsevier Ltd. All rights reserved.