abstract |
The present invention relates a novel process for preparing a compound of Formula I, wherein, R 1 , R 2 , R 3a , R 3b , R 3c , R 4 , R 5 , R 6 , R 7 and Z are as defined in the description. The process comprises a novel and inventive step of converting a dione of Formula II into an isatoic anhydride of Formula V in a single step, wherein, R 2 is F, Cl, Br or I; R 1 , R 3a , R 3b , R 3c , R 4 , R 5 , R 6 , R 7 and Z are as defined in the description. |