First Efficient Two-Step/One-Pot Zirconium (IV)isopropoxide–Mediated Reductive Amination of Carbonyl Compounds
作者:Cyril Pieri、Jean Michel Brunel
DOI:10.2174/1570180812666141215215120
日期:2015.5.7
An efficient method for the synthesis of various primary and secondary amines through a zirconium(IV) isopropoxide–mediated reductive amination reaction of aldehydes and ketones is reported. A series of different aldehydes, ketones and amines were used leading to the expected amino products in moderate to excellent yields. The mechanistic rationale of this reaction has been postulated through the formation
Structure, reactivity and catalytic properties of manganese-hydride amidate complexes
作者:Yujie Wang、Shihan Liu、Haobo Yang、Hengxu Li、Yu Lan、Qiang Liu
DOI:10.1038/s41557-022-01036-6
日期:2022.11
amidate intermediate has not yet been isolated. Here we present the synthesis, isolation and reactivity of a metal-hydride amidate complex (HMn–NLi). Kinetic studies show that the rate of hydride transfer from HMn–NLi to a ketone is 24-fold higher than that of the corresponding amino metal-hydride complex (HMn–NH). Moreover, the hydrogenation of N-alkyl-substituted aldimines was realized using HMn–NLi
Designing New Magnesium Pincer Complexes for Catalytic Hydrogenation of Imines and <i>N</i>-Heteroarenes: H<sub>2</sub> and N–H Activation by Metal–Ligand Cooperation as Key Steps
difficulty in heterolytic cleavage of the H–H bond. Employing aromatization/de-aromatization metal–ligand cooperation (MLC) highly enhances the H2 activationprocess, offering an efficient approach for the hydrogenation of unsaturated molecules catalyzed by main-group metals. Herein, we report a series of new magnesium pincer complexes prepared using PNNH-type pincerligands. The complexes were characterized
利用主族金属替代过渡金属进行均相催化成为近年来的研究热点。然而,由于H-H键的异裂解困难,它们在催化氢化中的应用较少。采用芳构化/去芳构化金属-配体合作 (MLC) 可显着增强 H 2活化过程,为主族金属催化的不饱和分子氢化提供了一种有效的方法。在此,我们报告了一系列使用 PNNH 型钳配体制备的新型镁钳络合物。通过核磁共振和 X 射线单晶衍射对配合物进行了表征。H 2的可逆激活开发了使用这些钳形络合物的 MLC 的 N-H 键。使用新的镁配合物,实现了醛亚胺和酮亚胺的均匀催化氢化,以优异的收率提供仲胺。对照实验和 DFT 研究表明,涉及 MLC 的途径有利于氢化反应。此外,该高效催化扩展到喹啉和其他N-杂芳烃的选择性加氢,首次展示了早期主族金属配合物均相催化N-杂芳烃加氢的实例。该研究为镁化合物催化的C=N键加氢提供了新的策略,丰富了主族金属催化的研究。
Okamoto, Hidenori; Kato, Shozo; Ogasawara, Masaru, Agricultural and Biological Chemistry, 1991, vol. 55, # 11, p. 2733 - 2736