871502-92-0Relevant articles and documents
Furan ring opening - Isocoumarine ring closure: A recyclization reaction of 2-carboxyaryldifurylmethanes
Abaev, Vladimir T.,Dmitriev, Artem S.,Gutnov, Andrey V.,Podelyakin, Sergey A.,Butin, Alexander V.
, p. 1195 - 1204 (2007/10/03)
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 by varying a concentration of the hydrogen chloride and reaction times. In the case of R = tert-butyl only corresponding 4-[5-(tert-butyl)-2-furyl]-3-(4,4-dimethyl-3-oxopentyl)-1-isochromenones were isolated regardless of the reaction conditions.
Furan ring opening-isochromene ring closure: A new approach to isochromene ring synthesis
Butin, Alexander V.,Abaev, Vladimir T.,Mel'chin, Vladimir V.,Dmitriev, Artem S.
, p. 8439 - 8441 (2007/10/03)
A new approach toward the synthesis of 1H-isochromenes based on the recyclization of the furan ring in the corresponding ortho- hydroxymethylbenzylfurans is described.
