Process for the preparation of cyclic diketones.

摘要

The present invention relates to a process for the preparation of compounds of formula I CHEM wherein the substituents are as defined in claim 1, by conversion of a compound of formula II CHEM to a salt of formula III CHEM reaction of that compound with a compound of formula IV X-C(O)-Q wherein X is a leaving group, to form a compound of formula V CHEM and treatment of that compound in the presence of a base with catalytic amounts of cyanide ions.