Enolised α-thiocyanato-β-dicarbonyl compounds dimerise in ethanol at room temperature to give tautomeric 4,5-disubstituted 2-amino- and 2-acetamido-thiazoles by a C-S-C + C-N cyclisation. Tautomerism is due to the unusual 4-(β-dicarbonyl-α-thio) substituent. Competing intramolecular cyclisations lead to minor amounts of heterocycles containing the thiazole and/or oxathiole ring systems
                                    烯化的α-
硫氰酸根合-β-二羰基化合物在室温下在
乙醇中二聚,通过CSC + CN环化反应生成互变异构体4,5-二取代的2-
氨基-和2-乙酰
氨基-
噻唑。互变异构是由于不寻常的4-(β-二羰基-α-
硫代)取代基。竞争性的分子内环化反应会导致少量的含有
噻唑和/或草
硫醇环系统的杂环