Synthesis of [1] benzopyrano[2,3,4-kl]acridin-3-ol and its analogues as pentacyclic compounds

Abstract

A new heterocyclic compound, [1]benzopyrano[2,3,4-kl]acridin-3-ol was synthesized by cyclization of xanthone derivatives. The key compound, 1-(3'-methoxyanilino)-xanthone, was prepared from 1-aminoxanthone. [1]benzopyrano[2,3,4-kl]acridin-3-ol analogues, [1]benzothiopyrano[2,3,4-kl]acridin-3-ol, pyrido[3',2' : 5,6]-pyrano[2,3,4-kl]acridin-3-ol and pyrido[3',2' : 5,6]thiopyrano[2,3,4-kl]acridin-3-ol were synthesized by the same method.