Asymmetric catalyst and process for preparing optically active alcohols using the same
申请人:Kanto Kagaku Kabushiki Kaisha
公开号:EP2239057A1
公开(公告)日:2010-10-13
The present invention provides an organic metal compound, a ligand, an asymmetric catalyst, and a process for preparing optically-active alcohols using the asymmetric catalyst. The organic metal compound of the present invention is expressed by the following general formula (1):
wherein in general formula (1), R1 and R2 are a mutually identical or mutually different, unsubstituted or substituted alkyl group, aryl group, cycloalkyl group, or R1 and R2 are bound to form an alicyclic ring, R3 is a hydrogen atom or an alkyl group, R4 is a branched alkyl group or an alkyl group that does or does not form a ring by itself, or an unsubstituted or substituted aryl group, or an unsubstituted or substituted heterocyclic group, Ar is an unsubstituted or substituted cyclopentadienyl group that is bound to M via a π bond, or an unsubstituted or substituted benzene, X is a hydride group or an anionic group, M is ruthenium, rhodium or iridium, L is a solvent molecule or a water molecule, 1 is 1 or 2, m is an integer from 0 to 2, n is 0 or 1, and when n is 0, X does not exist, and * represents asymmetric carbon, wherein R4 is not a camphor group, a camphor derivative group, an isopropyl group or a phenyl group whenever R1 and R2 are both a phenyl group.
本发明提供了一种有机金属化合物、一种配体、一种不对称催化剂以及一种使用该不对称催化剂制备光学活性醇的工艺。本发明的有机金属化合物由以下通式(1)表示:
其中通式(1)中,R1 和 R2 是相互相同或相互不同的未取代或取代的烷基、芳基、环烷基,或 R1 和 R2 结合形成脂环,R3 是氢原子或烷基,R4 是支链烷基或本身形成或不形成环的烷基,或未取代或取代的芳基,或未取代或取代的杂环基、Ar 是通过 π 键与 M 结合的未取代或取代的环戊二烯基,或未取代或取代的苯, X 是氢化物基团或阴离子基团,M 是钌、铑或铱,L 是溶剂分子或水分子、1 是 1 或 2,m 是 0 至 2 的整数,n 是 0 或 1,当 n 为 0 时,X 不存在,* 代表不对称碳,其中当 R1 和 R2 都是苯基时,R4 不是樟脑基团、樟脑衍生物基团、异丙基团或苯基。