Described herein are compounds with affinity for the 5-HT.sub.6 receptor, which have the general formula: wherein:R.sup.1 is selected from the group consisting of H and C.sub.1-4 alkyl;R.sup.2 is selected from the group consisting of H, C.sub.1-4 alkyl and benzyl;-- -- -- represents a single or double bond;R.sup.3 is selected from the group consisting of COR.sup.5 and SO.sub.2 R.sup.5 ;R.sup.4a is selected from the group consisting of H, OH, halo, C.sub.1-4 alkyl and C.sub.1-4 alkoxy;R.sup.4b is selected from the group consisting of H, hydroxy, halo, C.sub.3-7 cycloalkyloxy, C.sub.1-4 alkoxy, C.sub.1-4 alkyl, benzyloxy, phenoxy, trifluoromethyl, trifluoromethoxy and vinyl;R.sup.4c is selected from the group consisting of H, OH, halo, C.sub.1-4 alkyl and C.sub.1-4 alkoxy;R.sub.4d is selected from the group consisting of H, OH, halo, C.sub.1-4 alkyl and C.sub.1-4 alkoxy; andR.sup.5 is selected from the group consisting of phenyl, pyridyl, thienyl, quinolinyl and naphthyl which are optionally substituted with 1-4 substituents selected from C.sub.1-4 alkoxy, C.sub.1-4 alkyl, halo, nitro, trifluoromethyl, trifluoromethoxy, 1,2-methylenedioxy, C.sub.1-4 alkylcarbonyl, C.sub.1-4 alkoxycarbonyl and C.sub.1-4 alkylS--. Also described is the use of these compounds as pharmaceuticals to treat indications where inhibition of the 5-HT.sub.6 receptor is implicated, such as schizophrenia.