,3,4-thiadiazolo[3,2-a]pyrimidin-5(5H)-one containing the active methylene group reacts easily with carbon disulfide and phenyl isothiocyanate in the presence of sodium hydride. Further alkylation of the reaction product by alkyl halides results in the formation of the corresponding 1,3,4-thiadiazolo[3,2-a]pyrimidine derivatives containing a ketene dithioacetal fragment.
                                    摘要2-Ethoxycarbonylmethyl-7-methyl-1,3,4-thiadiazolo[3,2-a]pyrimidin-5(5H)-one 含有活性亚甲基,在氢化
钠存在下易与
二硫化碳和异
硫氰酸苯酯反应。烷基卤化物对反应产物的进一步烷基化导致相应的 1,3,4-
噻二唑并 [3,2-a] 
嘧啶衍
生物的形成,该衍
生物含有乙
烯酮二硫代缩醛片段。