1,4-Dioxene in organic synthesis: Rapid access to the oxabicyclo[4.2.1]nonene system
Abstract
Oxidation of 2,3-disubstituted 1,4-dioxenes 3 with m-chloroperbenzoic acid in methanol followed by nucleophilic addition of allyltrimethylsilane in the presence of TiCl4 afforded dienes 5, which have been converted to oxabicyclo[4.2.1] nonenes 8 in excellent yield by olefin ring-closing metathesis reaction.