The invention relates to a new synthesis for the preparation of tetracyclic compounds of the general formula: ##STR1## 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, R.sub.1 and R.sub.2 stand for hydrogen, hydroxy, halogen, lower alkyl (1-4 C), lower alkoxy (1-4 C) or trifluoromethyl and R.sub.3 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.
该发明涉及一种新的合成方法,用于制备通式为:##STR1## 的四环化合物及其药学上可接受的盐,其中:n为数字1或2,m为数字1,如果n=2,则为数字2,如果n=1,则为数字2,R.sub.1和R.sub.2代表氢、羟基、卤素、低碳基(1-4 C)、低碳氧基(1-4 C)或三
氟甲基,R.sub.3代表氢、烷基(1-6 C)、芳基烷基(7-10 C)或
氨基烷基(1-6 C),其中氮原子被两个烷基(1-4 C)取代,或氮原子是五元或六元杂环的一部分,具有有价值的
生物学性质。