Amphoteric Drugs. II. Synthesis and Antiallergic Activity of (4-(5H-Dibenzo(a,d)cyclohepten-5-ylidene)piperidino)alkanoic Acid Derivatives and Related Compounds.
Piperidine compounds, method for preparation thereof, and a pharamceutical composition comprising the same
申请人:HOKURIKU PHARMACEUTICAL CO., LTD.
公开号:EP0451772A1
公开(公告)日:1991-10-16
Novel piperidine compounds represented by the following formula (I):
wherein Y represents an alkylene group having 1 to 7 carbon atoms; A is a group represented by formula I-a or formula I-b:
wherein X represents -CH₂-S- or -S-; and R represents a hydrogen atom or a lower alkyl group with a proviso that A is a group represented by formula I-a, or R represents a hydrogen atom with a proviso that A is a group represented by formula I-b and pharmacologically acceptable salts thereof are disclosed. Also disclosed are a method for preparing the same; a pharmaceutical composition comprising the same; an antiallergic agent and an agent for bronchial asthma comprising the same; and a method for treatment of an allergic disease or bronchial asthma comprising the step of administering the same.
Amphoteric Drugs. II. Synthesis and Antiallergic Activity of (4-(5H-Dibenzo(a,d)cyclohepten-5-ylidene)piperidino)alkanoic Acid Derivatives and Related Compounds.
A simple method of transforming clalssical tricyclic antihistaminics into nonsedative antiallergic agents with equal potency in rats and guinea-pigs is described. A series of [4-(5H-dibenzo[a, d]cyclohepten-5-ylidene)-piperidino]alkanoic acid derivatives (6a) and related compounds (6b-f) were synthesized and examined for antiallergic and antihistaminic activities and effects on the central nervous system (CNS) in comparison with the corresponding N-methyl derivatives (2a-f). N-Alkylcarboxylic acids (6a-f) showed stronger inhibitory effects on 48h homologous passive cutaneous anaphylaxis (PCA) in rats than 2a-f, and also were less effective in prolongation of the sleeping time on hexobarbital-induced anesthesia in mice in comparison with 2a-f. As a result of further modification, it was found that introduction of an oxygen atom into the central ring of the tricyclic system in amphoteric compounds enhanced their antiallergic and antihistaminic activities. 3-[4-(6H-Dibenz[b, e]oxepin-11-ylidene)piperidino]propionic acid (6c) exhibited strong inhibitory effects on 48h homologous PCA in rats (ED50=0.067mg/kg, p.o.) and on histamine-induced bronchoconstriction in anesthetized guinea-pigs (ED50=0.0085mg/kg, p.o.), and thus is a promising candidate as an antiallergic agent.