Influence des substituants sur la vitesse de racémisation des cétones à carbone dissymétrique en alpha
作者:A. K. Mills、A. E. Wilder Smith
DOI:10.1002/hlca.19600430705
日期:——
The rates of racemisation, under constant conditions of pH and temperature, of two series of ketones with an asymmetric C-atom in α have been determined. As would be expected, substituents in the α position to the keto group influence the rate of racemisation, and it has been found possible to assess the relative electron donating or electron attracting effect of aliphatic, aliphatic-aromatic or aromatic
Asymmetric Hydrogenation of Schiff Base Prepared from α-Keto Ester with Aliphatic Amino Acid Ester
作者:Kaoru Harada、Shozo Shiono
DOI:10.1246/bcsj.57.1367
日期:1984.5
prepared from α-ketoesters with amino acidesters was carried out under various conditions. A significant substituent effect of the alkyl group of the ester moiety of amino acid on the stereoselectivity was observed in the hydrogenation of the Schiff bases prepared from methyl pyruvate with (S)-alanine ester. Higher asymmetric yields were obtained as the ester residue of amino acidester became bulkier