one-pot synthesis method of 3-heterocycle substitutued coumarin derivatives was reported. 3-(2'-benzoxazole)2H-l-benzopyran-2-one derivatives were synthesized from substituted salicylaldehydes, o-aminophenols and ethyl cyanoacetate in n-butanol under the benzoic acid catalysis in one-pot reaction. This one-pot synthesis has a wide substrate scope and the salicylaldehydes with electron-donating group gave
报道了一种新的 3-杂环取代香豆素衍生物的一锅法合成方法。3-(2'-benzoxazole)2H-l-benzopyran-2-one 衍生物是由取代的水杨醛、邻氨基苯酚和氰基乙酸乙酯在正丁醇中在苯甲酸催化下在一锅反应中合成的。这种一锅法合成具有广泛的底物范围,并且具有给电子基团的水杨醛收率良好。香豆素衍生物通过简单的过滤以高纯度和良好的收率获得,并通过 1 H NMR和MS表征。推测可能的机制。该反应具有弱酸催化、反应时间短、实验步骤简单、产品纯度高等特点。
One-pot catalyst-free synthesis of 3-heterocyclic coumarins
作者:Shaoliang Jiang、Jianrong Gao、Liang Han
DOI:10.1007/s11164-015-2070-x
日期:2016.2
3-Heterocyclic coumarins were prepared in one-pot three-component reaction without catalyst. The mixture of salicylaldehydes, ethyl cyanoacetate, and o-aminophenols or o-phenylenediamines in refluxing n-butanol gave title compounds with good yields and high purity. Short reaction time, mild reaction condition, simple workup, and less waste are significant advantages of the presented method.