An Enantioselective Route to α-Methyl Carboxylic Acids via Metal and Enzyme Catalysis
摘要:
Dynamic kinetic resolution of allylic alcohols to allylic acetates followed by copper-catalyzed allylic substitution gave alkenes in high yields and high optical purity. Subsequent oxidative C-C double bond cleavage afforded pharmaceutically important alpha-methyl substituted carboxylic acids in high ee.
An Enantioselective Route to α-Methyl Carboxylic Acids via Metal and Enzyme Catalysis
摘要:
Dynamic kinetic resolution of allylic alcohols to allylic acetates followed by copper-catalyzed allylic substitution gave alkenes in high yields and high optical purity. Subsequent oxidative C-C double bond cleavage afforded pharmaceutically important alpha-methyl substituted carboxylic acids in high ee.
Dynamic Processes in the Copper-Catalyzed Substitution of Chiral Allylic Acetates Leading to Loss of Chiral Information
作者:Jakob Norinder、Jan-E. Bäckvall
DOI:10.1002/chem.200601684
日期:2007.5.7
formation. Equilibration of the reaction intermediates is of importance for a possible development of a dynamickineticasymmetrictransformation (DYKAT) process, in which a chiral catalyst is used to produce an optically active product from a racemicsubstrate, by means of a dynamic equilibrium of the diastereomeric reaction intermediates.
Chemoenzymatic Dynamic Kinetic Resolution of Allylic Alcohols: A Highly Enantioselective Route to Acyloin Acetates
作者:Krisztián Bogár、Pilar Hoyos Vidal、Andrés R. Alcántara León、Jan-E. Bäckvall
DOI:10.1021/ol071395v
日期:2007.8.1
Dynamic kineticresolution (DKR) of a series of sterically hindered allylic alcohols has been conducted with Candida antarctica lipase B (CALB) and ruthenium catalyst 1. The optically pure allylic acetates obtained were subjected to oxidative cleavage to give the corresponding acylated acyloins in high yields without loss of chiral information.
Dynamic kinetic resolution of allylic alcohols to allylic acetates followed by copper-catalyzed allylic substitution gave alkenes in high yields and high optical purity. Subsequent oxidative C-C double bond cleavage afforded pharmaceutically important alpha-methyl substituted carboxylic acids in high ee.