Method for separating carbinols

Details Method for separating carbinols Method for separating carbinols

C - Chemistry, Metallurgy

12

P

C12P 41/00 (2006.01) C07D 231/12 (2006.01) C12P 17/10 (2006.01)

Patent

CA 2211156

A method for predominantly preparing the enantiomer (R)-(+)-5-(phenyl)hydroxymethyl-1-methyl-1H-pyrazole, (R)-(+)-1, by separating the racemate (+)-5-(phenyl)hydroxymethyl-1-methyl-1H-pyrazole of formula (1), comprising the series of steps of using a lipase or material derived therefrom having enzymatic activity in a transesterification reaction, as well as hydrolysing the resulting ester, (S)-(-)-5-(phenyl)alkylcarbonyloxymethyl-1-methyl-1H-pyrazole, of formula (S)-(-)-4, wherein R¿1? is a methyl or ethyl radical.

La présente invention concerne un procédé pour préparer de façon prédominante l'énantiomère (R)-(+)-5-(phényl)hydroxyméthyl-1-méthyl-1H-pyrazole, (R)-(+)-1, par séparation du mélange racémique (+)-5-(phényl)hydroxyméthyl-1-méthyl-1H- pyrazole, de formule (1), qui se caractérise par un procédé séquentiel qui comprend l'utilisation d'une lipase ou d'une matière dérivée de celle-ci possédant une activité enzymatique en une réaction de transestérification, ainsi que l'hydrolyse de l'ester formé, (S)-(-)-5- (phényl)alkylcarbonyloxyméthyl-1-méthyl-1H-pyrazole, de formule (S)-(-)-4 dans laquelle R1 représente un radical méthyle ou éthyle.

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