abstract |
The present invention relates to compounds of formula (I), processes for their preparation and methods for their use for the preparation of compounds of formula (II). [Chemical 1] (Wherein R 1 , R 2 , R 3 , R 5 , R 6 , X and n are as defined in the specification) The present invention also discloses the preparation of a compound of formula (III). Wherein R 1 , R 2 , R 7 , R 8 , R 9 and n are as defined in the specification. The present invention also relates to certain compounds of formula 4 and formula 6 used to produce compounds of formula (I). (Wherein R 1 , R 2 , R 5 , X and n are as defined in the specification) |