Piperazine derivatives and pharmaceuticals containing the same

Abstract

A piperazine derivative represented by the following formula: ##STR1## or a pharmaceutically acceptable salt thereof. The compound according to the present invention has strong anti-histaminic and anti-allergic affects and a high degree of safety, and is useful as an anti-histaminic agent, an anti-allergic agent and/or an anti-asthmatic drug. Also disclosed are pharmaceutical compositions containing the compound of formula 1 and a method for the treatment of allergic diseases comprising administering the claimed compound.

Description

This application is a 371 of PCT/JP92/00833 filed Jul. 2,1992.

1. Technical Field

The present invention relates to novel piperazine derivatives and pharmaceuticals containing the same.

2. Background Art

Numerous piperazine derivatives have heretofore been synthesized and studied for various pharmacological effects. Among them, those having both antiallergic and antihistamic effects are known.

For example, compounds having the diphenylmethylpiperazine skeleton are disclosed in Japanese Patent Laid-Open Nos. 32474/1981, 149282/1982, 11072/1991 and the like. These compounds, however, are accompanied by one or more drawbacks such that their pharmacological effects are still insufficient and/or they are questionable in safety.

With a view toward preparing a compound having still better antiallergic and antihistamic effects and in addition, having a high degree of safety, the present inventors have carried out an extensive investigation. As a result, they have completed the present invention.

DISCLOSURE OF THE INVENTION

The present invention relates to a piperazine derivative represented by the following formula (I): ##STR2## wherein B represents a phenyl or pyridinyl group, m stands for an integer of 2 or 3, p stands for an integer of 1 or 2, R.sup.1 represents a hydrogen or halogen atom, A represents --COOR.sup.2, --Y--(CH.sub.2).sub.n , --R.sup.3, ##STR3## in which R.sup.2 represents a hydrogen atom or a lower alkyl group, Y represents a sulfur or oxygen atom, NH or .rarw.CONH-- (.rarw. indicates a bond with a (CH.sub.2).sub.m group), n stands for an integer of 0 to 3, R.sup.3 represents a cyano, amino, hydroxymethyl, 1H-tetrazole, 1-imidazolylcarbonyl, --CO--COOR.sup.4, --(CH.sub.2).sub.1 --COOR.sup.4 or --(CH.sub.2).sub.1 --CONH--R.sup.5 group (R.sup.4 : hydrogen atom or lower alkyl group, l: integer of 0 to 3; and R.sup.5 : 1H-tetrazole, thiazol-2-yl, thiazolin-2-yl, triazol-5-yl, trimethoxyphenyl or 3,5-dimethyl-4-hydroxyphenyl group), X represents CH or a nitrogen atom and R.sup.6 represents a hydrogen atom or a lower alkoxyl group, ##STR4## with the proviso that either case where R.sup.1, B, p, m and A represent a hydrogen atom, a phenyl group, 1, 2 and --NH--C.sub.6 H.sub.4 --COOR.sup.4, respectively, or where R.sup.1, B, p, m and A represent a chlorine atom, a phenyl group, 1, 2 and --O--CH.sub.2 COOH, respectively is excluded; or a salt thereof.

In addition, the present invention also relates to an antihistamic agent and an antiallergic agent each containing the piperazine derivative (I) as an active ingredient.

In the formula (I), examples of the lower alkyl group represented by R.sup.2 or R.sup.4 include C.sub.1-4 linear or branched alkyl groups, those of the lower alkoxyl group represented by R.sup.6 include C.sub.1-4 linear or branched alkyl groups, and those of the halogen atom represented by R.sup.1 include chlorine, bromine, fluorine and iodine atoms.

The piperazine derivative (I) according to the present invention can be converted to a pharmaco-logically-acceptable salt thereof, for example, an acid-addition salt such as the hydrochloride, nitrate, sulfate, maleate, fumarate, oxalate, citrate, hydrobromate, succinate, sulfaminate, mandelate, malonate and phosphate or a base salt such as the sodium salt, potassium salt, lithium salt or calcium salt.

