Synthesis of 1,2,4-triazoles and 1,2,4,6-tetraazabicyclo[3.3.0]octanes from diphenyl cyanocarbonimidate. Competition between addition of hydrazines to esters or nitriles
作者:Peter J Garratt、Simon N Thorn、Roger Wrigglesworth
DOI:10.1016/s0040-4020(01)80516-0
日期:1993.1
The reaction of hydrazine with suitably substituted isoureas gives tetraazabicyclo[3.3.0]octanes. The products obtained in this reaction are extremely susceptible to the nature of the substrate and the reaction conditions, but a suitable combination of these can usually be found in order to form the bicyclooctane. In cases where the bicyclic system is not formed 1,2,4-triazoles are usually obtained