2-Carboxyaryldifurylmethanes in Synthesis of Ketones in the Isocoumarin Series
作者:A. S. Dmitriev、S. A. Podelyakin、V. T. Abaev、A. V. Butin
DOI:10.1007/s10593-005-0303-4
日期:2005.9
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