| abstract |
Formula (1) [Chemical 1] Wherein R 1 is hydrogen, halo, C1-C4 alkyl group, C1-C4 alkyl halide group, C1-C4 alkoxy-C2-C4 alkyl group, C2-C4 alkenyl group, C2-C4 alkynyl. Represents a group or a C3-C7 cycloalkyl group; R 2 represents the formula (1) ′ or the formula (1) ″ [Chemical 2] And a compound in which R 3 represents hydrogen, a C1-C4 alkyl group, a C1-C4 alkoxy-C2-C4 alkyl group or a C7 cycloalkyl group; or a pharmaceutically acceptable salt thereof, Solvate. Processes for preparing the above compounds and novel intermediates are also claimed. Such compounds are useful for the treatment of neuropathic pain and central nervous system disorders. [Selection figure] None |