Asymmetric .ALPHA.-substituted phenethylamines. V. Synthesis of chiral 1-alkyl-2-phenylethylamines via Grignard reaction of 4-phenyl-1,3-oxazolidines.
作者:HIROSHI TAKAHASHI、YASUHIRO CHIDA、KIMIO HIGASHIYAMA、HIRAKU ONISHI
DOI:10.1248/cpb.33.4662
日期:——
Chiral N-methyl-4-phenyl-1, 3-oxazolidines (2a-e) having a methyl, ethyl, benzyl, isopropyl, and cyclohexyl group at the 2-position of the 1, 3-oxazolidine ring were synthesized. Reactions of 2a-e with Grignard reagents gave (1R, 1'R)- and (1S, 1'R)-1-alkyl-and 1-cycloalkyl-N-2'-hydroxy-1'-phenylethyl-2-phenylethylamines (3a, 3b, 3d, 3e). The absolute configurations of (1R, 1'R)-3a and-3e were determined. (R)-1-Methyl-and (R)-1-cyclohexyl-2-phenylethylamines (4a, 4e) were obtained in high yield by hydrogenolysis of (1R, 1'R)-3a and -3e.
合成了在1, 3-恶唑烷环的2-位上具有甲基、乙基、苄基、异丙基和环己基的手性N-甲基-4-苯基-1, 3-恶唑烷(2a-e)。 2a-e与格氏试剂反应得到(1R, 1'R)-和(1S, 1'R)-1-烷基-和1-环烷基-N-2'-羟基-1'-苯乙基-2-苯乙胺(3a、3b、3d、3e)。确定了(1R,1'R)-3a和-3e的绝对构型。通过(1R,1'R)-3a和-3e的氢解以高产率获得(R)-1-甲基-和(R)-1-环己基-2-苯基乙胺(4a,4e)。