| abstract |
The present invention relates to synthetic routes to prepare a compound of the formula (A); wherein R1 is halogen, C1-6halogenalkyl, C1-6 alkoxy-C1-6 alcoxy or C1-6alkoxy-C1-6alkyl; R2 is halogen, C1-4alkyl or C1-4alkoxy; R3 and R4 are independently branched C3-6alkyl; and R5 is cycloalkyl, C1-6alkyl, C1-6hydroxyalkyl, Cl-6alkoxy-C 1-6alkyl, C1-6alkanoyloxy-C1-6alkyl, C1-6aminoalkyl, C1-6alkylamino-C1-6alkyl, Cl-6dialkylamino-C1-6alkyl, C1-6alkanoylamino C1-6alkyl, HO(O)C-Cl-6alkyl, C1-6alkyl-O-(O)C-C1-6alkyl, H2N-C(O)-Cl-6alkyl, C1-6alkyl-HNC(O)-C1-6alkyl or (C1-6alkyl)2N-C(O)-C1-6alkyl; or a pharmaceutically acceptable salt thereof as well as key intermediates obtained when following these routes as well as their preparation. |