reductive monoalkyl- ation of amines and amine derivatives with aldehydes is reported. Treatment of aldehydes with primary amines, secondaryamines, O- trimethylsilylhydroxylamine, and N,N-dimethylhydrazine in lithi- um perchlorate/diethylether and trimethylsilyl chloride, followed by BH3·NEt3 reduction, and straightforward workup afforded sec- ondary amines, tertiary amines, N-substituted hydroxylamines
and green method for the selectivesynthesis of tertiary amines has been developed that involves iridium-catalyzed alkylation of various primary amines with aromatic or aliphatic alcohols. Notably, the catalytic protocol enables this transformation in the absence of additional base and solvent. Furthermore, the alkylation of nitrobenzene with primary alcohol to tertiary amine has also been achieved by
Reduction of amides to amines via catalytic hydrosilylation by a rhodium complex
作者:Ryoichi Kuwano、Masatoshi Takahashi、Yoshihiko Ito
DOI:10.1016/s0040-4039(97)10804-8
日期:1998.2
Reduction of a wide range of tertiary amides with 2 molar equivalents of diphenylsilane was promoted by 0.1 mol% of RhH(CO)(PPh3)3 at room temperature, affording the corresponding tertiary amines in high yields. The synthetic utility is demonstrated by chemoselective reductions of amides having functional groups such as ester and epoxy groups which are not tolerated by the conventional reductions with
Aminomethylation of organic halides promoted by zinc in protic medium
作者:Idália H.S. Estevam、Margarete F. da Silva、Lothar W. Bieber
DOI:10.1016/j.tetlet.2005.08.139
日期:2005.10
halides undergo smooth aminomethylation by secondary amines and aqueousformaldehyde promoted by metallic zinc under copper(I) catalysis. Good to excellent yields are obtained with primary, secondary, and tertiary iodides, allylic, propargylic, and benzylic bromides and with α-bromoesters. In most cases, DMSO is the best solvent, but dioxane is preferable for some more reactive halides. Additional experiments
The direct reductive N-benzylation of imines by reaction with benzyl bromide derivatives, in the presence of [RuCl2(p-cymene)]2catalyst and PhSiH3, is performed under mild conditions without additional base. This reaction proceeds by a tandem iminehydrosilylation/nucleophilic substitution with benzyl bromide derivatives to result the tertiary amines.