Sequential Reductive Amination-Hydrogenolysis: A One-Pot Synthesis of Challenging Chiral Primary Amines
作者:Thomas C. Nugent、Daniela E. Negru、Mohamed El-Shazly、Dan Hu、Abdul Sadiq、Ahtaram Bibi、M. Naveed Umar
DOI:10.1002/adsc.201100250
日期:2011.8
Difficult-to-access chiralprimaryamines were formed in good to high yield and ee using a rare example of a one-potsynthesis from prochiral ketones (sequentialreductive amination-hydrogenloysis). As a highlight we also demonstrate a one-potreductive amination-hydrogenolysis-reductive amination (five reactions) of ortho-methoxyacetophenone resulting in the chiral diamine 1-(2-methoxyphenyl)ethy
A facile method for the asymmetric synthesis of enantiomerically pure 1-(2-fluorophenyl)-ethylamine [1]
作者:G. Bringmann、J.-P. Geisler
DOI:10.1016/s0022-1139(00)80363-2
日期:1990.7
A simple, two-step-procedure for the synthesis of optically active (S)-1-(2-fluorophenyl)- ethylamine (1) is described. Starting from commercially available 2-fluoro-acetophenone (2), imination with (S)-1-phenyl-ethylamine (3), followed by stereoselective hydrogenation over Raney-nickel gives the secondary amine 5a. Subsequent regioselective hydrogenolytic cleavage of homogenous 5a yields enantiomerically
Routes to enantioenriched amines are outlined that employ reductive amination and carbanion addition methods. The strategies require either one or two reaction steps from prochiral carbonyl compounds for the synthesis of the corresponding chiral primary amines.