.beta.-carboline-3-hydroxyalkylcarboxylic acid ester derivatives, process for their production and their use in pharmaceutical agents

Compounds of formula I ##STR6## in which R.sup.A is halogen, --CHR.sup.1 --R.sup.2 or --OR.sup.5, and

• n is 1 or 2,
• wherein
• R.sup.1 is hydrogen or C.sub.1-4 -alkyl,
• R.sup.2 is hydrogen, C.sub.1-4 -alkyl, O-C.sub.1-4 -alkyl or a phenyl, benzyl or phenoxy radical, optionally substituted 1 to 3 times by halogen, nitro, cyano, C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, trifluoromethyl, -SO.sub.2 -C.sub.1-4 -alkyl, amino and C.sub.1-4 -alkoxycarbonyl group(s),
• R.sup.5 is hydrogen, C.sub.1-4 -alkyl, C.sub.3-7 -cycloalkyl or a phenyl, benzyl or hetaryl radical optionally substituted 1 to 3 times by halogen, nitro, cyano, C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, trifluoromethyl, -SO.sub.2 -C.sub.1-4 -alkyl, amion and C.sub.1-4 -alkoxycarbonyl group(s), wherein the hetaryl radical is a pyridine, pyrimidine, pyrazine, pyridazine, triazine, furan, thiophene, pyrrole, thiazole, imidazole, quinoline, isoquinoline or quinoxaline radical,
• R.sup.4 is hydrogen, C.sub.1-4 -alkyl or C.sub.1-4 -alkoxy-C.sub.1-2 -alkyl, and
• R.sup.3 is a straight-chain or branched C.sub.1-6 -alkyl, that is substituted one to four times with OR.sup.6,
• wherein
• R.sup.6 is hydrogen, C.sub.1-4 -alkyl or a hydroxy protective group, or isomers or pharmaceutically acceptable acid addition salts thereof.