[EN] CHIRAL METAL COMPLEX COMPOUNDS<br/>[FR] COMPOSÉS COMPLEXES MÉTALLIQUES CHIRAUX
申请人:HOFFMANN LA ROCHE
公开号:WO2018189060A1
公开(公告)日:2018-10-18
The invention comprises novel chiral metal complex compounds of the formula (I) wherein M, PR2, R3 and R4 are outlined in the description, its stereoisomers, in the form as a neutral complex or a complex cation with a suitable counter ion. The chiral metal complex compounds can be used in asymmetric reactions, particularly in asymmetric reductions of ketones, imines or oximes.
A new chiral manganese PNP pincercomplex is described. The asymmetric hydrogenation of several prochiral ketones with molecular hydrogen in the presence of this complex proceeds under mild conditions (30–40 °C, 4 h, 30 bar H2). Besides high catalytic activity for aromatic substrates, aliphatic ketones are hydrogenated with remarkable selectivity (e.r. up to 92:8). DFT calculations support an outer
描述了一种新的手性锰PNP钳复合物。在温和的条件下(30–40°C,4 h,30 bar H 2),在这种配合物的存在下,几种前手性酮与分子氢的不对称氢化反应。除了对芳族底物具有高催化活性外,脂族酮还具有显着的选择性(高达92:8)氢化。DFT计算支持外球氢化机理以及实验确定的立体化学。
Oxo-Tethered Ruthenium(II) Complex as a Bifunctional Catalyst for Asymmetric Transfer Hydrogenation and H<sub>2</sub> Hydrogenation
Newly developed oxo-tethered Ru amido complexes (R,R)-1 and their HCl adducts (R,R)-2 exhibited excellent catalytic performance for both asymmetric transfer hydrogenation and the hydrogenation of ketonic substrates under neutral conditions without any cocatalysts to give chiral secondary alcohols with high levels of enantioselectivity.
The synthesis of different metal pincer complexes coordinating to the chiral PNP ligand bis(2‐((2R,5R)‐2,5‐dimethyl‐phospholanoethyl))amine is described in detail. The characterized complexes with Mn, Fe, Re and Ru as metal centers showed good activities regarding the reduction of several prochiral ketones. Comparing these catalysts, the non‐noble metal complexes produced best selectivities not only for
ASYMMETRIC REDUCTION OF PROCHIRAL CYCLIC KETONES WITH LITHIUM ALUMINUM HYDRIDE PARTIALLY DECOMPOSED BY (1R,2S)-(−)-<i>N</i>-METHYLEPHEDRINE AND 2-ALKYLAMINOPYRIDINE
The title chiral hydride was found to reduce prochiral cyclicketones, affording the corresponding optically active cyclic alcohols in high optical(max. 9 8%ee) yields.