| 摘要 |
The present invention relates to synthetic routes to prepare a compound of the formula
wherein R 1 is halogen, C 1-6 halogenalkyl, C 1-6 alkoxy-C 1-6 alkyloxy or C 1-6 alkoxy-C 1-6 alkyl; R 2 is halogen, C 1-4 alkyl or C 1-4 alkoxy; R 3 and R 4 are independently branched C 3-6 alkyl; and R 5 is cycloalkyl, C 1-6 alkyl, C 1-6 hydroxyalkyl, C 1-6 alkoxy-C 1-6 alkyl, C 1-6 alkanoyloxy-C 1-6 alkyl, C 1-6 aminoalkyl, C 1-6 alkylamino-C 1-6 alkyl, C 1-6 dialkylamino-C 1-6 alkyl, C 1-6 alkanoylamino-C 1-6 alkyl, HO(O)C-C 1-6 alkyl, C 1-6 alkyl-O-(O)C-C 1-6 alkyl, H 2 N-C(O)-C 1-6 alkyl, C 1-6 alkyl-HN-C(O)-C 1-6 alkyl or (C 1-6 alkyl) 2 N-C(O)-C 1-6 alkyl; or a pharmaceutically acceptable salt thereof as well as key intermediates obtained when following these routes as well as their preparation. |
