作者:Harjit Singh、Paramjit Singh、Kanwal Deep
DOI:10.1016/s0040-4020(01)88577-x
日期:1983.1
2,4-Dioxathiazolidine derivatives (7) have been obtained in synthetically useful yields by the condensations of easily available 1-substituted-4,4,6-trimethyl-1,4-dihydropyrimidine-2(3H) thione derivatives (4) and α-halogenated carboxylic acids in aqueous medium. The condensations of 4 with α-haloketones in ethanol containing cone HCl furnish 2-oxa-4-thiazolines (8). The condensations of N,N-dialkyl-N'-aryl
2,4- Dioxathiazolidine衍生物(7)已在合成有用的产率通过的缩合获得容易获得的1-取代-4,4,6-三甲基-1,4-二氢嘧啶-2(3H)硫酮衍生物(4)和在水性介质中的α-卤代羧酸。在含有浓HCl的乙醇中,4与α-卤代酮的缩合反应提供了2-oxa-4-thiazolines(8)。在浓HCl存在下,N,N-二烷基-N'-芳基硫脲或芳基硫代氨基甲酸酯与α-氯代羧酸和α-卤代酮的缩合分别得到7和8。