An Intramolecular PIFA-Mediated Metal-Free Allylic Oxycarbonylation Reaction and Its Application to the Preparation of Furopyrimidinones
作者:Irantzu Couto、Imanol Tellitu、Esther Domínguez
DOI:10.1021/jo101797s
日期:2010.11.19
The preparation of a series of furo[3,4-d]pyrimidinones by an unprecedented PIFA-mediated intramolecular allylic oxycarbonylation reaction developed on 5-carbamoyl-substituted Biginelli adducts is presented The construction of the fused lactone by a metal-free C-H activation process, without the need of an additional functionalization step, is featured in the present work
A General, Effcient and Green Procedure for Synthesis of Dihydropyrimidine-5-carboxamides in Low Melting Betaine Hydrochloride/Urea Mixture
作者:Peng Liu、Jianwu Hao、Zhanhui Zhang
DOI:10.1002/cjoc.201500862
日期:2016.6
A simple, facile and convenient strategy has been developed for the synthesis of dihydropyrimidine‐5‐carboxamides in low melting mixture of betaine hydrochloride/urea. In this procedure, the low melting mixture of betaine hydrochloride/urea plays a triple role: as a catalyst, solvent and reactant. The present green protocol has advantages such as high yield of products, short reaction times, operational