在此,我们报道了第一个 Fe II催化的胺类有氧仿生氧化反应。这种氧化反应涉及几个电子转移步骤,受到呼吸链中生物氧化的启发。从胺到分子氧的电子转移由两个耦合催化氧化还原系统辅助,这降低了能垒并提高了氧化反应的选择性。铁氢转移络合物被用作底物选择性脱氢催化剂,同时双功能对苯二酚/钴希夫碱络合物作为混合电子转移介体。各种伯胺和仲胺在空气中被氧化成其相应的醛亚胺或酮亚胺,收率良好至优异。
Switchable imine and amine synthesis catalyzed by a tripodal ligand-supported well-defined cobaltcomplex is presented herein. A large variety of primary alcohols and amines were selectively converted to imines or amines in good to excellent yields. It is discovered that the base plays a crucial role on the selectivity. A catalytic amount of base leads to the imine formation, while an excess loading
Direct reductivealkylation of amines with carboxylic acid is carried out by using an inexpensive, air‐stable cobalt/triphos catalytic system with molecular hydrogen as the reductant. This efficient synthetic method proceeds through reduction and condensation, followed by reduction of the in situ‐generated imine into the amine in a green catalytic process.
a reusable catalyst for C-/N-alkylation of alcohols with higher reaction efficiency and selectivity compared to individual components via its flexible binding sites, diverse hydrogen bond donor-acceptor fragments, rigidity, variable coordination mode, and cooperativity.