Reactions of 4-substituted 5H-1,2,3-dithiazoles with primary and secondary amines: fast and convenient synthesis of 1,2,5-thiadiazoles, 2-iminothioacetamides and 2-oxoacetamides
作者:Lidia S. Konstantinova、Oleg I. Bol'shakov、Natalia V. Obruchnikova、Svetlana P. Golova、Yulia V. Nelyubina、Konstantin A. Lyssenko、Oleg A. Rakitin
DOI:10.1016/j.tet.2010.04.033
日期:2010.6
aliphatic amines and benzylamine afforded 1,2,5-thiadiazole-3(2H)-thiones 3 and 1,2,5-thiadiazol-3(2H)-ones 6, respectively. The structure of dithiazolone 3f was confirmed by X-ray diffraction analysis. The reaction of dithiazolone 2e bearing an electron-donating methyl group in the 4-position gave 2-oxoacetamide 7e in high yield. The reaction of thiones 1 with secondary aliphatic amines in DMSO yielded
在室温下用伯脂族胺和苄胺处理在氯仿中的5 H -1,2,3-二噻唑-5-硫酮1和在THF中的5 H -1,2,3-二噻唑-5-酮2 1,2,5-噻二唑-3(2 H)-硫酮3和1,2,5-噻二唑-3(2 H)-ones 6。通过X射线衍射分析确认了二噻唑酮3f的结构。在4-位带有供电子甲基的二噻唑酮2e的反应以高收率得到2-氧代乙酰胺7e。硫酮的反应1用DMSO中的脂肪族仲胺与仲硫磺一起以中等收率得到2-亚氨基硫代乙酰胺8。有趣的是,在相同条件下用仲胺处理二噻唑酮2可获得2-氧代乙酰胺9-相应的亚氨基衍生物10的水解产物,其分离为10b。提出了形成产物的通用机制。