| 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. |
