Heterocyclic compounds from urea derivatives. Part XVII. Reactions of 1-phenylcarbonohydrazide and 1-phenylthiocarbonohydrazide with carbodi-imides
作者:Frederick Kurzer、Michael Wilkinson
DOI:10.1039/j39700000026
日期:——
Equimolar quantities of 1-phenylcarbonohydrazide and diarylcarbodi-imides react additively in dimethylformamide, giving good yields of 1-NN′-diarylamidino-5-phenylcarbonohydrazides. These are readily cyclised by aqueous alkali to 4-anilino-3-arylamino-1,2,4-triazolin-5-ones, with loss of arylamine. Thermolysis effects the same cyclisation, but produces additionally (and sometimes exclusively) 4-aryl-3-arylamino-1