Efficient and Benign One-Pot Conversion of <i>N</i>-Tosyl-1,4,5,6-tetrahydropyrimidines to Pyrimidines via Tandem <font>β</font>-Elimination and Aromatization
作者:Tien Ha Trieu、Jing Dong、Xiao-Xin Shi、Xia Lu、Qiang Zhang
DOI:10.1080/00397911.2013.764433
日期:2013.12.2
An efficient, mild, benign, and practical method for one-pot conversion of N-tosyl-1,4,5,6-tetrahydropyrimidines into pyrimidines is discussed in detail. In this method, N-tosyl-1,4,5,6-tetrahydropyrimidines are first prepared via N-tosylation of tetrahydropyrimidines with TsCl and then treated with 1.5 equivalents of NaOH in dimethylsulfoxide (DMSO) under air at 60 degrees C to afford corresponding pyrimidines in 70-95% yields via cascade -elimination and aromatization. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resources: Full experimental and spectral details.]