Heterocyclische Verbindungen Verfahren zu ihrer Herstellung und diese Verbindungen enthaltende Arzneimittel

Indole derivatives of the general formula (I) are disclosed: (I) where R1 is H or an alkyl or alkenyl group, R2 is H, or an alkyl, alkenyl, aryl, aralkyl or cycloalkyl group; R3 is H or an alkyl group; R4 and R5 are independently H or an alkyl or propenyl group or together form an aralkylidene group; and Alk is an optionally substituted alkylene chain; and their physiologically acceptable salts and solutes. These compounds are potentially useful for the treatment of migraine and may be formulated as pharmaceutical compositions in conventional manner. Various methods for the production of the compounds are disclosed including a Fischer-indole cyclization process.