Direct catalytic asymmetric Mannich-type reactions of isomerizable aliphatic imines: chemoselective enolate formation from a hydroxyketone by a Zn-catalyst
作者:Akitake Yamaguchi、Shigeki Matsunaga、Masakatsu Shibasaki
DOI:10.1016/j.tetlet.2006.04.016
日期:2006.6
A direct catalytic asymmetric Mannich-type reaction of isomerizable aliphatic imines is described. A Et2Zn/(S,S)-linked-BINOL complex was suitable for chemoselective enolate formation from a hydroxyketone in the presence of isomerizable aliphatic N-diphenylphosphinoyl imines. The reaction proceeds smoothly and β-alkyl-β-amino-α-hydroxyketones were obtained in good yield and high enantioselectivity
描述了可异构化的脂族亚胺的直接催化不对称曼尼希型反应。在可异构化的脂族N-二苯基膦酰基亚胺的存在下,Et 2 Zn /(S,S)-连接的BINOL络合物适合于由羟基酮形成化学选择性烯醇盐。反应进行得很顺利,尽管具有中等至低非对映选择性,但仍能以良好的收率和高对映选择性(高达99%ee)获得β-烷基-β-氨基-α-羟基酮。