Catalytic Asymmetric Intramolecular Hydroacylation with Rhodium/Phosphoramidite-Alkene Ligand Complexes
作者:Thomas J. Hoffman、Erick M. Carreira
DOI:10.1002/anie.201104595
日期:2011.11.4
Give me a P: An asymmetricintramolecular Rh‐catalyzed hydroacylation reaction of pent‐4‐enals for the preparation of functionalized cyclopentanones in good yield and high enantioselectivity is described (see scheme, DCE=dichloroethane). This process uses rhodiumcomplexes featuring novel modular phosphoramidite–alkene ligands and achiral phosphine coligands.
New Chiral Oxazoline-Phosphite Ligands for the Enantioselective Copper-Catalyzed 1,4-Addition of Organozinc Reagents to Enones
作者:Iris H Escher、Andreas Pfaltz
DOI:10.1016/s0040-4020(00)00143-5
日期:2000.4
A series of new P,N-ligands with a binaphthyl and an oxazoline moiety were prepared, which are efficient ligands for the enantioselectivecopper-catalyzed 1,4-addition of organozinc reagents to enones. Increasing the steric bulk in the 3,3′-position of binaphthyl from an H to a biphenylyl moiety improved the ee from 65 to 94% in the reaction of diethylzinc with cyclopentenone.
Phosphine compounds, complexes containing the phosphine compounds as ligands, process for producing optically active aldehydes using the phosphine compounds, or complexes, and 4-[(R)-1' formylethyl]azetidin-2-one derivatives
申请人:Takasago International Corporation
公开号:EP0614903A2
公开(公告)日:1994-09-14
Novel phosphine compounds are represented by formulae (I) and (II):
wherein the R substituents have the significations defined in the specification and are useful in the form of their transition metal complexes, or of compounds with transition metals, in producing an optically active aldehyde by hydroformylation of an olefin with high positional and steric selectivities. A 4-[(R)-1'-formylethyl]azetidin-2-one derivative obtainable by the process is particularly useful as an intermediate for the preparation of carbapenem antibiotics.
新颖的膦化合物由式 (I) 和 (II) 表示:
其中 R 取代基具有说明书中定义的含义,以其过渡金属络合物或与过渡金属的化合物的形式,通过烯烃的氢甲酰化生产光学活性醛,具有高位置选择性和立体选择性。通过该工艺获得的 4-[(R)-1'-甲酰基乙基]氮杂环丁烷-2-酮衍生物尤其可用作制备碳青霉烯类抗生素的中间体。
Phosphine compounds, complexes containing the phosphine compounds as ligands, and process for producing optically active aldehydes using the phosphine compounds or complexes
申请人:Takasago International Corporation
公开号:EP0684249A1
公开(公告)日:1995-11-29
Novel phosphine compounds are represented by formulae (I) and (II):
wherein the R substituents have the significations defined in the specification and are useful in the form of their transition metal complexes, or of compounds with transition metals, in producing an optically active aldehyde by hydroformylation of an olefin with high positional and steric selectivities.
新颖的膦化合物由式 (I) 和 (II) 表示:
其中 R 取代基具有说明书中定义的含义,以其过渡金属络合物或与过渡金属的化合物的形式,通过烯烃的氢甲酰化反应生产光学活性醛时,具有高位置选择性和立体选择性。
Process for producing optically active aldehydes using transition metal-phosphine complexes, and process for producing intermediates for carbapenem antibiotics using the same complexes