| abstract |
Abstract of the Disclosure. The invention relates to a new synthesis for the preparation of tetracyclic compounds of the general formula: I as well as the pharmaceutically acceptable salts thereof, in which: n is the number 1 or 2, m is the number 1, if n = 2 and the number 2, if n = 1, R1 and R2 stand for hydrogen, hydroxy, halogen, lower alkyl (1-4 C), lower alkoxy (1-4 C) or tri-fluoromethyl and R3 represents hydrogen, alkyl (1-6 C), aralkyl (7-10 C) or an amino alkyl group (1-6 C), in which the nitrogen atom has been substituted by two alkyl groups (1-4 C), or the nitrogen atom forms part of a heterocyclic 5- or 6-membered ring, having valuable biological properties. |