Cationic DABCO-Based Catalyst for Site-Selective C–H Alkylation via Photoinduced Hydrogen-Atom Transfer
作者:Akira Matsumoto、Masanori Yamamoto、Keiji Maruoka
DOI:10.1021/acscatal.1c05484
日期:2022.2.4
A series of hydrogen-atom transfer (HAT) catalysts based on the readily available and tunable 1,4-diazabicyclo[2.2.2]octane (DABCO) structure was designed, and their photoinduced HAT catalysis ability was demonstrated. The combination of our HAT catalyst with an acridinium-based organophotoredox catalyst enables efficient and site-selective C–H alkylation of substrates ranging from unactivated hydrocarbons
设计了一系列基于容易获得且可调的 1,4-二氮杂双环[2.2.2]辛烷 (DABCO) 结构的氢原子转移 (HAT) 催化剂,并证明了它们的光诱导 HAT 催化能力。我们的 HAT 催化剂与基于吖啶的有机光氧化还原催化剂相结合,可以对从未活化的碳氢化合物到复杂分子的底物进行高效和位点选择性的 C-H 烷基化。值得注意的是,具有与氮原子相邻的附加取代基的 HAT 催化剂进一步提高了位点选择性。机理研究表明,催化剂的N取代基起着至关重要的作用,有助于生成双阳离子胺自由基作为 HAT 过程的活性物质。