A new approach to dihydrobenzofurans by intramolecular trapping of benzynes by hydroxyl functions
作者:Michael A. Birkett、David W. Knight、Michael B. Mitchell
DOI:10.1016/s0040-4039(00)91836-7
日期:1993.10
The adducts 3, derived from condensations of the 1-aminobenzotriazole dianion 2 and aldehydes or ketones, are converted into the corresponding benzynes upon exposure to either N-bromosuccinimide or lead(IV) acetate; intramolecular trapping by the hydroxyl group then leads to the dihydrobenzofurans 4, 7, 8 and 9 in 38 75% isolated yields.