Ultrasound-Promoted Synthesis of Quinolone and Isoquinolone Derivatives

Abstract
Quinolinium and isoquinolinium salts are easily oxidized by potassium tert-butylate in tert-butanol under ultrasonic irradiation yielding quinolones and isoquinolones. Compared to the methods previously known, the main advantages of our process are shorter reaction times, easier work-up and good to quantitative yields.