Heterogeneous Raney Nickel and Cobalt Catalysts for Racemization and Dynamic Kinetic Resolution of Amines
作者:Andrei N. Parvulescu、Pierre A. Jacobs、Dirk E. De Vos
DOI:10.1002/adsc.200700336
日期:2008.1.4
Raney metals were studied as heterogeneous catalysts for racemization and dynamic kinetic resolution (DKR) of chiral amines, as an alternative to metals like palladium or ruthenium. Both Raney nickel and cobalt were able to selectively racemize various chiral amines with high selectivity. In the racemization of benzylic primary amines, the minor formation of side products, e.g., secondary amines, can
研究阮内金属作为手性胺的外消旋和动态动力学拆分(DKR)的非均相催化剂,可以替代钯或钌等金属。雷尼镍和钴都能够以高选择性选择性消旋各种手性胺。在苄基伯胺的外消旋化中,副产物(例如仲胺)的少量形成可以通过改变氢压得到抑制。在阮内催化剂上脂肪胺的外消旋中,选择性很高,对映体胺是唯一的产物。外消旋脂肪胺的DKR可以在一个锅中用固定的南极假丝酵母脂肪酶B和阮内镍进行。对于2-己胺,获得95%的乙酰化酰胺产率,而ee为97%。在DKR期间,注意力集中在酶和金属催化剂的相容性上。对于苄基伯胺,提出了一种两锅法,其中液体在包含固体外消旋催化剂和生物催化剂的两个容器之间交替穿梭。在4个这样的循环后,以94%的收率和大于90%的ee获得(R)-1-苯基乙胺的酰胺。