Asymmetric Michael addition reactions catalyzed by a novel upper-rim functionalized calix[4]squaramide organocatalyst
作者:Ke Yang、Zhiyan Ma、Hong-Xiao Tong、Xiao-Qiang Sun、Xiao-Yu Hu、Zheng-Yi Li
DOI:10.1016/j.cclet.2020.02.057
日期:2020.12
Abstract A novel upper-rim functionalizedcalix[4]squaramide organocatalyst bearing bis-squaramide and cyclohexanediamine scaffolds was designed and prepared to catalyse a serial of asymmetric Michael addition of 1,3-dicarbonyl compounds to α,β-unsaturated carbonyl compounds in high yields (up to 99 %) and good to excellent enantiomeric excesses (up to 99% ee). The comparative experiments indicated
Novel supramolecular organocatalysts of hydroxyprolinamide based on calix[4]arene scaffold for the enantioselective Biginelli reaction
作者:ZhengYi Li、HuaiJie Xing、GuoLi Huang、XiaoQiang Sun、JuLi Jiang、LeYong Wang
DOI:10.1007/s11426-011-4374-z
日期:2011.11
A series of novel supramolecular organocatalysts of hydroxyprolinamide based on the upper rim of calix[4]arene scaffold have been developed to catalyze enantioselective multi-component Biginelli reaction. Under the optimal conditions, the reactions occurred with moderate-to-excellent enantioselectivities (up to 98% ee). A plausible transition state constructed by the supramolecular interaction of hydrogen bond and cation-π between catalysts and substrates has been proposed.
Novel Prolinamide Organocatalysts Based on Calix[4]arene Scaffold for the Enantioselective Direct Aldol Reaction
作者:Zheng-Yi Li、Cheng-Xi Lu、Guoli Huang、Jie-Jie Ma、Hongsheng Sun、Leyong Wang、Yi Pan
DOI:10.2174/157017810791824919
日期:2010.9.1
A series of novel prolinamide organocatalysts based on calix[4]arene scaffold have been developed to catalyze the directasymmetricaldolreaction of aromatic aldehydes and cyclohexanone. Under the optimal condition, high isolated yields (up to > 99%) and enantioselectivities (up to 97% ee), and moderate diastereoselectivities (up to 85/15) were obtained.