New Synthetic Strategy for High-Enantiopurity N-Protected α-Amino Ketones and their Derivatives by Asymmetric Hydrogenation
作者:Tian Sun、Guohua Hou、Miaofeng Ma、Xumu Zhang
DOI:10.1002/adsc.201000680
日期:2011.2.11
Asymmetrichydrogenation of α-dehydroaminoketones catalyzed by a rhodium-chiral phosphorus ligand complex (up to 99% ee, 1000 TON), represents an efficient approach to chiralα-aminoketones. The reduction of α-aminoketones catalyzed by palladium on carbon (Pd/C) leads to amphetamine precursors with quantitative yield and no significant enantioselectivity loss.
Electrophilic Amination of Ketone Enolates Mediated by the DiTOX Asymmetric Building Block: Enantioselective Formal Synthesis of α-Aminoacids
作者:Philip C. Bulman Page、Michael J. McKenzie、Steven M. Allin、Derek R. Buckle
DOI:10.1016/s0040-4020(00)00923-6
日期:2000.12
Diastereoselective electrophilic amination of enolates derived from 2-acyl-1,3-dithiane 1-oxides is used as the key step for an enantioselective synthesis of two α-hydrazido carboxylic acids, well-known precursors of α-amino acids.
Diastereoselectivity in the addition of grignard reagents to ketones controlled by the 1,3-dithiane 1-oxide asymmetric building block
作者:Philip C. Bulman Page、Jeremy C. Prodger、Donald Westwood
DOI:10.1016/s0040-4020(01)80562-7
日期:1993.1
2-Acyl-1,3-dithiane 1-oxides undergo diastereoselectiveaddition of Grignardreagents; the degree of selectivity observed is highly dependent upon the solvent and the halide counter-ion used; very high selectivities have been observed under certain reaction conditions.