Process for preparing fused ring compounds having nitrogen as the bridgehead atom

摘要

Compounds of the formula IMAGE as well as the salts of these compounds formed with acids or bases, are prepared by cyclising an isopropylidene- 2-heteroarylaminomethylene malonate of the formula III, as it is defined in claim 1, in the presence of an acid condensing agent and adding a compound of the general formula V IMAGE in which the meaning of R is defined in claim 1, to the reaction mixture. IMAGE