Highly efficient Ni-catalyzed asymmetric hydrogenation of cyclic N-sulfonyl ketimino esters was, for the first time, successfully developed, providing various chiral α-monosubstituted α-amino acid derivatives with excellent results (97-99% yields, 90 to >99% ee). Cyclic N-sulfonyl ketimines were also hydrogenated well to afford chiral amine derivatives with 98-99% yields and 97 to >99% ee. The gram-scale asymmetric hydrogenation was performed well with 85% yield and 99% ee using only 0.2 mol% catalyst.

中文翻译：

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Ni催化的不对称氢化反应合成手性α-取代α-氨基酸和胺衍生物。

首次成功开发了高效的Ni催化的环状N-磺酰基酮亚胺基酯的不对称加氢反应，提供了各种具有优异效果的手性α-单取代α-氨基酸衍生物（97-99％的收率，90至> 99％ ee）。环状N-磺酰基酮亚胺也被充分氢化，以98-99％的收率和97至＞ 99％的ee得到手性胺衍生物。仅使用0.2mol％的催化剂，克级不对称氢化进行得很好，产率为85％，ee为99％。