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
已经开发了合成异香豆素衍生物的通用方法。将双(5-R-2-呋喃基)甲基苯甲酸(R =甲基,乙基)进行环化,然后在甲醇中用氯化氢处理,将其环化为四环异色烯-1-酮衍生物。已经表明,通过改变氢的浓度,可以选择性地获得中间体4-(5-R-呋喃-2-基)-3-(3-氧代-3-R-丙基)-异亚甲基-1-酮。氯化物和反应时间。在R =叔丁基的情况下,无论反应如何,仅分离出相应的4- [5-(叔丁基)-2-呋喃基] -3-(4,4-二甲基-3-氧戊基)-1-异壬酮。情况。