silver-mediated aerobic approach to access 2-methyl-chromone-3-carboxylic acid from the reaction of 4-hydroxy coumarin and enol ester in the presence of base has been presented. Mechanistic investigation suggests that the base induced Michael-type addition reaction of 4-hydroxy coumarin to the enol ester resulting the sequential ring opening and closing with the liberation of acetone are the key-steps for the overall
已经提出了一种
银介导的有
氧方法,用于在碱存在下从
4-羟基
香豆素和
烯醇
酯的反应中获得
2-甲基色酮-3-
羧酸。机理研究表明,碱诱导
4-羟基
香豆素与
烯醇
酯的迈克尔型加成反应,导致随着
丙酮的释放而依次开环和闭环是整个转化的关键步骤。通过 DFT 对
中间体能量的理论计算支持所提出的反应机制。