N-Heterocyclic Carbene Catalyzed Cyclocondensation of α,β-Unsaturated Carboxylic Acids: Enantioselective Synthesis of Pyrrolidinone and Dihydropyridinone Derivatives
作者:Xiang-Yu Chen、Zhong-Hua Gao、Chun-Yu Song、Chun-Lin Zhang、Zhi-Xiang Wang、Song Ye
DOI:10.1002/anie.201407469
日期:2014.10.20
The catalytic cyclocondensation of in situ activated α,β‐unsaturated carboxylic acids was developed. N‐heterocyclic carbenes efficiently catalyzed the generation of α,β‐unsaturated acyl azolium intermediates from α,β‐unsaturated carboxylic acids via in situ generated mixed anhydrides for the enantioselective [3+2] and [3+3] cyclocondensation with α‐amino ketones and alkyl(aryl)imines, respectively
开发了原位活化的α,β-不饱和羧酸的催化环缩合反应。N-杂环卡宾通过原位生成的混合酸酐有效催化α,β-不饱和羧酸从α,β-不饱和羧酸生成α,β-不饱和酰基偶氮中间体,与α-氨基进行对映选择性[3 + 2]和[3 + 3]环缩合。酮和烷基(芳基)亚胺。分离出相应的吡咯烷酮和二氢吡啶并酮,并具有高至优异的对映选择性。