Penam crystals and process for producing the same

Details Penam crystals and process for producing the same Penam crystals and process for producing the same

C - Chemistry, Metallurgy

07

D

C07D 499/00 (2006.01)

Patent

CA 2540601

Novel 2.alpha.-methyl-2.beta.-[(1,2,3-triazol-1-yl)methyl]penam~-3.alpha.- carboxylic acid benzhydryl ester (TMPB)-acetone crystals for use in producing 2.alpha.-methyl-2.beta.-[(1,2,3-triazol-1-yl)~methyl]penam-3.alpha.-carboxylic acid 1,1-dioxide benzhydryl ester (TAZB); a process for producing TMPB-acetone crystals which comprises (A) the step of concentrating an organic solvent solution containing TMPB, (B) the step of dissolving the resultant concentrate in acetone, and (C) the step of crystallizing TMPB-acetone crystals from the acetone solution obtained; and a process for producing TAZB which comprises the step of reacting TMPB-acetone crystals with an oxidizing agent.

La présente invention se rapporte à de nouveaux cristaux d'un ester benzhydrylique de l'acide 2.alpha.-méthyl-2.beta.-[(1,2,3-triazol-1-yl)méthyl]penam-3.alpha.-carboxylique (TMBP)-acétone qui sont utilisés pour produire un ester 1,1-dioxyde benzhydrylique de l'acide 2.alpha.-méthyl-2.beta.-[(1,2,3-triazol-1-yl)méthyl]penam-3.alpha.-carboxylique (TAZB) ; à un procédé de production de cristaux TMBP-acétone comprenant (a) une étape de concentration d'une solution de solvant organique contenant du TMBP, (B) une étape de dissolution du concentrat obtenu dans l'acétone, et (C) une étape de cristallisation des cristaux TMBP-acétone à partir de la solution d'acétone obtenue ; et à un procédé de production de TAZB selon lequel on fait réagir les cristaux de TMBP-acétone avec un agent oxydant.

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