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