Thermolysis of N-Aryl Enaminoimine Hydrochloride Derivatives: A Short and General Method for the Synthesis of Pyranoquinolin-3-one and Pyranoacridin-3-one Derivatives

A short synthesis of 3H-pyrano[3,2-f]quinolin-3-one, 3H-acenaphtho[1,2-b]pyrano-[3,2-f]quinolin-3-one, and 3H-benzo[h]pyrano[3,2-a]acridin-3-one derivatives are described via thermolysis of suitable enaminoimine hydrochloride derivatives.