Recyclization of Hydrazides of 2-Carboxyphenyldifurylmethanes: Synthesis of Novel 4,10-Dihydro-3<i>H</i>-pyridazino[1,6-<i>b</i>]isoquinolin-10-one System
A novel heterocyclic system of 4,10-dihydro-3H-pyridazino[1,6-b]isoquinolin-10-one has been synthesized via acid-catalyzed recyclization of hydrazides of 2-carboxyphenyldifurylmethanes as well as by alternative synthesis by interaction of the corresponding isocoumarine ketones with hydrazine hydrate.
The novel 4,10-dihydro-3H-pyridazino[1,6-b]isoquinolin-10-one heterocyclic system was synthesized by acid-catalyzed recyclization of 2-(difurylmethyl)benzohydrazides as well as by recyclization of (2-carboxyaryl)difurylmethanes to isocoumarins followed by the reaction with hydrazine hydrate.