The chiral catalytic amination of an α,α-dialkyl substituted aldehyde usually proceeds with low enantioselectivity. We selected naphthyl-L-alanine as the catalyst and observed improved enantioselectivity for the amination. Using this method, racemic α-methyl-α-benzyloxypropanal was aminated to give chiral serine derivatives in 74% ee, which was further increased to >99% ee after recrystallization.
α,α-二烷基取代醛的手性催化胺化通常以低对映选择性进行。我们选择
萘基-
L-丙氨酸作为催化剂,观察到胺化反应的对映选择性得到改善。使用该方法,将外消旋的α-甲基-α-苄氧基
丙醛胺化,得到74% ee的手性
丝氨酸衍
生物,重结晶后进一步提高到>99% ee。此外,我们还成功合成了一种手性
鏻盐9,用于制备一种 α-取代的丙
氨醇化合物14作为 S1P 1激动剂,总收率高。