| abstract |
The invention relates to a process for the preparation of compounds of the general formula (I) and isomers thereof, which comprises, for example, treating a compound of the general formula (IV) with an acid of the general formula and if necessary with a dehydrating agent. The compounds prepared by the process according to the invention possess valuable therapeutic, in particular local anesthetic, antidepressant, potvillo-sedative, smooth muscle relaxant and analgesic properties. |