Reactions of chlorine substituted (E)-2,3-diphenylpropenoic acids over cinchonidine-modified Pd: Enantioselective hydrogenation versus hydrodechlorination
The effect of the chlorine position on the C-Cl bond hydrogenolysis and the enantioselective hydrogenation of Cl substituted (E)-2,3-diphenylpropenoic acid derivatives has been studied over cinchonidine-modified Pd/Al2O3. In contrast to the fast hydrodechlorination of the beta-phenyl-para-Cl substituted acids the Cl on the alpha-phenyl ring was barely hydrogenolized. These observations were interpreted by the different arrangements of the two phenyl rings on the surface, with the alpha- and beta-phenyl rings adsorbed tilted and parallel, respectively. The results confirmed the beneficial effect of the alpha-phenyl-ortho-substituents on the chiral discrimination, thus the 2,3-diphenylpropionic acids substituted by Cl on the alpha-phenyl ring could be prepared in good yields and optical purities. The conclusions were used for the rational design of an acid, i.e. (E)-2-(2-methoxyphenyl)-3-(3,4-difluorophenyl)propenoic acid, which afforded the best optical purity (ee up to 95% at 295 K) described until now in this heterogeneous system. (C) 2010 Elsevier B.V. All rights reserved.
NEW TRIFLUOROMETHYLPROPANAMIDE DERIVATIVES
申请人:F. Hoffmann-La Roche AG
公开号:EP3262026A1
公开(公告)日:2018-01-03
US9980929B2
申请人:——
公开号:US9980929B2
公开(公告)日:2018-05-29
[EN] NEW TRIFLUOROMETHYLPROPANAMIDE DERIVATIVES<br/>[FR] NOUVEAUX DÉRIVÉS TRIFLUOROMÉTHYLEPROPANAMIDE
申请人:HOFFMANN LA ROCHE
公开号:WO2016135070A1
公开(公告)日:2016-09-01
The invention provides novel compounds having the general formula (I) wherein R1, R2, R3, R4, R5, R6 and R7 are as described herein, compositions including the compounds and methods of using the compounds.