Synthesis of Benzofurans with Remote Bromide Functionality by Domino “Ring-Cleavage-Deprotection-Cyclization” Reactions of 2-Alkylidenetetrahydrofurans with Boron Tribromide
作者:Esen Bellur、Peter Langer
DOI:10.1021/jo051079z
日期:2005.9.1
Bromination and subsequent Suzuki reactions of 2-alkylidenetetrahydrofurans, readily available by [3+2] cyclizations, afforded 1‘-(2‘ ‘-methoxyphenyl)-2-alkylidenetetrahydrofurans. Treatment of the latter with borontribromide and subsequent addition of water resulted in the chemoselective formation of functionalized benzofurans containing a remote bromide functionality. The products are formed by