Optically pure (1S, 1'S)-1-aryl-N-(1'-alkyl-2'-hydroxyethyl)-2-phenylethylamines (13-21) were synthesized from L-alanine, L-leucine, and L-isoleucine via (S)-2-aminoalkanols (1-3) and (E)-(S)-N-(1-alkyl-2-hydroxyethyl) arylmethylideneamines (4-12). On the other hand, the amines with (1R, 1'R) configuration (33-38) were synthesized from D-amino acids, i.e., D-alanine and D-leucine. The absolute configurations of these amines were confirmed by the aromatic quadrant-sector rule. The asymmetric reactions of chiral azomethines (7-12 and 30-32) with benzylmagnesium chloride were found to be extremely highly stereoselective. However, the reactions of the azomethines (4-6 and 27-29) derived from L- and D-alanine with the Grignard reagent afforded poor stereoselectivity.
光学纯的(1S, 1'S)-1-芳基-N-(1'-烷基-2'-羟基乙基)-
2-苯乙胺(13-21)是通过(S)-2-
氨基烷醇(1-3)和(E)-(S)-N-(1-烷基-2-羟基乙基)芳基
亚胺(4-12)从
L-丙氨酸、
L-亮氨酸和
L-异亮氨酸合成的。另一方面,具有(1R, 1'R)构型的胺(33-38)是从D-
氨基酸,即
D-丙氨酸和
D-亮氨酸合成的。这些胺的绝对构型通过芳香象限扇区规则得到了确认。发现与
苄基镁氯化物的手性
亚胺(7-12和30-32)不对称反应具有极高的立体选择性。然而,来自L-和
D-丙氨酸的
亚胺(4-6和27-29)与格里尼亚试剂的反应则显示出较差的立体选择性。