Synthesis of Pyrido[3', 2' : 5, 6]pyrano[4, 3, 2-de]quinoline

Abstract

Pyrido[3', 2' : 5, 6]pyrano[4, 3, 2-de]quinoline (1), which can be regarded as a combined structure of a xanthene analog and quinoline, was synthesized starting from 6-amino-5H-[1]benzopyrano[2, 3-b]pyridin-5-one (2).