Catalytic Hydrogenation of Amides to Amines under Mild Conditions
作者:Mario Stein、Bernhard Breit
DOI:10.1002/anie.201207803
日期:2013.2.18
Under (not so much) pressure: A general method for the hydrogenation of tertiary and secondary amides to amines with excellent selectivity using a bimetallic Pd–Re catalyst has been developed. The reaction proceeds under low pressure and comparatively low temperature. This method provides organic chemists with a simple and reliable tool for the synthesis of amines.
α-Metallierte amine durch deprotonierung aliphatischer N-methylamine
作者:Hubertus Ahlbrecht、Horst Dollinger
DOI:10.1016/s0040-4039(01)80155-6
日期:1984.1
Aliphatic N-methylamines can be deprotonated directly by means of s-butyllithium/potassium t-butoxide to give dialkylaminomethyl potassium or after metal exchange the more nucleophilic dialkylaminomethyl lithium.
Hydroformylation of terminal alkenes in alcohol solvents leads to the selective formation of the corresponding acetals. The Xantphos ligand gave the best results as well as acetal selectivities higher than 99% and linear/branched ratios of up to 52 were obtained. The scope of the reaction was studied. Acetals were found to be unreactive under hydroaminomethylation conditions.
A selective ruthenium-catalyzed water–gas shift/hydroformylation of internal olefins and olefin mixtures is reported. This novel domino reaction takes place through a catalytic water–gas shift reaction, subsequent olefin isomerization, followed by hydroformylation and reductive amination. Key to the success for the efficient one-pot process is the use of a specific 2-phosphino-substituted imidazole
A highlyregioselectivehydroaminomethylation of terminalolefins catalyzed by Rhcomplexes with 2, 2′, 6, 6′‐tetrakis ((diphenylphosphino)methyl)‐1, 1′‐biphenyl (Tetrabi) ligand has been developed. Up to 99 % amine selectivity, 168 linear/branched amine product ratio (n/i), and 97.4 % linearamine yield has been obtained at a substrate/rhodium precursor ratio (S/Rh) of 1000 with this methodology.