Formylation Products of Thioamides; VII1. Synthesis of NewN-(3-Aminothioacryloyl)-formamidines andN,N′-Bis[aminomethylidene]thioureas by Bisiminoformylation of Thioacetamides and Thiourea with Formamide Acetals
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.