Synthesis of 4-Isoxazolines via Visible-Light Photoredox-Catalyzed [3 + 2] Cycloaddition of Oxaziridines with Alkynes
作者:Gwang Seok Jang、Junggeun Lee、Jungseok Seo、Sang Kook Woo
DOI:10.1021/acs.orglett.7b03369
日期:2017.12.1
A method for [3 + 2] cycloaddition of oxaziridines with alkynes to form 4-isoxazolines via visible-light photoredox catalysis is described. This method is a greener, atom-economical reaction that tolerates various functional groups and provides good to excellent yield. Moreover, the cyclization products can be conveniently converted into tetrasubstituted allylic alcohols and enamines. A mechanistic
描述了通过可见光光氧化还原催化[3 + 2]恶唑烷与炔烃的环加成反应形成4-异恶唑啉的方法。该方法是一种绿色的,原子经济的反应,可耐受各种官能团,并具有良好的优良收率。此外,环化产物可以方便地转化为四取代的烯丙基醇和烯胺。机理研究表明,该反应涉及SET通过光氧化还原催化从恶唑烷原位生成硝酮。