Diversity-Oriented Synthesis of Coumarin-Linked Benzimidazoles via a One-Pot, Three-Step, Intramolecular Knoevenagel Cyclization
作者:Po-Hsin Eric Yao、Sunil Kumar、Yu-Li Liu、Chiu-Ping Fang、Chia-Chen Liu、Chung-Ming Sun
DOI:10.1021/acscombsci.7b00004
日期:2017.4.10
Diversity-oriented synthesis of coumarin-linked benzimidazoles from N-(2-aminophenyl)-2-cyanoacetamide was achieved via a one-pot, three-step sequential reaction in excellent yields. In situ intramolecular cyclization of the cyanoacetamide afforded benzimidazoles which subsequently underwent a Knoevenagel condensation of the 2-cyanomethylbenzimidazoles with salicylaldehydes promoted by triethylamine
N-(2-氨基苯基)-2-氰基乙酰胺通过一锅三步顺序反应以优异的收率实现了香豆素连接的苯并咪唑的多样性导向合成。氰基乙酰胺的原位分子内环化得到苯并咪唑,随后使2-氰基甲基苯并咪唑与三乙胺促进的水杨醛进行Knoevenagel缩合反应以达到目标化合物。的重要中间体,2-(2-亚氨基-2- ħ -苯并吡喃-3-基)-1 ħ -苯并咪唑用X射线分析,并进一步水解为2-(香豆素-3-基)苯并咪唑在酸性条件下。在合成的化合物中,发现有一些是猪肾d-氨基酸氧化酶(pk DAO)。