Mechanistic Study on the Ruthenium-Catalyzed Direct Amination of Alcohols

被引：50

作者：

Pingen, Dennis ^{[1
]}

Lutz, Martin ^{[2
]}

Vogt, Dieter ^{[1
]}

机构：

[1] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland

[2] Univ Utrecht, Fac Sci, Bijvoet Ctr Biomol Res, NL-3584 CH Utrecht, Netherlands

来源：

ORGANOMETALLICS | 2014年 / 33卷 / 07期

关键词：

BORROWING HYDROGEN; SELECTIVE SYNTHESIS; SECONDARY ALCOHOLS; HYDRIDE COMPLEXES; XANTPHOS CATALYST; PRIMARY AMINES; AMMONIA; ACTIVATION; DEHYDROGENATION; EFFICIENT;

D O I：

10.1021/om4011998

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The Ru-catalyzed direct amination of alcohols with ammonia was investigated for the RuHCl(CO)(PPh3)(3)/Xantphos system in order to gain mechanistic insight. For several Ru(II) precursor complexes the influence of different additives on catalytic performance was investigated. NMR studies revealed that the reaction of RuHCl(CO)(PPh3)(3)/Xantphos with the alcohol in the presence of a strong base initially formed an inactive dihydrido Ru species. However, by addition of a ketone, the dihydride was (re)activated, where the corresponding imine is the actual activator, formed by immediate condensation of the ketone with ammonia In the absence of a base, added ketone significantly enhanced catalyst activity. Catalytically inactive RuCl2(PPh3)(3) could be activated by base, demonstrating that also complexes without the CO ligand give active catalysts. On the basis of these observations a mechanism was proposed, closely related to known transfer hydrogenation mechanisms.

引用

页码：1623 / 1629

页数：7

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