Well‐defined Nickel P
<sub>3</sub>
C Complexes as Hydrogenation Catalysts of
<i>N</i>
‐Heteroarenes Under Mild Conditions
作者:Klaudia Michaliszyn、Ekaterina S. Smirnova、Alberto Bucci、Vlad Martin‐Diaconescu、Julio Lloret Fillol
DOI:10.1002/cctc.202200039
日期:2022.6.8
Herein it is reported a straightforward path to the rare and difficult access of metal complexes with P3C ligands type and study their capacity as hydrogenation of quinolines.
本文报道了一条通往具有 P 3 C配体类型的稀有且难以获得的金属配合物的直接途径,并研究了它们作为喹啉氢化的能力。
Balancing the Seesaw in Mn-Catalyzed N-Heteroarene Hydrogenation: Mechanism-Inspired Catalyst Design for Simultaneous Taming of Activation and Transfer of H<sub>2</sub>
作者:Ravi Kumar、Madhusudan K. Pandey、Anirban Bhandari、Joyanta Choudhury
DOI:10.1021/acscatal.2c06405
日期:——
various challenging transformations. Among several classes of organic substrates, including amides, ketones, carbamates, urea-derivatives, (cyclic) carbonates/polycarbonates, CO2, and CO2 derivatives, N-heteroarene hydrogenation using a Mn-based system is severely underdeveloped. Only a handful of reports are known in the literature, which mainly use expensive phosphine-based ligand systems for designing
最近,锰催化的氢化反应因其在各种具有挑战性的转化中的重要性而受到广泛关注。在几类有机底物中,包括酰胺、酮、氨基甲酸酯、尿素衍生物、(环状)碳酸酯/聚碳酸酯、CO 2和 CO 2衍生物,使用 Mn 基系统的 N-杂芳烃氢化反应严重不足。文献中只有少数报道是已知的,主要是使用昂贵的膦基配体体系来设计有效的锰催化剂。从机理上讲,对于已知的钳形 Mn 催化剂,H 2活化步骤由典型的金属-配体双功能机制通过所谓的“Mn-氨基”/“Mn-氨基”平台促进,而 H 2- 转移步骤(以氢化物和质子转移的形式)是由精心设计的立体电子调谐的 P- 和/或 N- 供体配体连接在 Mn 中心触发的。有趣的是,这两个步骤,即 H 2 -activation 和 H 2-转移,通常由于金属中心的相反立体电子需求而抵消,并且在这两个步骤的情况下,现有的 PNP-Mn 和 NNP-Mn 催化剂确实遭受能量失衡。通过合理分析
Efficient reduction of quinoxaline compounds using zinc chloride—sodium borohydride system
Reagent system NaBH4—ZnCl2 was found to be suitable for the reduction of various substituted quinoxalines to obtain corresponding 1,2,3,4-tetrahydro derivatives. The reduction proceeds quickly under mild reaction conditions. The procedure is convenient and can be applied for a wide scope of substrates.
The search for efficient molecular hydrogenprecursors and their catalytic exploration is necessary for the evolution of catalytic transfer hydrogenation. Methyl formate (MF) having high hydrogen content still remains unexplored for such transformations. Herein, we disclosed a bifunctional Ir(III)-complex catalyzed chemoselective TH protocol for N-heteroarenes and azoarenes using MF. A variety of substrates