Abstract: Described herein are 5-HT2 receptor-selective compounds of Formula I: ##STR1## wherein: A and B are independently selected, optionally substituted, saturated or unsaturated 5- or 6-membered, homo- or heterocyclic rings;X.sub.1 is selected from CH.sub.2, O, NH, S, C.dbd.O, CH--OH, CH--N(C.sub.1-4 alkyl).sub.2, C.dbd.CHCl, C.dbd.CHCN, N--C.sub.1-4 alkyl, N-acetyl, SO.sub.2 and SO;X.sub.2 - - - is selected from N.dbd., CH.sub.2 --, CH.dbd., C(O)--, O--, and S--;R.sub.1 is C.sub.1-6 alkyl optionally substituted with a substituent selected from OH, halo, C.sub.1-4 alkyl and C.sub.1-4 alkoxy; andR.sub.2, R.sub.3 and R.sub.4 are independently selected from H and R.sub.1 ;and acid addition salts, solvates and hydrates thereof.

Abstract: Described herein are D4 receptor-selective compounds of the general formula: ##STR1## wherein: A and B are independently selected, optionally substituted, saturated or unsaturated 5- or 6-membered, homo- or heterocyclic rings;X.sub.1 is selected from CH.sub.2, O, NH, S, C.dbd.O, CH--OH, CH--N(C.sub.1-4 alkyl).sub.2, C.dbd.CHCl, C.dbd.CHCN, N--C.sub.1-4 alkyl, N-acetyl, SO.sub.2 and SO;X.sub.2 - - - is selected from N.dbd., CH.sub.2 --, CH.dbd., C(O)--, O--, and S--;Y is selected from CH and N;Z is cyanoR.sub.1 represents C.sub.1-4 alkyl;m is 0, 1, 2 or 3;n is 0, 1 or 2;q is 1 or 2; andD is a 5, 6 or 7-membered, saturated or unsaturated, homo- or heterocyclic ring; and acid addition salts, solvates and hydrates thereof. Their use as ligands for dopamine receptor identification and in a drug screening program, and as pharmaceuticals to treat indications in which the D4 receptor is implicated, such as schizophrenia, is also described.

Abstract: Described herein are D4 receptor-selective compounds of the general formula: ##STR1## wherein: A and B are independently selected, optionally substituted, saturated or unsaturated 5- or 6-membered, homo- or heterocyclic rings;X.sub.1 is selected from CH.sub.2, O, NH, S, C.dbd.O, CH--OH, CH--N(C.sub.1-4 alkyl).sub.2, C.dbd.CHCl, C.dbd.CHCN, N--C.sub.1-4 alkyl, N-acetyl, SO.sub.2 and SO;X.sub.2 . . . is selected from N.dbd., CH.sub.2 --, CH.dbd., C(O)--, O--, and S--;Y is selected from N and CH;R.sub.1 represents C.sub.1-4 alkyl;n is 0, 1 or 2;q is 1 or 2; andZ is C.sub.5-10 alkyl optionally substituted with OH, halo, C.sub.1-4 alkyl or C.sub.1-4 alkoxy and optionally incorporating a heteroatom selected from O, N and S;and acid addition salts, solvates and hydrates thereof. Their use as ligands for dopamine receptor identification and in a drug screening program, and as pharmaceuticals to treat indications in which the D4 receptor is implicated, such as schizophrenia, is also described.

Abstract: Described herein are D4 receptor-selective compounds of the general formula: ##STR1## wherein: A and B are independently selected, optionally substituted, saturated or unsaturated 5- or 6-membered, homo- or heterocyclic rings;X.sub.1 is selected from CH.sub.2, O, NH, S, C.dbd.O, CH--OH, CH--N(C.sub.1-4 alkyl).sub.2, C.dbd.CHCl, C.dbd.CHCN, N-C.sub.1-4 alkyl, N-acetyl, SO.sub.2 and SO;X.sub.2 -- is selected from N.dbd., CH.sub.2 --, CH.dbd., C(O)--, O--, and S--;R.sub.1 represents C.sub.1-4 alkyl;Y is selected from CH and N;n is 0, 1 or 2;q is 1 or 2;R.sub.2 is C.sub.1-6 alkyl optionally incorporating a heteroatom selected from N, O and S;D is cyclohexane or benzene; andE is a saturated or unsaturated 5- or 6-membered heterocycle incorporating 1, 2 or 3 heteroatoms selected from O, N, and S, wherein E is optionally substituted with 1 or 2 substituents selected from halogen, C.sub.1-4 alkyl and halogen-substituted C.sub.1-4 alkyl;and acid addition salts, solvates and hydrates thereof.