Isatin derivatives, processes for the preparation thereof and pharmaceutical composition comprising the same

Abstract

A compound of the general formula: ##STR1## wherein R.sup.1 and R.sup.2 are hydrogen, halogen, lower alkyl, lower alkoxy, halo (lower) alkyl, lower alkanoylamino, lower alkoxyalylamino, or a 5 to 6 membered saturated or unsaturated heterocyclic group having at least one imino group, and selected from the group consisting of pyrrolidinyl, pyrrolinyl, imidazolidinyl, piperazinyl, piperidyl, and morpholynyl, or R.sup.1 and R.sup.2 are combined together to form a benzene ring, R.sup.3 is oxo or a group of the formula .dbd.N--OR.sup.5, in which R.sup.5 is hydrogen or lower alkyl, R.sup.4 is mono- or di- or triphenyl (lower) alkyl, A is C.sub.1 to C.sub.7 alkylene and its hydroxy derivatives, Y is (C.sub.1 to C.sub.3) alkylene, or a pharmaceutically acceptable salt thereof. Said compounds having antiallergic properties represent inclusively all of the possible optical and/or geometrical isomers due to the asymmetric carbon and carbon-nitrogen double bond.

Dependencies are inferred from the claim text.