Process for the production of dronabinol

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 311/80 (2006.01) A61K 9/00 (2006.01)

Patent

CA 2472561

A method for the production of dronabinol is disclosed, whereby: a) cannabidiol is isolated from fibrous hemp as cannabidiol acid, b) the cannabidiol, optionally obtained by decarboxylation, is cyclised in the presence of Lewis acids in a non-polar solvent to give dronabinol, c) the above is isolated by a chromatographic method and d) the residue obtained from the eluant after distilling off the solvent is purified by vacuum distillation. The dronabinol can be used for dispensing purposes in a syringe filled therewith and as inhalation solution for thermal nebulisation with hot air.

Procédé de préparation de dronabinol qui consiste (a) à isoler du cannabidiol sous forme d'acide de cannabidiol à partir de chanvre indien, (b) éventuellement à cycliser le cannabidiol obtenu par décarboxylation en présence d'acides de Lewis dans un solvant non polaire pour obtenir du dronabinol, (c) à isoler ce dernier par un procédé chromatographique et (d) à purifier par distillation sous vide le résidu obtenu à partir de l'éluat, après élimination du solvant par distillation. Le dronabinol peut par ex. être utilisé, pour des préparations pharmaceutiques, dans une seringue remplie de ladite matière, et en tant que solution d'inhalation, par nébulisation thermique à l'aide d'air chaud.

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