Heterocyclic compounds from urea derivatives. Part XVIII. Adducts from aminoguanidines and aroyl isothiocyanates and their cyclisation
作者:Frederick Kurzer
DOI:10.1039/j39700001805
日期:——
1-Amidino-4-benzoyl(thiosemicarbazide) hydrochloride is cyclised by hydrochloric or orthophosphoric acid to 2-amino-5-benzamido-1,3,4-thiadiazole, by acetic anhydride to the corresponding acetyl derivative, and by alkali to 3-mercapto-5-phenyl-1,2,4-triazole. 1-Amino-2-phenylguanidine salts undergo an analogous series of reactions. The mechanism of these addition–cyclisations is discussed and correlated
等摩尔量的芳基异硫氰酸酯和氨基胍盐酸盐在甲醇水溶液中发生加成反应,可提供出色的产率的1-ami基-4-芳酰基(硫代氨基脲),可作为盐酸盐,苦味酸盐或游离碱分离。盐酸或正磷酸将1-yl基-4-苯甲酰基(硫代氨基脲)盐酸盐环化成2-氨基-5-苯甲酰胺基1,3,4-噻二唑,乙酸酐成相应的乙酰基衍生物,碱成3-巯基-5-苯基-1,2,4-三唑。1-氨基-2-苯基胍盐经历一系列类似的反应。讨论了这些加成环化的机理,并将其与类似反应的机理联系起来。