N-Heterocyclic Carbene-Catalyzed Domino Reactions of Formylcyclopropane 1,1-Diesters: A New Synthesis of Coumarins
作者:Ding Du、Zhongwen Wang
DOI:10.1002/ejoc.200800599
日期:2008.10
N-Heterocyclic carbenes (NHCs) catalyze the reaction of formylcyclopropane 1,1-diesters with salicylaldehydes in a domino redox esterification/cyclization reaction to give coumarins in moderate to excellent yields. In addition, we also report the intramolecular conversion of compound 2f to dihydropyranone 4 catalyzed by NHC D. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
N-杂环卡宾 (NHC) 在多米诺氧化还原酯化/环化反应中催化甲酰基环丙烷 1,1-二酯与水杨醛的反应,以中等至极好的收率生成香豆素。此外,我们还报告了由 NHC D 催化的化合物 2f 向二氢吡喃酮 4 的分子内转化。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)