Uncovering the On-Pathway Reaction Intermediates for Metal-Free Atom Transfer Radical Addition to Olefins through Photogenerated Phenalenyl Radical Anion
作者:Paramita Datta、Debojyoti Roy、Divya Jain、Shiv Kumar、Swagata Sil、Anup Bhunia、Jyotishman Dasgupta、Swadhin K. Mandal
DOI:10.1021/acscatal.3c05688
日期:2024.3.1
powerful approach for atom transfer radical addition (ATRA) while generating the desired intermediates that are otherwise difficult to access with traditional methods. However, photoredox ATRA with organic photosensitizers is rare, giving an opportunity for metal-free routes to complex organic synthesis. Here, we demonstrate exquisite control of product selectivity for addition reactions of in situ generated
光氧化还原催化已成为原子转移自由基加成 (ATRA) 的一种强大方法,同时生成传统方法难以获得的所需中间体。然而,具有有机光敏剂的光氧化还原 ATRA 很少见,这为复杂有机合成的无金属路线提供了机会。在这里,我们展示了通过 H/I-ATRA 对原位生成的卡宾加成反应的产物选择性进行精确控制,以形成环丙烷化或相应的加氢烷基化产物。稳态和时间分辨光谱工具的组合确定了驱动光催化的反应性苯酚自由基阴离子的瞬时形成。动力学同位素测量和自由基捕获方法绘制了苯乙烯基烃的环丙烷化和加氢烷基化反应的完整机械循环。我们的多组分 H/I-ATRA 方法采用光生苯酚自由基阴离子,显示出包含生物活性分子的高官能团耐受性。