Process for the production of cyclic diketones

C - Chemistry – Metallurgy – 07 – C

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C07C 45/45 (2006.01) C07C 45/71 (2006.01) C07C 49/403 (2006.01) C07C 49/603 (2006.01) C07C 49/733 (2006.01) C07D 213/50 (2006.01)

Patent

CA 2562152

The present invention relates to a process for the preparation of compounds of formula (I), wherein the substituents are as defined in claim 1, by reacting a compound of formula (II), with a bromine or chlorine source to form a compound of formula (III), wherein X is chlorine or bromine; reacting that compound with water to form the compound of formula (IV), converting that compound, using a compound of formula (V), wherein M+ is the hydrogen cation or an alkali metal ion, alkaline earth metal ion or ammonium ion, into the compound of formula (VI), and treating that compound with a cyanide source in the presence of a base.

La présente invention concerne un procédé de préparation de composés de la formule (I), dans laquelle les substituants ont la notation définie dans la revendication 1, consistant à faire réagir un composé de la formule (II), avec une source de brome ou de chlore pour former un composé de la formule (III), dans laquelle X représente chlore ou brome; à faire réagir ce composé avec de l'eau pour former le composé de la formule (IV), à convertir ce composé, au moyen d'un composé de la formule (V) M+-O--C(O)-Y dans laquelle M+ représente le cation d'hydrogène ou un ion métal alcalin, un ion métal alcalino-terreux ou un ion d'ammonium, en composé de la formule (VI), et à traiter ce composé avec une source de cyanure en présence d'une base.

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