Simple and Efficient Generation of Aryl Radicals from Aryl Triflates: Synthesis of Aryl Boronates and Aryl Iodides at Room Temperature
作者:Wenbo Liu、Xiaobo Yang、Yang Gao、Chao-Jun Li
DOI:10.1021/jacs.7b03538
日期:2017.6.28
Despite the wide use of aryl radicals in organic synthesis, current methods to prepare them from aryl halides, carboxylic acids, boronic acids, and diazonium salts suffer from limitations. Aryl triflates, easily obtained from phenols, are promising aryl radical progenitors but remain elusive in this regard. Inspired by the single electron transfer process for aryl halides to access aryl radicals, we developed
尽管在有机合成中广泛使用芳基,但目前从芳基卤化物、羧酸、硼酸和重氮盐制备芳基的方法存在局限性。芳基三氟甲磺酸酯很容易从苯酚中获得,是很有前途的芳基自由基祖体,但在这方面仍然难以捉摸。受芳基卤化物获得芳基自由基的单电子转移过程的启发,我们开发了一种简单有效的方案,将芳基三氟甲磺酸酯转化为芳基自由基。我们的成功在于利用碘化钠作为光辅助的软电子供体。该策略能够在室温下以无过渡金属的方式以良好到高的产率大规模合成两种重要的有机分子,即芳基硼酸酯和芳基碘化物,具有广泛的官能团兼容性。