Heterocyclic compounds from urea derivatives. Part XIX. Adducts from diaminoguanidines and aroyl isothiocyanates and their cyclisation
作者:Frederick Kurzer
DOI:10.1039/j39700001813
日期:——
1-Aminoamidino-4-aroyl(thiosemicarbazides) are produced in high yield from equimolar proportions of aroyl isothiocyanates and NN′-diaminoguanidine salts in aqueous methanol. They are bases and form hydrazones. Both the adducts and their hydrazones are ring-closed by alkali to 3-aryl-5-mercapto-1,2,4-triazoles. The cyclisation of 1-aminoamidino-4-aroyl(thiosemicarbazides) by acids affords, with loss
1-Aminoamidino基-4-芳酰基(氨基硫脲)在从芳酰基异硫氰酸酯和等摩尔比例高的产率生产NN在甲醇水溶液'-diaminoguanidine盐。它们是碱,并形成。加合物及其均被碱闭环成3-芳基-5-巯基-1,2,4-三唑。通过酸将1-氨基ami基-4-芳酰基(硫代氨基脲)环化,得到氨或肼,但主要产物2-芳基氨基-5-肼基-1,3,4-噻二唑和2-芳基氨基-5-基氨基-1,3,4-噻二唑为副产物。乙酸酐实现相同的环化,但同时使产物乙酰化。线性加合物的被酸直接闭环成2-芳酰基氨基-5-烷基(或芳基)异亚肼基-1,3,4-噻二唑。