| 摘要 |
Compounds of the formula WHEREIN R1 and R2 may be the same or different and selected form the class consisting of alkyl groups of one to three carbon atoms, including isopropyl, R3, R4, R5, R6 and R7 may be the same or different and each selected from the class consisting of a hydrogen atom, straight and branched alkyl groups of one to three carbon atoms, straight and branched alkoxy groups of one to three carbon atoms and halogen atoms, at least two of R3, R4, R5, R6 and R7 being hydrogen and at least one of R3 and R7 being hydrogen when m is O; R8 and R9 may be the same or different and each selected from the class consisting of a hydrogen atom and straight and branched alkyl groups of one to three carbon atoms, or when R8 is hydrogen R9 may together with Am form a heterocyclic ring containing a nitrogen atom; Am is an amino group selected from the class consisting of pyrrolidino, piperidino, morpholino and monoalkylamino and dialkylamino groups in which the alkyl radicals are straight or branched and contain one to four carbon atoms; m and n is 0 or 1, at least one of m and n being 0; and therapeutically acceptable salts thereof, processes for their preparation, pharmaceutical preparations containing such compounds and their use as local anesthetics.
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