Diethylene glycol-functionalized imidazo[1,5-a]pyridin-3-ylidenes (DEG-ImPy) have been developed as bifunctional N-heterocyclic carbene ligands. The DEG-ImPy Cu(I) complexes efficiently catalyzed the direct C–H carboxylation of benzoxazole with CO2, showing higher isolated yields than those with the N,N′-(2,6-diisopropylphenyl)imidazolylidene Cu catalyst.
二甘醇官能化的
咪唑并[1,5 - a ]
吡啶-3-
吡咯(
DEG-ImPy)已开发为双官能N杂环卡宾
配体。
DEG-ImPy Cu(I)配合物有效地催化了CO 2对
苯并恶唑的直接C–H羧化反应,显示出比N,N '-(2,6-二异丙基苯基)
咪唑基亚苄基Cu催化剂更高的分离产率。