| abstract |
The invention relates to a process for preparing the products of general formula (I): (I) <IMG> where R is hydrogen, alkyl (1-4C) or = CH2, the wavy line joining R to the ring E is a single bond if R is hydrogen or an alkyl, or a double bond if R is = CH2, the dotted line represents a possible endo double bond in 14-15 if R is hydrogen or alkyl, in all the isomeric forms, and their salts with acids . These products are useful as medicines, in particular oxygenators and cerebral vasoregulators. |