The compounds (I) according to the present invention may have stereoisomers such as optical isomers because they may contain an asymmetric carbon atom. It is to be noted that these isomers are all embraced by the present invention.

The compounds (I) according to the present invention have excellent antihistamic and antiallergic effects and also a high degree of safety as will be described later, so that they are effective as therapeutic agents for various allergic diseases, for example, as anti-inflammatory agents, therapeutics for nephritis, hepatitis or pancreatitis, preventives and/or therapeutics for respiratory diseases, and anti-asthmatic drugs.

BEST MODES FOR CARRYING OUT THE INVENTION

The compound (I) of this invention can be prepared, for example, in accordance with the following process:

Process A: ##STR5## wherein R.sup.1, B, p, m and A have the same meanings as defined above and Z is a halogen atom.

In other words, the compound (I) according to the present invention can be prepared by reacting a piperazine derivative represented by the formula (II) with a compound represented by the formula (III) in the presence of a base.

It is preferred to conduct the above reaction in a solvent which does not affect the reaction. Examples of the solvent include water; esters such as methyl acetate and ethyl acetate; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran and dioxane; ketones such as acetone and methyl ethyl ketone; halogenated hydrocarbons such as dichloromethane and chloroform; aromatic hydrocarbons such as benzene, toluene and xylene; acetonitrile; dimethylsulfoxide; and dimethylformamide. They may be used either singly or in combination. The reaction temperature may be varied depending on the starting compounds employed. In general, it is advantageous to select a temperature within a range of from 0.degree. C. to a reflux temperature under normal pressure.

Examples of the base include carbonates such as potassium carbonate, sodium carbonate, sodium hydrogencarbonate and potassium hydrogencarbonate; alkali metal hydroxides such as potassium hydroxide, sodium hydroxide and lithium hydroxide; and organic bases such as triethylamine, diisopropylamine, DBU (1,8-diazabicyclo[5.4.0]-7-undecene).

When the compound represented by the formula (III) is a carboxylic acid ester, the corresponding carboxylic acid can be obtained by subjecting the invention compound (I), which has been prepared by the above reaction, to hydrolysis in a manner known per se in the art. The resulting carboxylic acid is then condensed with carbodiimidazole, 5-amino-1H-tetrazole, 2-aminothiazole, 2-aminothiazolidine, 5-aminotriazole, 3,4,5-trimethoxyaniline or 3,5-dimethyl-4-hydroxyaniline, leading to the preparation of another invention compound.

It is desirable to conduct the above condensation, in a manner known to date, in a solvent which does not affect the reaction. Examples of the solvent include esters such as methyl acetate and ethyl acetate; amides such as dimethylformamide and diethylformamide; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran and dioxane; halogenated hydrocarbons such as dichloromethane and chloroform; aromatic hydrocarbons such as benzene, toluene and xylene; acetonitrile; and dimethylsulfoxide. These solvents can be used either singly or in combination. The reaction temperature may be varied depending on the starting compounds employed. In general, it is advantageous to select a temperature within a range of from 0.degree. C. to a reflux temperature under normal pressure.

When the compound represented by the formula (III) is a cyano-containing compound, the invention compound (I) prepared by the above reaction can be converted to another invention compound containing a 1H-tetrazole group by reacting the invention compound (I) with tri-n-butyltin azide in the presence of a base. It is desirable to conduct the reaction in a solvent which does not affect the reaction. Examples of the solvent include esters such as methyl acetate and ethyl acetate; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran and dioxane; halogenated hydrocarbons such as dichloromethane and chloroform; aromatic hydrocarbons such as benzene, toluene and xylene; and dimethylformamide. These solvents can be used either singly or in combination. The reaction temperature may be varied depending on the starting compounds employed. In general, it is advantageous to select a temperature within a range of from room temperature to a reflux temperature under normal pressure. As the base, those similar to the bases exemplified above can be employed.

