Synthesis of 5H-furo[3′,2′ : 6,7][1]benzopyrano[3,4-c]pyridin-5-ones and 8H-pyrano[3′,2′ : 5,6]benzofuro[3,2-c]pyridin-8-ones (pyridopsoralens)
作者:Jacqueline Moron、Chi Hung Nguyen、Emile Bisagni
DOI:10.1039/p19830000225
日期:——
5H-Furo[3′,2′ : 6,7][1]benzopyrano[3,4-c]pyridin-5-ones (pyrido[3,4-c]psoralens)(3) have been obtained by the von Pechmann reaction starting from 6-hydroxy-2,3-dihydrobenzofuran acetates plus 1-benzyl-3-ethoxycarbonylpiperidin-4-one and subsequent dehydrogenation. The synthesis of their 8H-pyrano[3′,2′ : 5,6]benzofuro[3,2-c]pyridin-8-one isomers (14) and (17) was achieved by two ways using: (i) ring
通过以下方法获得了5 H -Furo [3',2':6,7] [1]苯并吡喃并[3,4- c ]吡啶-5-酮(吡啶并[3,4- c ]补骨脂素)(3)。 von Pechmann反应从6-羟基-2,3-二氢苯并呋喃乙酸酯加1-苄基-3-乙氧基羰基哌啶-4-酮开始,然后进行脱氢反应。它们的8 H-吡喃并[3',2':5,6]苯并呋喃[3,2- c ]吡啶8-异构体(14)和(17)的合成通过以下两种方式实现:(i)闭环4-甲酰基-3-羟基-2-甲基苯并呋喃[3,2- c ]吡啶,和(ii)哌啶酮O-(4,7-二甲基香豆素-7-基)肟衍生物的环化和芳构化。