Facile Chemoselective synthesis of 2-(2-(Methoxycarbonyl)-3-oxo-2,3-dihydrobenzofuran-2-yl)benzoic acids and 3<i>H</i>,3’<i>H</i>-Spiro[benzofuran-2,1′-isobenzofuran]-3,3′-dione derivatives
作者:Neda Firoozi、Zohreh Roshan、Mohammad Reza Mohammadizadeh
DOI:10.1002/aoc.3963
日期:2018.1
derivatives of 4b,9b–dihydroxyindeno[1,2‐b]benzofuran‐10‐one have been investigated in detail using lead(IV) acetate in acetic acid under reflux conditions and periodic acid in aqueous ethanol at room temperature. We realized that during the first 5–15 minutes of the oxidation reactions in lead(IV) acetate/acetic acid system, 3H,3’H‐spiro[benzofuran‐2,1′‐isobenzofuran]‐3,3′‐dione derivatives have been
在回流条件下,使用乙酸铅(IV)在乙酸中,在室温下于乙醇水溶液中,对4b,9b-二羟基茚并[1,2- b ]苯并呋喃-10-one的某些衍生物的氧化进行了详细研究。我们认识到,在第一5-15分钟铅(IV)乙酸盐/乙酸系统,3氧化反应的ħ,3' ħ -螺[苯并呋喃-2,1'-异苯并呋喃] -3,3'-二酮衍生物是选择性化学合成的,而如果将反应混合物再搅拌3小时,则主要产物将是2-(2-(甲氧羰基)-3-氧代-2,3-二氢苯并呋喃-2-基)苯甲酸。此外,高碘酸在室温下氧化4b,9b-二羟基茚并[1,2 - b ]苯并呋喃-10-酮(H 5IO 6),导致3的形成ħ,3' ħ以良好至优异的产率-螺[苯并呋喃-2,1'-异苯并呋喃] -3,3'-二酮衍生物。