Взаимодействие эфиров изоникотиновой кислоты с гидразином

Nitroisonicotinic acid hydrazides were synthesized by reaction of 3-nitroisonicotinic acid with hydrazine. Pyrido[3,4-d]pyridazin-1(2H)-ones were prepared by interaction of 3-acetyl-, cyclopropanoyl-, benzoyland 3-cyanoisonicotinic acid with hydrazine.