申请人:Trustees of Boston College
公开号:US20040019212A1
公开(公告)日:2004-01-29
The present invention relates to chiral metal catalysts for stereoselective olefin metathesis reactions, which are recyclable and reusable in such metathesis reactions. The chiral metal-based metathesis catalysts of the invention comprise multidentate optically active or racemic chiral ligands that enable their use in asymmetric synthetic processes, such as for example, in ring-opening and ring-closing metathesis reactions (ROM and RCM, respectively) of alkenes. The catalysts of the invention are organometallic complexes of multivalent metals comprising one or more chiral bidentate ligands that exhibit superior reactivity and stereoselectivity properties. The present invention also provides methods of making such catalysts and methods for utilizing them in catalyzing stereoselective olefin metathesis reactions to provide asymmetric products in relatively high enantiomeric or stereoisomeric excess.
本发明涉及用于立体选择性烯烃复分解反应的手性金属催化剂,这些催化剂在这种复分解反应中是可回收和可重复使用的。该发明的手性金属基复分解催化剂包括多齿手性光学活性或消旋手性配体,使其能够在不对称合成过程中使用,例如在烯烃的环开启和环闭合复分解反应(分别为ROM和RCM)中。该发明的催化剂是多价金属的有机金属配合物,包括一个或多个手性双齿配体,具有优越的反应活性和立体选择性性质。本发明还提供制备这种催化剂的方法以及利用它们在催化立体选择性烯烃复分解反应中提供相对高对映体或立体异构体过量的不对称产物的方法。