Highly Chemoselective Reduction of Amides to Amines over a Ruthenium‐Molybdenum Bimetallic Catalyst

Highly Chemoselective Reduction of Amides to Amines over a Ruthenium‐Molybdenum Bimetallic Catalyst
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在钌钼双金属催化剂上将酰胺高度化学选择性还原为胺

DOI:
10.1002/slct.202203030
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发表时间:
2022-10
期刊:
影响因子:
2.1
通讯作者:
Aiqin Wang
Aiqin Wang
中科院分区:
化学4区
文献类型:
--
作者:
Yue Zhang;Fan Zhang;Lin Li;Fei Liu;Aiqin Wang

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酰胺的化学选择性还原在精细化学品和中间体的合成中具有重要意义。然而,由于氮孤对与羰基反键轨道重叠而形成的高度稳定的酰胺键,对开发合适的非均相催化剂造成了很大的限制。在这项工作中,我们开发了一种高效、稳健的Ru - (0.2)Mo/ tio2催化剂,用于伯胺的化学选择性还原。结果表明,该催化剂在160℃下反应12 h后,伯胺的转化率为83.1%,选择性为80%。此外,该催化剂还具有良好的可重复使用性和底物多样性。催化剂的表征表明,Ru促进了Mo6+还原为Mo5+和Mo0,生成的低配位Mo5+负责酰胺的C=O键的选择性活化,而RuMo合金促进了氢的活化。
The chemoselective reduction of amides is important in the synthesis of fine chemicals and inter‐mediates. However, the highly stable amide bond due to the orbital overlap between the nitrogen lone pair and the antibonding orbital of the carbonyl group poses a significant limitation in developing suitable heterogeneous catalysts. In this work, we have developed a highly efficient and robust Ru‐(0.2)Mo/TiO2catalyst for the chemoselective reduction of primary amides. As a consequence, the catalyst afforded 83.1 % conversion with 80 % selectivity of the primary amine after reaction for 12 h for the HDO of cyclohexanecarboxamide at 160 °C. Moreover, the catalyst also presented excellent reusability and substrate diversity. The characterizations of the catalyst revealed that Ru promoted the reduction of Mo6+to Mo5+and Mo0, and the resultant low‐coordinated Mo5+is responsible for the selective activation of the C=O bond of the amide, while RuMo alloy promoted the activation of hydrogen.
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