Facile synthesis of 1-substituted 4-H phthalazine, a versatile scaffold for chemically diverse phthalazines
作者:Rungsima Hadsarung、Sanit Thongnest、Sittisak Oekchuae、Duangduan Chaiyaveij、Jutatip Boonsombat、Somsak Ruchirawat
DOI:10.1016/j.tet.2022.132920
日期:2022.8
An improved synthetic strategy for 1-substituted 4-H phthalazines using a convenient, three-step reaction sequence under mild conditions is described. The protocol involves condensation of hydrazine hydrate with o-ketobenzaldehydes derived through the Pb(OAc)4 oxidation of the N-acylhydrazones of salicylaldehydes. This pathway is of high practical value since a wide variety of substituted acylhydrazides
描述了在温和条件下使用方便的三步反应序列改进 1-取代 4-H 酞嗪的合成策略。该协议涉及水合肼与通过水杨醛的N-酰基腙的 Pb(OAc) 4氧化衍生的邻酮苯甲醛的缩合。该途径具有很高的实用价值,因为种类繁多的取代酰肼和水杨醛是N-酰基腙是可商购的。此外,三步序列可以扩大规模,无需中间纯化,以高产率提供广泛的产品。1-苯基 4-H 酞嗪是一种多功能化合物,可提供多种酞嗪类似物,包括血管扩张剂 MY5445。