Process B:

The invention compound can also be prepared by the following process: ##STR6## wherein Z, R.sup.1, B, p, m and A have the same meanings as defined above.

In other words, the compound (I) according to the present invention can be prepared by subjecting a compound represented by the formula (IV) and a compound represented by the formula (V) to condensation in the presence of a base.

It is preferred to conduct the above reaction in a solvent which does not affect the reaction. Examples of the solvent include esters such as methyl acetate and ethyl acetate; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran and dioxane; ketones such as acetone and methyl ethyl ketone; halogenated hydrocarbons such as dichloromethane and chloroform; aromatic hydrocarbons such as benzene, toluene and xylene; acetonitrile; dimethylsulfoxide; and dimethylformamide. They can be used either singly or in combination. The reaction temperature may be varied depending on the starting compounds employed. In general, it is advantageous to select a temperature within a range of from 0.degree. C. to a reflux temperature under normal pressure. As the base, bases similar to those exemplified in the Process A are usable.

When the compound represented by the formula (V) is a carboxylic acid ester or a cyano-containing compound, the invention compound so obtained can be converted to a corresponding invention compound of another type by treating it in a similar manner to Process A.

When the starting compound (II) or (IV) has an asymmetric carbon atom in Process A or Process B, the invention compound (I) so obtained includes corresponding stereoisomers.

Among the invention compounds (I) obtained as de-scribed above, the followings are representatives ones except for the compounds to be described in Examples.

2-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]-N-3,4,5-trimethoxyphenylbenzamide 2-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]-N-(3,5-dimethyl-4-hydroxyphenyl)-benzamide 3-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]benzoic acid 3-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-benzamide 2-[[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propyl]thio]benzoic acid 2-[[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propyl]thio]-N-1H-tetrazol-5-yl-benzamide 2-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]nicotinic acid 2-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-nicotinamide 3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]benzoic acid 3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1 -homopiperazinyl]ethyl]-N-1H-tetrazol-5-yl-benzamide Ethyl 4-[[2 -[4-[(4-chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethyl]thio]benzoate 4-[[2-[4-[( 4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethyl]thio]-N-1H-tetrazol-5-yl-benzamide 3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]phenylacetic acid 3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]-N-1H-tetrazol-5-yl-phenylacetamide 4-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]-N-1H-tetrazol-5-yl-anthranylamide Propyl 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]nicotinate 2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]-N-1H-tetrazol-5-yl-nicotinamide 2-[[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethyl]thio]acetic acid 1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethyl]-3-indolecarboxylic acid 1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethyl]-N-1H-tetrazol-5-yl-3 -indoleamide Butyl 4-[3-[4-[(4-chlorophenyl)phenylmethyl]-1-homopiperazinyl]propoxy]benzoate 4-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1homopiperazinyl]propoxy]-N-1H-tetrazol-5-yl-benzamide Methyl 2-[3-[4-[(4-chlorophenyl)phenylmethyl]-1-homopiperazinyl]propoxy]naphthoate 2-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]propoxy]naphthoic acid 4-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]propoxy]-N-1H-tetrazol-5-yl-naphthamide 2-[2-[4-(Diphenylmethyl)-l-piperazinyl]ethoxy]-N-1H-triazol-5-yl-benzamide 2-[2-[4-(Diphenylmethyl)-1-piperazinyl]ethyl]thio]-N-1H-tetrazol-5-yl-benzamide 2-[2-[4-(Diphenylmethyl)-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-nicotinamide 1-[2-[4-(Diphenylmethyl)-1-piperazinyl]ethyl]-N-1H-tetrazol-5-yl-2-indoleamide 4-[2-[4-(Diphenylmethyl)-1-piperazinyl]ethoxy]-[N-1H-tetrazol-5-yl]-benzene 4-[2-[4-(Diphenylmethyl)-1-piperazinyl]ethoxy]-benzamide 4-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-N-3,4,5-trimethoxyphenyl-benzamide 4-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-thiazol-2-yl-benzamide 4-[3-[4-(Diphenylmethyl)-1-piperazinyl]propyl]-thio]benzoic acid 4-[3-[4-(Diphenylmethyl)-1-piperazinyl]propyl]-thio]-N-1H-tetrazol-5-yl-benzamide 2-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-anthranilic acid 2-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-anthranilamide 2-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-nicotinic acid 2-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-nicotinamide 1-[3-[4-(Diphenylmethyl)-1-piperazinyl]propyl]-2-indolecarboxylic acid 1-[3-[4-(Diphenylmethyl)-1-piperazinyl]propyl]-2-N-1H-tetrazol-5-yl-indoleamide 4-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-benzonitrile

