Ruthenium-catalyzed reduction of N-alkoxy- and N-hydroxyamides
摘要:
A ruthenium-catalyzed reduction of N-alkoxy- and N-hydroxyamides was found to afford corresponding amides in good to high yields. A simple RuCl3/Zn-Cu/alcohol system, without the addition of any other ligands, exhibited a high catalytic activity, and therefore the present reaction does not require a stoichiometric amount of metals or metal complexes as reductants. When beta-substituted-alpha,beta-unsaturated N-methoxyamides were employed as substrates, concurrent hydrogenation of the olefin moiety proceeded slowly with deprotection of the methoxy group. In the reduction of N-hydroxyamides, the alcoholic solvent was found to function as a hydrogen donor. (C) 2011 Elsevier B.V. All rights reserved.
<i>N</i>-Methoxyamide: An Alternative Amidation Reagent in the Rhodium(III)-Catalyzed C–H Activation
作者:Chao Zhou、Junqi Zhao、Weicong Guo、Jijun Jiang、Jun Wang
DOI:10.1021/acs.orglett.9b03357
日期:2019.12.6
In the field of transition-metal-catalyzed C-Hactivation, N-methoxyamides are widely used as C-Hactivation substrate. Unexpectedly, in this work N-methoxyamides were found to work as efficient amidation reagents in the rhodium(III)-catalyzedC-Hactivation with boric acid as a cocatalyst. This reaction features broad substrate scope and good yields.
Enantioselective Organocatalytic Desymmetrization of Cyclopentene-1,3-diones through Formal C(sp<sup>2</sup>)–H Amidation
作者:Hao Liang、Xiaotong Zhou、Liyao Zheng、Jun Wang
DOI:10.1021/acs.joc.9b01678
日期:2019.9.6
An enantioselective organocatalytic desymmetrization of 2,2-disubstituted cyclopentene-1,3-diones via a formal C(sp2)–Hamidation is reported. The reaction was carried out with N-methoxy amide as the nitrogen source and commercially available cinchonidine as the catalyst under mild reaction conditions, releasing methanol as the only byproduct. It provides an efficient way to synthesize enantioenriched
Ruthenium-catalyzed reduction of N-alkoxy- and N-hydroxyamides
作者:Hiroko Fukuzawa、Yasuyuki Ura、Yasutaka Kataoka
DOI:10.1016/j.jorganchem.2011.08.026
日期:2011.11
A ruthenium-catalyzed reduction of N-alkoxy- and N-hydroxyamides was found to afford corresponding amides in good to high yields. A simple RuCl3/Zn-Cu/alcohol system, without the addition of any other ligands, exhibited a high catalytic activity, and therefore the present reaction does not require a stoichiometric amount of metals or metal complexes as reductants. When beta-substituted-alpha,beta-unsaturated N-methoxyamides were employed as substrates, concurrent hydrogenation of the olefin moiety proceeded slowly with deprotection of the methoxy group. In the reduction of N-hydroxyamides, the alcoholic solvent was found to function as a hydrogen donor. (C) 2011 Elsevier B.V. All rights reserved.