METHOD FOR PRODUCING OPTICALLY ACTIVE CARBOXYLIC ACID ESTER
申请人:TOKYO UNIVERSITY OF SCIENCE FOUNDATION
公开号:US20170008820A1
公开(公告)日:2017-01-12
Provided is a method for producing an optically active carboxylic acid ester at a high yield and with high enantioselectivity using dynamic kinetic resolution, said optically active carboxylic acid ester having an α-nitrogen substituent. This method for producing an optically active carboxylic acid ester includes a step in which racemic carboxylic acid represented by formula (a) and a specific alcohol or phenol derivative are reacted in a polar solvent having a dipole moment of at least 3.5 in the presence of an acid anhydride and an asymmetric catalyst, one enantiomer of the racemic carboxylic acid is selectively esterified, and the other enantiomer is racemized. In formula (a), Ra1 represents a nitrogen-containing heteroaromatic ring group bonded to an assymetric carbon via a nitrogen atom constituting a ring, and Ra2 is an organic group.
Novel substituted lactam derivatives, which are useful as angiotensinase or enkephalinase inhibitors, are described of the formula
wherein
m is 0 or 1;
n is 1, 2, 3, or 4;
R1 is C1-C3 alkyl or benzyl;
R2 is hydrogen or C1-C3 alkyl;
R3 is hydrogen or C1-C3 alkyl;
or a pharmaceutically acceptable salt thereof.
KetoABNO/NO<sub><i>x</i></sub> Cocatalytic Aerobic Oxidation of Aldehydes to Carboxylic Acids and Access to α-Chiral Carboxylic Acids via Sequential Asymmetric Hydroformylation/Oxidation
作者:Kelsey C. Miles、M. Leigh Abrams、Clark R. Landis、Shannon S. Stahl
DOI:10.1021/acs.orglett.6b01598
日期:2016.8.5
aerobic oxidation of aldehydes to carboxylicacids has been developed using organic nitroxyl and NOx cocatalysts. KetoABNO (9-azabicyclo[3.3.1]nonan-3-one N-oxyl) and NaNO2 were identified as the optimal nitroxyl and NOx sources, respectively. The mildness of the reaction conditions enables sequential asymmetric hydroformylation of alkenes/aerobic aldehyde oxidation to access α-chiral carboxylic acids