Butyl 2-[[3-[4-(diphenylmethyl)-1-piperazinyl]-propyl]thio]acetate

-2-[[3-[4-(Diphenylmethyl)-1-piperazinyl]propyl] -thio]acetic acid

2-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-acetamide 1-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-naphthoic acid 1-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-naphthoamide Ethyl 2-[3-[4-(diphenylmethyl)-1-homopiperazinyl]-propoxy]benzoate 2-[3-[4-(Diphenylmethyl)-1-homopiperazinyl]-propoxy]-N-1H-tetrazol-5-yl-benzamide Methyl 2-[3-[4-(diphenylmethyl)-1-homopiperazinyl]-propoxy]naphthoate 2-[3-[4-(Diphenylmethyl)-1-homopiperazinyl]-propoxy]naphthoic acid 2-[3-[4-(Diphenylmethyl)-1-homopiperazinyl]-propoxy]-N-1H-tetrazol-5-yl-naphthoamide Propyl 3-[2-[4-[2-(4-chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]benzoate 3-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzamide 2-[[2-[4-[2-(4 -Chlorophenyl ) pyridylmethyl ]-1-piperazinyl]ethyl]thio]benzoic acid 2-[[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethyl]thio]-N-1H-tetrazol-5 -yl-benzamide .degree. 2-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]anthranilic acid 2-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-anthranilamide 1-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1piperazinyl]ethyl]-3-ethoxycarbonyl-indole 1-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethyl]-N-1H-tetrazol-5-yl-3-indoleamide 3-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]benzonitrile 4-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]benzoylimidazole 2-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-acetamide 2-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]-1H-tetrazole-5-ylmethyl 4-[3-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]propoxy]benzoic acid 4-[3-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]propyl]-N-1H-tetrazol-5-yl-benzamide Butyl 3-[2-[4-[2-(4-chlorophenyl)pyridylmethyl]-1-homopiperazinyl]ethoxy]benzoate 3-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1 -homopiperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzamide Ethyl 1-[2-[4-[2-(4-chlorophenyl)pyridylmethyl]-1-homopiperazinyl]ethoxy]naphthoate 1-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-homopiperazinyl]ethoxy]naphthoic acid 1-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1homopiperazinyl]ethoxy]-N-1H-tetrazol-5-yl-naphthoamide 2-[3-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-homopiperazinyl]propoxy]benzoic acid 2-[3-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-homopiperazinyl]propoxy]-N-1H-tetrazol-5-yl-benzamide 2-[3-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-homopiperazinyl]propoxy]naphthoic acid 2-[3-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-homopiperazinyl]propoxy]-N-1H-tetrazol-5-yl-naphthoamide 2-[[2-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]-ethyl]thio]benzoic acid 2-[[2-[4-(2-Phenyl-pyridylmethyl]-1-piperazinyl]-ethyl]thio]-N-1H-tetrazol-5-yl-benzamide 2-[2-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]-ethoxy]anthranilic acid 2-[2-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]-ethoxy]-N-1H-tetrazol-5-yl-anthranilamide 2-[2-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]-ethoxy]nicotinic acid 2-[2-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]-ethyl]-N-1H-tetrazol-5-yl-nicotinamide Methyl 2-[3-[4-(2-phenyl-pyridylmethyl)-1-piperazinyl]propoxy]benzoate 2-[3-[4-(2-phenyl-pyridylmethyl)-1-piperazinyl]-propoxy]-N-1H-tetrazol-5-yl-benzamide Propyl 2-[3-[4-(2-phenyl-pyridylmethyl)-1-piperazinyl]propoxy]naphthoate 2-[3-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]-propoxy]naphthoic acid 2-[3-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]-propoxy]-N-1H-tetrazol-5-yl-naphthoamide 3-[2-[4-(2-Phenyl-pyridylmethyl)-1-homopiperazinyl]ethoxy]benzoic acid 3-[2-[4-(2-Phenyl-pyridylmethyl)-1-homopiperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzamide Methyl 1-[2-[4-(2-phenyl-pyridylmethyl)-1-homopiperazinyl]ethoxy]naphthoate 1-[2-[4-(2-Phenyl-pyridylmethyl)-1-homopiperazinyl]ethoxy]naphthoic acid 1-[2-[4-(2-Phenyl-pyridylmethyl)-1-homopiperazinyl] ethoxy]-N-1H-tetrazol-5-yl-naphthoamide Ethyl 2-[3-[4-(2-phenyl-pyridylmethyl)-1-homopiperazinyl]propoxy]benzoate 2-[3-[4-(2-Phenyl-pyridylmethyl)-1-homopiperazinyl]propoxy]-N-1H-tetrazol-5-yl-benzamide Ethyl 2-[3-[4-(2-phenyl-pyridylmethyl)-1-homopiperazinyl]propoxy]naphthoate 2-[3-[4-(2-Phenyl-pyridylmethyl)-1-homopiperazinyl]propoxy]naphthoic acid 2-[3-[4-(2-Phenyl-pyridylmethyl)-1-homopiperazinyl]propoxy]-N-1H-tetrazol-5-yl-naphthoamide

