Process for preparation of 4-deoxyerythromycins a and b

C - Chemistry – Metallurgy – 07 – H

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C07H 17/08 (2006.01) A61K 31/70 (2006.01)

Patent

CA 2277992

A process for the preparation of 4"-deoxyerythromycins, having formula (I), wherein R is H or OH, Rp is H or acetyl, and R1 is H or loweralkyl; by treatment of the 2'-O-acetyl-4"-imidazolylthionocarbonyl- erythromycin starting material with the radical initiator 4,4'-azobis-(4-cyanovaleric acid), H3PO2 and an organic base in a water- miscible solvent other than an alcohol, and optionally eliminating the 2'-O-acetyl group. In a preferred embodiment, the water-miscible solvent is an alcohol and the deoxygenation and deacetylation is carried out in one step.

L'invention concerne un procédé de préparation de 4''-désoxyérythromycines de la formule (I), dans laquelle R représente H ou OH, Rp représente H ou acétyle, et R<1> représente H ou alkyle inférieur, par traitement de la matière de départ 2'-O-acétyle-4''-imidazolylthionocarbonyl-érythromycine avec l'initiateur de radicaux 4,4'-azobis-(4-acide cyanovalérique), H3PO2 ainsi qu'une base organique dans un solvant miscible dans l'eau autre qu'un alcool, et facultativement élimination du groupe 2'-O-acétyle. Dans un mode de réalisation préféré, le solvant miscible dans l'eau est un alcool et la désoxygénation ainsi que la désacétylation sont effectuées en une étape.

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