Metal- and photosensitizer-free cross-dehydrogenative coupling through photoinduced energy transfer
作者:Bo Liu、Qiong Wang、Bin Cheng、Taimin Wang、Hongze Liao、Hou-Wen Lin
DOI:10.1039/d3gc03983h
日期:——
photosensitizer-free cross-dehydrogenative coupling (CDC) systems to promote the cleavage of strong C(sp3)–H bonds through a distinct non-photoredox engaged hydrogen atom transfer (HAT) process. Mechanistic experiments indicate that this reaction predominantly proceeds through an energy transfer mechanism from excited-state heteroarenes to peroxides, with the direct irradiation of peroxides serving as a supplementary
我们开发了不含金属和光敏剂的交叉脱氢偶联(CDC)系统,通过独特的非光氧化还原参与氢原子转移(HAT)过程促进强C(sp 3 )–H键的裂解。机理实验表明,该反应主要通过从激发态杂芳烃到过氧化物的能量转移机制进行,过氧化物的直接照射作为促进O-O键均裂的补充和次要途径。生成的氧自由基从底物 C-H 键发生 HAT,然后将所得烷基加成到杂芳烃上,促进关键 C-C 键的形成。通过对一系列过氧化物的筛选,得出过苯甲酸叔丁酯(TBPB)和杂芳烃是最佳能量传递对的结论。除了效率和步骤经济性之外,这种方法还具有环境优势,使其适合药物和类药物分子的后期功能化,同时容纳广泛的官能团。