The compound (I) according to the present invention can be formulated into dosage forms suited for oral administration or parenteral administration by adding one or more pharmaceutically-acceptable auxiliary agents thereto.

Solid dosage forms for oral administration include tablets, powders, granules and capsules. The invention compound (I) can be formulated into such a solid preparation by combining it with one or more suitable additives such as excipients, e.g., lactose, mannitol, corn starch or crystalline cellulose; binders, e.g., a cellulose derivative, gum arabic or gelatin; disintegrators, e.g., calcium carboxymethylcellulose; and lubricants such as talc and magnesium stearate. The solid preparation so obtained can be converted into an enteric coated one by coating it with a coating base material such as hydroxypropylmethylcellulose phthalate, hydroxypropylmethylcellulose acetate succinate, cellulose acetate phthalate or a methacrylate copolymer.

Exemplary liquid preparations for oral administration include emulsions, solutions, suspensions, syrups and elixirs. The compound (I) according to the present invention can be prepared in the form of a liquid preparation by combining an inert diluent such as purified water or ethanol. In addition to the inert diluent, auxiliary agents such as a humectant and a suspending agent, a sweetener, a taste improver, an aromatic agent and/or an antiseptic can be added. The compound can also be used in the form of an aerosol preparation which is formulated in a manner known per se in the art.

Examples of the liquid preparation for parenteral administration include injections. The invention compound (I) can be formulated into the form of an injection by combining the compound with water, ethanol, glycerin and a conventional surfactant. Further, the compound can also be used in the form of a surface application drug such as an inhalation, liquid for external use, ophthalmic solution, nasal drops or ointment.

The dosage of the compound (I) of the present invention varies depending on the age, weight, conditions, therapeutic effects, administration method, administration period, etc. In general, it is desirable to orally administer the compound (I) at a daily dosage of 1-500 mg/day, particularly 5-50 mg/day, in 1-3 portions a day or to parenterally administer it at a dosage of 0.1-500 mg/day in one to several portions a day.

