分别由S -α-苯乙胺和S-丙氨酸乙酯制备了两种分子式为RN(P(C 6 H 5)2的手性二膦,即S -peap和S -alap,它们的合成方法和制备方法的非手性二膦配位基的N,N′-双(二苯基膦基)-N,N′-二苄基乙二胺被描述。这些式为Pt(螯合物)CH 3 Cl和[Pt(螯合物)CH 3( X)] ClO 4(X丙酮; p -YC 5 H4 N,当Y = CH 3,C 2 H 5,CHO,CO 2 CH 3,H和N(CH 3)2时;以及一系列单齿V组供体配体P(C 2 H 5)3,P(C 3 H 7)3,P(C 8 H 17)3,PCH 3(C 6 H 5)2,P( CH 3)2 C 6 H 5,P(C 6 H 5)3,P(C 6 H 11)(C 6 H 5)2,P(C 6 H 11)2 C 6 H 5,P(C 6 H 11)3,P(C 6 H 5)2 N(已经制备了C 2 H 5)2,As(C
Diastereomeric chiral diphosphine chioro(η<sup>5</sup>-cyclopentadienyl)ruthenium(<scp>II</scp>) complexes and the crystal structure of [(S)RuCl(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>){(R)Ph<sub>2</sub>PCH(Me)CH<sub>2</sub>PPh<sub>2</sub>}]
Diastereomeric [RuCl(η5-C5H5)Ph2PCH(R)CH2PPh2}] chelate complexes (where R = CH3, cyclo-C6H11, or C6H5) form in nearly equimolar amounts in the displacementreaction of triphenylphosphine from [RuCl(η5-C5H5)(PPh3)2]. The diastereomers were separated by fractional crystallization. Diastereomeric composition at the equilibrium showed a low asymmetric induction (28–41%) by the optically active diphosphine ligand
非对映体将[RuCl(η 5 -C 5 H ^ 5)博士2 PCH(R)CH 2 PPH 2 }]螯合络合物(其中R = CH 3,环-C 6 H ^ 11,或C 6 H ^ 5)形式在近等摩尔量在从三苯基膦的置换反应将[RuCl(η 5 -C 5 H ^ 5)(PPH 3)2]。通过分级结晶分离非对映异构体。非对映体组成在手性钌原子上的旋光性二膦配体表现出低的不对称诱导(28-41%)。钌原子上的绝对构型对络合物的手性几乎没有影响,络合物的手性至少在可见区域似乎由螯合配体的手性构象支配。标题非对映体的晶体结构,[(小号)的RuCl(η 5 -C 5 H ^ 5)([R)PH 2 PCH(Me)的CH 2 PPH 2 }],进行了研究。是单斜的,空间群P 21, a = 9.688(3), b = 15.037(4), c = 10.556(2)Å,β= 113.54(2)°, Z =
Method for the Production of Optically Active Carbonyl
申请人:Jakel Christoph
公开号:US20080269528A1
公开(公告)日:2008-10-30
The present invention relates to a process for preparing optically active carbonyl compounds by asymmetrically hydrogenating α,β-unsaturated carbonyl compounds in the presence of optically active transition metal catalysts which are soluble in the reaction mixture and have at least one carbon monoxide ligand. The present invention especially relates to a process for preparing optically active aldehydes or ketones, in particular citronellal, by asymmetrically hydrogenating the corresponding optically active α,β-unsaturated aldehydes or ketones.
METHOD FOR SYNTHESIZING OPTICALLY ACTIVE CARBONYL COMPOUNDS
申请人:Schmidt-Leithoff Joachim
公开号:US20100152494A1
公开(公告)日:2010-06-17
The present invention relates to a process for preparing optically active carbonyl compounds by asymmetrically hydrogenating α,β-unsaturated carbonyl compounds in the presence of optically active transition metal catalysts which are soluble in the reaction mixture and have at least one carbon monoxide ligand, the optically active catalyst which has at least one carbon monoxide ligand and is to be used in each case being prepared by pretreating a catalyst precursor with a gas mixture comprising carbon monoxide and hydrogen and the asymmetric hydrogenation being performed in the presence of carbon monoxide supplied additionally to the reaction mixture.
Disclosed are compounds of formula X,
1
which are useful in treating Alzheimer's disease and other similar diseases. Pharmaceutical compositions comprising compounds of formula X and methods of preparing the compounds of formula X are also disclosed.
Processes and intermediates for preparing benzyl epoxides
申请人:——
公开号:US20030004360A1
公开(公告)日:2003-01-02
Disclosed are intermediates and processes for preparing epoxides of the formula:
1
where R and PROT are defined herein. These epoxides are useful as intermediates in the production of biologically active compounds, i.e., in the production of pharmaceutical agents.