在重要的化学反应中具有高活性和选择性的纳米结构和可重复使用的 3d 金属催化剂是非常需要的。在这里,开发了一种钴催化剂,用于通过还原胺化反应合成伯胺,使用氢气作为还原剂,易处理的氨水溶解在水中,作为氮源。催化剂在非常温和的条件下运行(1.5 mol% 催化剂负载,50 °C 和 10 bar H 2压力)并优于市售的贵金属催化剂(Pd、Pt、Ru、Rh、Ir)。观察到广泛的范围和非常好的官能团耐受性。高活性的关键似乎是使用的载体:一种 N 掺杂的无定形碳材料,具有小的和乱层无序的石墨域,它是微孔的,具有双峰尺寸分布,并且在孔中具有基本的 NH 官能团。
seven novel NImNHP‐type pincer imidazolylphosphineruthenium complexes has been synthesized and fully characterized. The use of hydrogenation of benzonitrile as a benchmark test identified [RuHCl(CO)(NImNHPtBu)] as the most active catalyst. With its stable Ru−BH4 analogue, in which chloride is replaced by BH4, a broad range of (hetero)aromatic and aliphaticnitriles, including industrially interesting
已合成并充分表征了一系列七个新型的N Im N H P型钳型咪唑基膦膦钌配合物。使用苯甲腈加氢作为基准测试,确定了[RuHCl(CO)(N Im N H P t Bu)]是最具活性的催化剂。凭借其稳定的Ru-BH 4类似物(其中氯化物被BH 4替代),已在温和且无碱的条件下氢化了多种(杂)芳族和脂肪族腈,包括工业上有用的己二腈。
IMIDAZOLE CARBOXAMIDES
申请人:Khilevich Albert
公开号:US20100016373A1
公开(公告)日:2010-01-21
The present invention provides certain imidazole carboxamide derivatives, pharmaceutical compositions thereof, methods of using the same and processes for preparing the same.
Cyclic (Alkyl)(amino)carbene Ligand-Promoted Nitro Deoxygenative Hydroboration with Chromium Catalysis: Scope, Mechanism, and Applications
作者:Lixing Zhao、Chenyang Hu、Xuefeng Cong、Gongda Deng、Liu Leo Liu、Meiming Luo、Xiaoming Zeng
DOI:10.1021/jacs.0c12318
日期:2021.1.27
Transition metal catalysis that utilizes N-heterocycliccarbenes as noninnocent ligands in promoting transformations has not been well studied. We report here a cyclic (alkyl)(amino)carbene (CAAC) ligand-promoted nitro deoxygenative hydroboration with cost-effective chromium catalysis. Using 1 mol % of CAAC-Cr precatalyst, the addition of HBpin to nitro scaffolds leads to deoxygenation, allowing for
Deoxygenative hydroboration of primary, secondary, and tertiary amides: Catalyst‐free synthesis of various substituted amines
作者:Jaeeun Yi、Hyun Tae Kim、Ashok Kumar Jaladi、Duk Keun An
DOI:10.1002/bkcs.12438
日期:2022.1
less reactive functional groups under catalyst-free conditions is an interesting aspect and requires a typical protocol. Herein, we report the synthesis of various primary, secondary, and tertiary amines through hydroboration of amides using pinacolborane under catalyst-free and solvent-freeconditions. The deoxygenative hydroboration of primary and secondary amides proceeded with excellent conversions