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
Furan ring opening–isochromene ring closure: a new approach to isochromene ring synthesis
作者:Alexander V. Butin、Vladimir T. Abaev、Vladimir V. Mel’chin、Artem S. Dmitriev
DOI:10.1016/j.tetlet.2005.09.056
日期:2005.11
A new approach toward the synthesis of 1H-isochromenes based on the recyclization of the furan ring in the corresponding ortho-hydroxymethylbenzylfurans is described.