EXAMPLE

The present invention will hereinafter be described more specifically by the following examples. It is, however, to be borne in mind that the present invention is by no means limited to or by them. In each table, Ph and Py indicate a phenyl group and a 2-pyridinyl group, respectively.

EXAMPLE 1

Methyl 3-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoate ##STR7##

In acetone, 16.0 g (38 mmol) of 2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl chloride.dihydrochloride and 18.3 g of potassium carbonate were suspended, followed by the addition of 6.9 g (45 mmol) of methyl 3-hydroxybenzoate. The resulting suspension was refluxed at 70.degree. C. for 24 hours. After the reaction mixture was allowed to cool down, 200 ml of water were added, followed by extraction with 200 ml portions of ethyl acetate twice. The ethyl acetate layers were washed with water and dried over anhydrous magnesium sulfate. The solvent was thereafter distilled off. The residue so obtained was purified by chromatography on a silica gel column (ethyl acetate:n-hexane=1:1), whereby 12 g of the title compound were obtained.

Yield: 68%. Melting point (decomposition point): 200.degree.-205.degree. C. (dihydrochloride) MS (m/z): 464(M.sup.+) IR (nujol) cm.sup.-1 : 3400, 2350, 1710 NMR (DMSO-d.sub.6) .delta.: (oxalate) 2.55(4H,brs), 3.23(4H,brs), 3.40(2H,t), 3.85(3H,s), 4.35(2H,t), 4.47 (1H,s), 7.22-7.59(13H,m)

EXAMPLE 2

3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoic acid ##STR8##

In 200 ml of ethanol, 10 g of the methyl 3-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]-ethoxy]benzoate obtained in Example 1 and 50 ml of 10% sodium hydroxide were dissolved, followed by stirring at 50.degree. C. for one hour. After the reaction mixture was allowed to cool down, the solvent was distilled off under reduced pressure. Water (200 ml) was added to the residue, followed by the addition of acetic acid to adjust its pH to 4.0. The resulting mixture was extracted with 200 ml portions of ethyl acetate twice. The ethyl acetate layers so obtained were washed with water and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue so obtained was purified by chromatography on a silica gel column (chloroform:methanol=10:1), whereby 6.6 g of the title compound were obtained.

Yield: 69%. Melting point (decomposition point): 202.degree.-203.degree. C. MS (m/z): 450(M.sup.+) IR (nujol) cm.sup.- : 3400, 1705, 1580 NMR (DMSO-d.sub.6 ) .delta.: 2.77(1H,brs), 3.35-3.42(8H,m), 3.50(2H,t), 4.46(2H,t), 4.51(1H,s), 7.22-7.58(13H,m)

EXAMPLES 3-39

The compounds of Examples 3-39 shown in Tables 1-8 were each obtained in accordance with the procedures of Example 1 or Example 2. The names of the respective compounds will be described below.

EXAMPLE 3

Methyl 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoate

EXAMPLES 4 & 5

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoic acid

EXAMPLE 6

Methyl 4-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoate

EXAMPLE 7

4-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoic acid

EXAMPLE 8

Methyl 2-[2-[4-(diphenylmethyl)-1-piperazinyl]-ethoxy]benzoate

EXAMPLE 9

2-[2-[4-(Diphenylmethyl]-1-piperazinyl]ethoxy]-benzoic acid

EXAMPLE 10

Methyl 2-[3-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]benzoate

EXAMPLE 11

2-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]benzoic acid

EXAMPLE 12

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzyl alcohol

EXAMPLE 13

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzonitrile

EXAMPLE 14

3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzonitrile

EXAMPLE 15

[3-[4-(Diphenylmethyl]-1-piperazinyl]N-propionyl]anthranilic acid

EXAMPLE 16

Methyl 1-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]naphthoate

EXAMPLE 17

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]naphthoic acid

EXAMPLE 18

Methyl 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]naphthoate

EXAMPLE 19

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]naphthoic acid

EXAMPLE 20

3-[1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxycarbonylmethyl]-2-methyl-5-methoxy-indole

