Process for preparing imidazole derivative

C - Chemistry – Metallurgy – 07 – D

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C07D 495/04 (2006.01) C07D 491/04 (2006.01) C07D 491/048 (2006.01)

Patent

CA 2193459

An imidazole derivative of the general formula (1): (see fig. I) (1) wherein R1 and R2 are each a hydrogen atom or an alkyl, aryl, acyl or aralkyl group, X and Y are each an oxygen or sulfur atom, and Z is a substituted alkyl group is prepared by reducing a thienoimidazole carboxylic acid of the general formula (2): (see fig. II) (2) in an alcoholic solvent using a palladium catalyst, adding an adsorbent and an ion exchange resin, chelate resin or polymeric flocculating agent to the reaction mixture, and removing the spent catalyst from the reaction mixture.

érivé de l'imidazole de formule générale (1) : (voir fig. I) (1) où R1 et R2 sont tous deux des atomes d'hydrogène ou un groupe alkyle, aryle, acyle ou aralkyle, X et Y sont tous deux un atome d'oxygène ou de soufre, et Z est un groupe alkyle substitué; ce dérivé est préparé en réduisant un acide thiénoimidazole-carboxylique de formule générale (2) : (voir fig. II) (2) dans un solvant alcoolique en utilisant un catalyseur à base de palladium, en ajoutant au mélange réactionnel un adsorbant et une résine échangeuse d'ion, une résine chélatante ou un agent floculant polymérique, et en éliminant le catalyseur épuisé du mélange réactionnel.

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