Bismuth(III) Triflate-Catalyzed Synthesis of Substituted 2-Alkenylfurans
作者:Dominik Nitsch、Thorsten Bach
DOI:10.1021/jo5009993
日期:2014.7.3
convergent synthesis of the title compounds is reported, which relies on a successive 2-fold SN′-type substitution reaction at methoxy-substituted propargylic acetates. The furan C3–C4 bond is presumably established by silylenolether attack at a propargylic cation intermediate. The resulting α-methoxyallene is intramolecularly substituted, leading to cyclization by displacement of the methoxy group (O–C2