A novel short-step methodology for the synthesis in good yields of functionalized coumarins has been developed starting from an activated precursor, the N-hydroxysuccinimide ester of O-acetylsalicylic acid. The procedure is based on a tandem C-acylation-cyclization process under mild reaction conditions. The structure of 3-methoxycarbonyl-4-hydroxy coumarin has been established by X-ray diffraction analysis and its geometry was compared with optimized parameters by means of DFT calculations.
一种新的短步骤方法学已被开发用于功能化
香豆素的高产率合成,该方法从N-羟基琥珀
酰亚胺酯的O-乙酰
水杨酸作为活化前体开始。该过程基于在温和反应条件下进行的串联C-酰化-环化反应。3-甲氧羰基-
4-羟基
香豆素的结构已通过X射线衍射分析确定,并通过DFT计算优化参数与其几何结构进行了比较。