An expedient route to highly functionalized 2H-chromene-2-thiones via ring annulation of β-oxodithioesters catalyzed by InCl3 under solvent-free conditions
作者:Rajiv Kumar Verma、Girijesh K. Verma、Keshav Raghuvanshi、Maya Shankar Singh
DOI:10.1016/j.tet.2010.11.055
日期:2011.1
A convenient and one-pot synthesis of 3-aroyl/heteroaroyl-2H-chromene-2-thiones and benzo[f]2H-chromene-2-thiones has been developed by the condensation of β-oxodithioesters and salicylaldehydes/α-hydroxynaphthaldehydes in the presence of indium trichloride under solvent-free conditions. The reaction is operationally facile, readily scalable, and offers rapid entry into differentially substituted chromene-2-thione
通过β-氧代二硫代酯与水杨醛/α-的缩合反应,开发出了一种方便的一锅合成3-芳酰基/杂芳酰基-2 H-亚甲基-2-硫酮和苯并[ f ] 2 H-亚甲基-2-硫酮的方法。在无溶剂条件下在三氯化铟存在下生成羟基萘醛。该反应操作简便,易于扩展,可快速进入差异取代的亚甲基-2-硫酮骨架。