一种原子经济,选择性和方便的单罐操作规程,可用于合成具有医学优势的新型chromeno [2,3- d ]嘧啶支架,即巴比妥酸衍生物,1,3环二酮和各种醛的多组分反应据报道,室温下水介质中存在四正丁基碘化铵(TBAI)作为电解质。这种具有生态学意义的新颖概念提供了对环境无害的合成路线,较短的反应时间和简便的后处理步骤,且收率极高(88%至90%),并且还有利于面向多样性的大规模流程。通过IR,MS,NMR和CHN分析对合成产物进行表征。
Abstract An efficient, simple, and environmentally friendly synthesis of a series of chromeno[2,3-d]pyrimidine-trione derivatives has been accomplished via the three-component reaction of a barbituric acid, dimedone/cyclohexane-1,3-dione, and aromatic aldehydes using Sc(OTf)3 as a recyclable catalyst undersolvent-free condition. This method exploits the use of Sc(OTf)3 as a Lewisacid catalyst in
A simple and one-pot synthesis of new chromeno[2,3-d]pyrimidine-triones by a three-component condensation reaction of barbituric acids, aldehydes and cyclohexane-1,3-diones in refluxing ethanol in the presence of p-toluenesulfonic acid (p-TSA) for 3—10 h is reported. Two cyclohexane-1,3-diones, four barbituric acids and six substituted aldehydes were chosen for the library validation. Prominent among the advantages of this new method are operational simplicity, good yields and easy work-up procedures employed.