As a new type of chiral cocatalyst in the achiral base-coordinated bis(dimethylglyoximato)cobalt(II)–chiral cocatalyst system, tertiary amines with an amide group at α- or β-carbon were prepared, and asymmetric hydrogenation was examined by using them. The optical yield reached 34.5% enantiomeric excess(ee) by using N-[(2S,3S)-2-acetoxy-3-dimetnylamino-3-phenylpropionyl]-(R)-α-methylbenzylamine; this is the highest value attained so far in the asymmetric hydrogenation of methyl N-(acetylamino)acrylate with this system. The enantioselectivity in the hydrogenation of methyl N-(acetylamino)acrylate was reversed with a configurational alteration of the α-methylbenzylamine moiety of N-[N,N-dimethyl-(S)-phenylalanyl]-α-methylbenzylamine, while it was not reversed in the hydrogenation of benzil by the configurational alteration. From these facts, it is deduced that the hydrogen bond between amide groups of the chiral amino carboxamides and methyl N-(acetylamino)acrylate may act as an attractive force to enhance the enantioselectivity of the asymmetric hydrogenation.
在非手性基团配位的双(二
甲基乙二
肟)
钴(II)–手性共
催化剂体系中,作为一种新型的手性共
催化剂,制备了在α-或β-
碳上含有
酰胺基的三级胺,并使用它们进行了不对称
氢化反应的研究。通过使用N-[(2S,3S)-2-乙酰
氧基-3-二
甲基氨基-3-
苯基丙酰基]-(R)-α-
甲基苯乙胺,光学产率达到了34.5%的ee值;这是迄今为止在该体系下对
甲基N-(乙酰
氨基)
丙烯酸酯进行不对称
氢化反应中获得的最高值。当N-[
N,N-二甲基-(S)-
苯丙
氨酰]-α-
甲基苯乙胺的α-
甲基苯乙胺部分发生构型改变时,
甲基N-(乙酰
氨基)
丙烯酸酯的
氢化反应中的立体选择性发生了反转,而通过构型改变对
苯偶酰的
氢化反应中的立体选择性没有发生反转。从这些事实可以推断,手性
氨基酸酰胺与
甲基N-(乙酰
氨基)
丙烯酸酯之间的
酰胺基
氢键可能作为一种吸引力,增强不对称
氢化反应的立体选择性。