Process for the synthesis of cleistanthin

Details Process for the synthesis of cleistanthin Process for the synthesis of cleistanthin

C - Chemistry, Metallurgy

07

D

C07D 407/14 (2006.01)

Patent

CA 2751578

The present invention relates to a process for preparing compound of formula (I) that is Cleistanthin A. The process comprises the steps of reacting compound of formula (II) with compound of formula (III) in the presence of a first solvent, quarternary ammonium salt and first alkali to form compound of formula (IV). The compound of formula (IV) is further treated with a second solvent and a second alkali to form compound of formula (I). The present invention also relates to the preparation of salt of compound of formula (IV) that is Cleistanthin A acetate.

La présente invention concerne un procédé de préparation du composé de formule (I) qui est la cleistanthine A. Le procédé comprend les étapes consistant à faire réagir le composé de formule (II) avec le composé de formule (III) en présence d'un premier solvant, un sel d'ammonium quaternaire et un premier alcali pour former le composé de formule (IV). Le composé de formule (IV) est traité en outre avec un second solvant et un second alcali pour former la composé de formule (I)/ La présente invention concerne également la préparation d'un sel du composé de formule (IV) qui est l'acétate de cleistanthine A.

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