Efficient oxidation of phenyl groups to carboxylic acids with ruthenium tetraoxide. A simple synthesis of (R)-.gamma.-caprolactone, the pheromone of Trogoderma granarium
作者:M. Teresa Nunez、Victor S. Martin
DOI:10.1021/jo00293a044
日期:1990.3
A METHOD OF CHIRAL RESOLUTION OF THE KEY INTERMEDIATE OF THE SYNTHESIS OF APREMILAST AND ITS USE FOR THE PREPARATION OF PURE APREMILAST
申请人:Zentiva K.S.
公开号:EP3280701B1
公开(公告)日:2019-10-16
Regioselective Oxidative Cleavage of Benzylidene Acetals: Synthesis of α- and β-Benzoyloxy Carboxylic Acids
fun: The synthetic potential of the highly regio‐ and stereoselective title reaction, which relies on two oxidativecleavage steps promoted by RuCl3 in combination with NaIO4 (see example; Bz=benzoyl), was demonstrated with the synthesis of biologically active cis‐(2R,3S)‐3‐hydroxypipecolic acid from D‐glucose.
Resolution of Carboxylic Acids Using Copper(I)-Promoted Removal of Propargylic Esters under Neutral Conditions
作者:Partha Ghosh、Jeffrey Aubé
DOI:10.1021/jo200433w
日期:2011.5.20
A method for the opticalresolution of carboxylic acids is described. Condensation of racemic carboxylic acids with chiral terminal propargyl alcohols gave separable diastereomeric esters. Chromatographic separation followed by heating the individual diastereomers in methanol with catalytic copper(I) halide regenerated the carboxylic acids in good yields and in enantiomeric ratios of ≥94%. This method