An efficient one-pot synthesis of pyrimido[2,1-b][1,3]thiazine derivatives by reaction of activated acetylenes, thiouracils, and isocyanides
作者:Robabeh Baharfar、Seyed Meysam Baghbanian、Seyed Mohammad Vahdat
DOI:10.1016/j.tetlet.2011.09.008
日期:2011.11
formed by the addition of isocyanides to dialkyl acetylenedicarboxylates, was trapped by thiouracils to yield a ketenimine intermediate, which cyclized and then rearranged to afford pyrimido[2,1-b][1,3]thiazines in good yields.
通过将异氰酸酯加到乙炔二羧酸二烷基酯中形成的反应性1:1两性离子中间体被硫尿嘧啶捕获,得到酮亚胺中间体,将其环化,然后重排,得到嘧啶并[2,1- b ] [1,3]噻嗪良品率高。