Piperidine derivatives as 5-HT.sub.4 receptor antagonists

Abstract

Compounds of formula (I): ##STR1## wherein X.sup.g is O, S, SO, SO.sub.2, CH.sub.2, CH, N or NR wherein R is hydrogen or C.sub.1-6 alkyl; A is a saturated or unsaturated polymethylene chain of 2-4 carbon atoms; R.sub.1.sup.g and R.sub.2.sup.g are hydrogen or C.sub.1-6 alkyl; R.sub.3.sup.g is hydrogen, halo, C.sub.1-6 alkyl, amino, nitro or C.sub.1-6 alkoxy; R.sub.4.sup.g is hydrogen, halo, C.sub.1-6 alkyl or C.sub.1-6 alkoxy, Y is O or NH, or CO--Y together are a heterocyclic bioisostere; Z is of sub-formula: ##STR2## wherein --(CH.sub.2).sub.n.sup.1 is attached at carbon; and n.sup.1 is 0, 1, 2, 3 or 4; q is 0, 1, 2 or 3; R.sub.a is a straight or branched chain alkylene of chain length 1-6 carbon atoms terminally substituted by R.sub.7 wherein R.sub.7 is 3 to 8 membered heterocyclyl, 5 or 6 membered monocyclic heteroaryl or 9 or 10 membered fused bicyclic heteroaryl linked through carbon, or R.sub.7 is C.sub.2-7 alkoxycarbonyl or secondary or tertiary hydroxy substituted C.sub.1-6 alkyl; and R.sub.6 is hydrogen or C.sub.1-6 alkyl; are useful as 5HT.sub.4 receptor antagonists.

Dependencies are inferred from the claim text.