Benzoheterocyclicalkyl derivatives of 2,4,9-triazaspiro[5,5]undecan-1,3,5-trione in which the benzoheterocyclic moiety is thianaphthemyl or benzofuranyl, optionally substituted by chloro, bromo, fluoro, methyl, methoxy or trifluoromethyl, have neuroleptic activity. The compounds are generally prepared from either the benzoheterocyclicalkyl halide by reaction with the appropriate amine or the benzoheterocyclic amine by condensation with a 5,5-bis( beta -haloethyl)barbituric acid.
BENZOHETEROCYCLICALKYL DERIVATIVES OF 2,4,9-TRIAZASPIRO(5,5)UNDECAN-1,3,5-TRIONE