| abstract |
The present invention relates to a process for the preparation of a compound of formula (I) wherein R1, R2, and R3 are as defined in claim 1 of the patent application, the process comprising: a) in the presence of an inert organic solvent Adding a compound □ of formula II to a mixture comprising an organic nitrite having the formula III (R4-ON=O(III)), wherein R4 is a C1-C8 alkyl group having a compound of formula IV And □ and an inert organic solvent; b) reacting the obtained compound of formula V with H2N-O-CH3 to form a compound of formula VII, □c) reducing a compound of formula VII to a compound of formula VIII □ d) and reacting a compound of formula VIII with a compound of formula IX wherein R* is halogen, hydroxy or C1-6 alkoxy to form a compound of formula I. |