Chemoselective reductive alkylation of ammonia with carbonyl compounds: synthesis of primary and symmetrical secondary amines
作者:Bruhaspathy Miriyala、Sukanta Bhattacharyya、John S Williamson
DOI:10.1016/j.tet.2003.12.024
日期:2004.2
efficient, general procedure for highly chemoselective reductive mono-alkylation of ammonia with ketones is reported. Treatment of ketones with ammonia in ethanol and titanium(IV) isopropoxide, followed by in situ sodium borohydride reduction, and a straightforward workup afforded primary amines in good to excellent yields. Reductive alkylation of ammonia with aldehydes, on the other hand, afforded the corresponding
Unexpected selectivity in ruthenium-catalyzed hydrosilylation of primary amides: synthesis of secondary amines
作者:Bin Li、Jean-Baptiste Sortais、Christophe Darcel
DOI:10.1039/c3cc39149c
日期:——
Selectiveruthenium-catalyzed reductive coupling of primary amides under hydrosilylation conditions is achieved using an one pot procedure. Using 3 equiv. of phenylsilane and [RuCl2(mesitylene)]2 (1-2 mol%) as the catalyst at 100 degrees C under neat conditions, secondary symmetric amines were obtained in good yields and with high chemoselectivities.
efficient copper-catalyzed selectivetransferhydrogenation of nitriles to primary amine-boranes and secondary amines with an oxazaborolidine–BH3 complex is reported. The selectivity control was achieved under mild conditions by switching the solvent and the copper catalysts. More than 30 primary amine-boranes and 40 secondary amines were synthesized via this strategy in high selectivity and yields of up to
Phosphine-Free Manganese Catalyst Enables Selective Transfer Hydrogenation of Nitriles to Primary and Secondary Amines Using Ammonia–Borane
作者:Koushik Sarkar、Kuhali Das、Abhishek Kundu、Debashis Adhikari、Biplab Maji
DOI:10.1021/acscatal.0c05406
日期:2021.3.5
primary and secondary amines by nitrilehydrogenation, employing a borrowing hydrogenation strategy. A class of phosphine-free manganese(I) complexes bearing sulfur side arms catalyzed the reaction under mild reaction conditions, where ammonia–borane is used as the source of hydrogen. The synthetic protocol is chemodivergent, as the final product is either primary or secondary amine, which can be controlled
Rhenium(I) nitrosylcomplexesbearinglargebiteanglediphosphines efficiently catalyze the hydrogenation of nitriles to the corresponding symmetrical secondary amines.