A Novel Synthetic Route to 2-Arylalkanoic Acids by a Ruthenium-Catalyzed Chemoselective Oxidation of Furan Rings
作者:Keitaro Ishii、Masahiro Noji、Haruka Sunahara、Ken-ichi Tsuchiya、Tôru Mukai、Ayako Komasaka
DOI:10.1055/s-0028-1083222
日期:2008.12
Friedel-Crafts alkylation of 2-methylfuran with 1-arylalkanols without employing anhydrous conditions. The chemoselective oxidation of the furan ring in 1-arylalkylfurans to carboxylic acid was then investigated. In a solvent system of hexane-EtOAc/H 2 O (1:3:4), the furan ring was selectively oxidized with 7 equivalents of NaIO 4 by using 0.5 mol% RuCl 3 as catalyst to give 2-arylalkanoic acids in good yields
描述了一种从 1-芳基烷醇高效两步合成 2-芳基烷酸的方法。首先,通过金属三氟甲磺酸盐催化 2-甲基呋喃与 1-芳基烷醇在无水条件下的傅-克烷基化反应,以高收率合成 1-芳基烷基呋喃衍生物。然后研究了 1-芳烷基呋喃中的呋喃环化学选择性氧化为羧酸。在己烷-EtOAc/H 2 O (1:3:4) 溶剂体系中,以 0.5 mol% RuCl 3 为催化剂,用 7 当量 NaIO 4 选择性氧化呋喃环,以良好收率得到 2-芳基链烷酸. 钌氧化的选择性由己烷-EtOAc的溶剂比控制。