A New Preparative Route to Substituted Dibenzofurans by Benzannulation Reaction. An Application to the Synthesis of Cannabifuran
作者:Stefano Serra、Claudio Fuganti
DOI:10.1055/s-2003-42037
日期:——
A new regioselective pathway to substituted dibenzofuran derivatives is described here. According to this procedure substituted 1-acetoxy-3-alkoxycarbonyl dibenzofurans are obtained by treatment of 6-(2-methoxyaryl)-3-alkoxycarbonylhex-3-en-5-ynoic acids with acetic anhydride in the presence of sodium acetate. The latter acids are prepared from the easily available substituted o-iodo-anisoles by Sonogashira