Sensitized Photooxidation of
<i>Ortho</i>
‐Prenyl Phenol: Biomimetic Dihydrobenzofuran Synthesis and Total
<scp>
<sup>1</sup>
O
<sub>2</sub>
</scp>
Quenching
<sup>†</sup>
作者:Shakeela Jabeen、Goutam Ghosh、Lloyd Lapoot、Andrés M. Durantini、Alexander Greer
DOI:10.1111/php.13689
日期:2023.3
The sensitized photooxidation of ortho-prenyl phenol is described with evidence that solvent aproticity favors the formation of a dihydrobenzofuran [2-(prop-1-en-2-yl)-2,3-dihydrobenzofuran], a moiety commonly found in natural products. Benzene solvent increased the total quenching rate constant (kT) of singlet oxygen with prenyl phenol by ~10-fold compared to methanol. A mechanism is proposed with
描述了邻异戊二烯苯酚的敏化光氧化,有证据表明溶剂非质子性有利于二氢苯并呋喃 [2-(prop-1-en-2-yl)-2,3-二氢苯并呋喃] 的形成,这是一种常见于天然产物中的部分. 与甲醇相比,苯溶剂使单线态氧与异戊二烯酚的总猝灭速率常数 ( k T ) 增加了约 10 倍。提出了一种机制,由于与苯酚 OH 基团形成氢键,单线态氧优先添加到异戊烯位点,这导致从单线态氧“烯”反应向二氢苯并呋喃作为主要产物的发散。该反应是一个混合光氧化系统,因为环氧化物是由 I 型敏化光氧化产生的。