Ring Transformation of Pyrimidine-4(1<i>H</i>)-thiones with Cyclohexanespiro-3′-oxaziridine: Synthesis of 5-(2-Amino-1-arylethenyl)-1,2,4-thiadiazoles
作者:Michael Pätzel、Jürgen Liebscher
DOI:10.1055/s-1993-25974
日期:——
Pyrimidine-4 (1H)-thiones 2 react with cyclohexanespiro-3′-oxaziridine (3) by S-amination and ring transformation to give 5-(2-amino-1-arylethenyl)-1,2,4-thiadiazoles 5. Reactions of the precursors of 2, i. e. N-(3-aminothioacryloyl)formamidines 1, with cyclohexanespiro-3′-oxaziridine (3) mostly gave complex reaction mixtures containing the expected thiadiazoles 6, isomeric 5-formamidino-1,2-thiazoles 8, the 5-formylamino-1,2-thiazole 9 or 3-pyrrolidinocinnamonitrile 10.
嘧啶-4(1H)-硫酮2与环己烷螺-3'-氧氮杂环丙烷(3)通过S-胺化和环转化反应得到5-(2-氨基-1-芳基乙烯基)-1,2,4-噻二唑5。 2、i的前体的反应。 e. N-(3-氨基硫代丙烯酰基)甲脒 1 与环己烷螺-3'-氧氮丙啶 (3) 大部分生成复杂的反应混合物,其中含有预期的噻二唑 6、异构体 5-甲脒基-1,2-噻唑 8、5-甲酰氨基-1、 2-噻唑9或3-吡咯烷肉桂腈10。