Efficient and Clean Gold-Catalyzed One-Pot Selective N-Alkylation of Amines with Alcohols
作者:Lin He、Xia-Bing Lou、Ji Ni、Yong-Mei Liu、Yong Cao、He-Yong He、Kang-Nian Fan
DOI:10.1002/chem.201001848
日期:2010.12.17
Atom‐efficient directN‐alkylation: An environmentally clean one‐pot selective N‐alkylation of amines with an equimolar amount of alcohols via a hydrogen autotransfer pathway was achieved over a titania‐supportedgoldcatalyst system in good to excellent yields without additive (see scheme).
Different from any other catalytic systems containing transition metals and additives, sodium hydroxide itself was found to be a unique and effective catalyst for the solvent-free synthesis of the secondary amines via the N-alkylation of amines with alcohols. For the reaction of aniline with benzyl alcohol, 99.6 mol% conversion of aniline and 99.5% selectivity of the product were achieved under optimal
catalytic system is applicable to the N-alkylation of both primary and secondary amines, and only harmless water is produced as co-product. A wide variety of secondary and tertiary amines can be synthesized with high atom economy under mild and less-toxic conditions. One-pot sequential N-alkylation leading to tertiary amines bearing three different substituents is also described.
Facile Synthesis and Isolation of Secondary Amines <i>via</i>
a Sequential Titanium(IV)-Catalyzed Hydroamination and Palladium-Catalyzed Hydrogenation
作者:Erica K. J. Lui、Laurel L. Schafer
DOI:10.1002/adsc.201500861
日期:2016.3.3
alkyl‐substituted secondary amines has been developed. Using a bis(amidate)bis(amido)titanium(IV) precatalyst, the hydroamination of terminal alkynes with a range of amines results in the selective formation of the anti‐Markovnikov product. The crude enamine/imine mixtures are effectively hydrogenated using palladium on carbon (Pd/C) and H2 to afford the corresponding secondary amine in excellent yields.
direct reductive N‐functionalization of aliphatic nitro compounds is presented. The nitro group is partially reduced to a nitrenoid, with a mild and readily available combination of B2pin2 and zinc organyls. Thereby, the formation of an unstable nitroso intermediate is avoided, which has so far severely limited reductive transformations of aliphatic nitro compounds. The reaction is concluded by an electrophilic