Condensation of salicylaldehydes with ethyl 4,4,4-trichloro-3-oxobutanoate: a facile approach for the synthesis of substituted 2H-chromene-3-carboxylates
作者:Mudulkar Sairam、Gannerla Saidachary、Bhimapaka China Raju
DOI:10.1016/j.tetlet.2015.01.114
日期:2015.3
A highly efficient and simple protocol has been developed for the preparation of ethyl 2-oxo-2H-chromene-3-carboxylates 3a–v by the condensation of salicylaldehydes 1a–v with ethyl 4,4,4-trichloro-3-oxobutanoate 2 for the first time. The reaction is proceeding via Knoevenagel pathway followed by a selective addition of the phenolic hydroxyl group to the carbonyl group adjacent to the CCl3 group rather
通过将水杨醛1a - v与4,4,4-三氯-3-氧代丁酸乙酯缩合,已开发出一种高效且简单的方案,用于制备2-oxo-2 H-色烯-3-羧酸乙酯3a – v第一次2。该反应通过Knoevenagel途径进行,随后由于强的电子吸收作用,将酚羟基选择性地添加到与CCl 3基团相邻的羰基上而不是酯羰基上,并且生成了香豆素衍生物3a,消除了CHCl 3。