A simple nickel catalyst converts terminal alkynes and formic acid to α-chiral carboxylic acids in high enantioselectivity. The reaction proceeds via the hydrocarboxylation of alkynes and enantioselective transfer hydrogenation of acrylic acids.
Kinetic Resolution of Racemic α-Arylalkanoic Acids with Achiral Alcohols via the Asymmetric Esterification Using Carboxylic Anhydrides and Acyl-Transfer Catalysts
enantioselective coupling reaction betweenracemic carboxylic acids and a novel nucleophile, bis(alpha-naphthyl)methanol, to give the corresponding esters with high ee's. This protocol was successfully applied to the production of nonracemic nonsteroidal anti-inflammatory drugs from racemiccompounds utilizing the transacylation process to generate the mixed anhydrides from the acid components with the suitable carboxylic
通过使用非手性醇、芳香族或脂肪族羧酸酐和手性酰基转移催化剂对外消旋 α-取代羧酸进行动力学拆分,可以生产多种光学活性羧酸酯。4-甲氧基苯甲酸酐 (PMBA) 或新戊酸酐与改性苯并四甲醚型催化剂 ((S)-β-Np-BTM) 的组合对于促进外消旋羧酸与新型亲核试剂之间的对映选择性偶联反应最有效, 双(α-萘基)甲醇,得到相应的具有高 ee 的酯。
Simultaneous control of regioselectivity and enantioselectivity in the hydroxycarbonylation and methoxycarbonylation of vinyl arenes
作者:Tina M. Konrad、Jamie T. Durrani、Christopher J. Cobley、Matthew L. Clarke
DOI:10.1039/c3cc41291a
日期:——
Using a family of novel mononuclear and dinuclear palladium complexes of phanephos ligands, the simultaneous control of regioselectivity and enantioselectivity in the hydroxycarbonylation and alkoxycarbonylation of styrene derivatives has been realised for the first time.
Hydrogen Bond Enhanced Enantioselectivity in the Nickel-Catalyzed Transfer Hydrogenation of α-Substituted Acrylic Acid with Formic Acid
作者:Yaxin Sun、Chao Wang、Peng Yang、Jie-Yu Yue、Chang Xu、Jianrong Steve Zhou、Bo Tang
DOI:10.1021/acscatal.3c04187
日期:2023.11.3
asymmetric transferhydrogenation of α-substituted acrylic acids under mild conditions and avoided the use of high-pressure hydrogen gas was developed. The products included chiral β-amino acids and α-methyl carboxylic acids such as three nonsteroidal anti-inflammatory profens. Deuterium-labeling experiments and DFT studies pointed to an unconventional protonation of a metalacyclopropane complex formed by
METHOD FOR MANUFACTURING OPTICALLY ACTIVE CARBOXYLIC ACID ESTER
申请人:Tokyo University Of Science
Educational Foundation Administrative Organization
公开号:EP2719679A1
公开(公告)日:2014-04-16
A method that manufacturers an optically active carboxylic acid ester at high yield and high enantioselectivity is provided. An optically active carboxylic acid ester is manufactured at high yield and high enantioselectivity by reacting a racemic carboxylic acid and a specific alcohol or phenol derivatives in a polar solvent having a dipole moment of 3.0 or higher in the presence of an acid anhydride and an asymmetric catalyst, esterifying one enantiomer of the racemic carboxylic acid at high selectivity, and increasing the amount of esterified carboxylic acid by racemizing the optically active carboxylic acid which is the other enantiomer not used in esterification.