Reduction methodologies for converting ketal acids, salts, and esters to ketal alcohols
申请人:Topping Robert J.
公开号:US20080161563A1
公开(公告)日:2008-07-03
The present invention relates to methods of reducing ketal acids, salts and esters to form corresponding ketal alcohols. More particularly, the reducing methods convert the ketal acids, salts, or esters to ketal alcohols by using a reducing agent that comprises a hydride that comprises one or more alkoxy moieties. The ketal alcohol is prepared in a hydrophobic reagent. This is purified by washing the hydrophobic reagent with one or more water washes. Because the ketal alcohol has some water solubility, the water washes are back-extracted with a hydrophobic solvent to recover additional ketal alcohol from such one or more water washes. The alcohol products are useful in many applications such as intermediates in the synthesis of pharmacologically important molecules.
Epimerization methodologies for recovering stereoisomers in high yield and purity
申请人:Nicholas Gillian M.
公开号:US20080161583A1
公开(公告)日:2008-07-03
The present invention relates to methods of subjecting a mixture of stereoisomers to epimerization and optionally recrystallization procedures to obtain a desired stereoisomer in high yield and purity. Relying upon solubility differences, the epimerization desirably is carried out in a solvent mixture that extends the epimerization equilibrium in favor of the desired stereoisomer. Recrystallization from a solvent mixture upgrades the purity even more. Purified stereoisomers are useful in many applications such as intermediates in the synthesis of pharmacologically important molecules.
Process for the preparation of an isopropanol solvate of a glucokinase activator
申请人:Daniewski Andrzej Robert
公开号:US20070244129A1
公开(公告)日:2007-10-18
Provided is a process for the preparation of 2(R)-(3-Chloro-4-methanesulfonyl-phenyl)-3-((R)-3-oxo-cyclopentyl)-N-pyrazin-2-yl-propionamide and its isopropanol solvate as a glucokinase activator which increases insulin secretion in the treatment of, for example, type II diabetes.
Provided is a crystalline IPA solvate of 2(R)-(3-Chloro-4-methanesulfonyl-phenyl)-3-((R)-3-oxo-cyclopentyl)-N-pyrazin-2-yl-propionamide as a glucokinase activator which increases insulin secretion in the treatment of, for example, type II diabetes.
[EN] PROCESS FOR THE PREPARATION OF A GLUCOKINASE ACTIVATOR<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN ACTIVATEUR DE GLUCOKINASE
申请人:HOFFMANN LA ROCHE
公开号:WO2007115968A2
公开(公告)日:2007-10-18
[EN] Provided is a process for the preparation of 2(R)-(3-chloro-4-methanesulfonyl- phenyl)-3-((R)-3-oxo-cyclopentyl)-N-pyrazin-2-yl-propionamide and its isopropanol solvate as a glucokinase activator which increases insulin secretion in the treatment of, for example, type II diabetes. [FR] La présente invention concerne un procédé de préparation de 2(R)-(3-chloro-4-méthanesulfonylphényl)-3-((R)-3-oxo-cyclopentyl)-N-pyrazin-2-ylpropionamide et son solvate d'isopropanol, utilisés en tant qu'activateur de la glucokinase. Le procédé augmente la sécrétion d'insuline dans le traitement notamment du diabète de type II.