Site‐Selective C−H Alkenylation of N‐Heteroarenes by Ligand‐Directed Co/Al and Co/Mg Cooperative Catalysis**
作者:Yuri Saito、Jun Kikuchi、Chen Wang、Naohiko Yoshikai
DOI:10.1002/anie.202301006
日期:——
oxide bifunctional ligand, have been developed for site-selective C−H alkenylation of N-heteroarenes with alkynes. Pyridines, pyridones, and imidazo[1,2-a]pyridines are efficiently alkenylated at the C−H site proximal to the Lewis basic nitrogen or oxygen. A ligand-to-ligand hydrogen transfer process is proposed as a general mechanism of these C−H activations.
Co/Al- 和 Co/Mg 双金属催化剂,由膦/仲氧化膦双功能配体支持,已被开发用于 N-杂芳烃与炔烃的位点选择性 C-H 烯基化。吡啶、吡啶酮和咪唑并 [1,2- a ] 吡啶在靠近路易斯碱性氮或氧的 C-H 位点被有效地烯基化。提出了配体到配体的氢转移过程作为这些 C-H 活化的一般机制。