Isoquinolone derivatives via a furan recyclization reaction
作者:Artem S. Dmitriev、Vladimir T. Abaev、Wolfgang Bender、Alexander V. Butin
DOI:10.1016/j.tet.2007.06.114
日期:2007.9
A new approach to the synthesis of isoquinolone derivatives has been developed. It is based on the protolytic recyclization of amides of 2-carboxybenzylfurans. It was shown that the reaction proceeds via formation of allylic alcohols of isoquinolone series, which under acidic conditions undergo isomerization into the corresponding ketones. A new condensed heterocyclicsystem of furo[2′,3′:3,4]cyclohepta[1
已经开发了合成异喹诺酮衍生物的新方法。它基于2-羧基苄基呋喃的酰胺的蛋白水解再循环。已表明反应是通过形成异喹诺酮系列的烯丙醇进行的,该烯丙基醇在酸性条件下经历异构化成相应的酮。合成了呋喃[2',3':3,4]环庚[1,2 - c ]异喹啉-8(6 H)-one的一个新的稠合杂环系统。
Furan ring opening - isocoumarine ring closure: A recyclization reaction of 2-carboxyaryldifurylmethanes
作者:Vladimir T. Abaev、Artem S. Dmitriev、Sergey A. Podelyakin、Alexander V. Butin、Andrey V. Gutnov
DOI:10.1002/jhet.5570430510
日期:2006.9
A general method for the synthesis of isocoumarine derivatives has been developed. Bis(5-R-2-furyl)methylbenzoic acids (R = methyl, ethyl) underwent recyclization and subsequent cyclization into tetracyclic isochromene-1-one derivatives under treatment with hydrogen chloride in methanol. It has been shown that intermediate 4-(5-R-furan-2-yl)-3-(3-oxo-3-R-propyl)-isochromene-1-ones can be obtained selectively
As part of our ongoing interest in the synthesis of benz-annelated heterocycles from O-substituted benzylfurans, recyclization of [ O-(hydroxymethyl)aryl]difurylmethanes was studied. It was shown that, under acidic conditions, the O-hydroxymethyl group in these compounds acts as a nucleophile and tetracyclic isochromene derivatives are formed via a recyclization-cyclization tandem sequence. Alternatively