EXAMPLE 21

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-2-methyloxycarbonyl-indole

EXAMPLE 22

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-3-indolecarboxylic acid

EXAMPLE 23

Methyl 1-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-2-methyl-5-methoxy-3-indole-acetate

EXAMPLE 24

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-2-methyl-5-methoxy-3-indoleacetic acid

EXAMPLE 25

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-2-indolecarboxylic acid

EXAMPLE 26

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]phenylacetic acid

EXAMPLE 27

Methyl 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]phenylacetate

EXAMPLE 28

Methyl 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]nicotinate

EXAMPLE 29

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]nicotinic acid

EXAMPLE 30

8-[2-[4-(Diphenylmethyl)-1-piperazinyl]ethoxy]-quinolin-N-(1H)-2-one

EXAMPLE 31

2-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]benzoic acid

EXAMPLE 32

Methyl 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]benzoate

EXAMPLE 33

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]benzoic acid

EXAMPLE 34

Methyl 2-[2-[4-(2-phenyl-pyridylmethyl)-1-piperazinyl]ethoxy]benzoate

EXAMPLE 35

2-[2-[4-(2-Phenyl-pyridylmethyl)-1-piperazinyl]ethoxy]benzoic acid

EXAMPLE 36

Ethyl 4-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]butyrate

EXAMPLE 37

4-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]butyric acid

EXAMPLE 38

Methyl 2-[2-[4-(diphenyl)-1-homopiperazinyl]ethoxy]benzoate

EXAMPLE 39

2-[2-[4-(Diphenyl)-1-homopiperazinyl]ethoxy]benzoic acid TABLE 1__________________________________________________________________________EX. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________3 Cl Ph 2 1 ##STR9## Decomposition point 210-214 (Dihydrochloride) 464 IR(nujol):1720 NMR(CDCl.sub.3):(2HCl) 3.56(4H, brs), 3.83(3H, s), 4.04(2H, t), 4.40(4H, brs), 4.63(2H, t), 5.00(1H, s), 6.95-7.88(13H, m)4 Cl Ph 2 1 ##STR10## Decomposition point 216-218 (Dihydrochloride) 450 IR(nujol):1690 NMR(CDCl.sub.3):2.34(4 H, brs), 2.70(2H, t), 2.97(4H, brs), .94(1H, s), 4.03(2H, brs), 6.78-7.81(13H, m)5 Cl Ph 2 1 ##STR11## 193-195 (1/2 Fumarate) 450 IR(nujol):1690 NMR(DMSO-d.sub.6):2.36 (4H, brs), 2.70(4H, brs), 2.82(2H, t), 4.25 (2H, t), 4.33(1H, s), 6.62(1H, s), 6.98-7.61(13H, m), 8.25(2H, brs)6 Cl Ph 2 1 ##STR12## Decomposition point 197-199 (Dihydrochloride) 464 IR(nujol):3400, 1720 NMR(DMSO-d.sub.6 ):(oxalate) 2.54(4H, brs), 3.22(4H, brs), 3.40(2H, t), 4.37(2H, t), 4.47 1H, s), 7.05-7.93(13H, m)7 Cl Ph 2 1 ##STR13## Decomposition point 230-232 (Dihydrochloride) 450 IR(nujol):3400, 1700 NMR(DMSO-d.sub.6 ):2.77(1H, brs), 3.34(8H, brs), 3.50(2H, brs), 4.51(3H, brs), 7.05-7.92(13H, m)__________________________________________________________________________ TABLE 2__________________________________________________________________________EX. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________8 H Ph 2 1 ##STR14## Decomposition point 211-213 (Dihydrochloride) 430 IR(nujol):3380, 1720 NMR(CDCl.sub.3): (2HCl)3.58(4H, brs), 3.83(3H, s), 4.01(4H, brs), 4.48(2H, t), 4.61(2H, t), 5.02(1H, s), 6.95-7.91(14H, m)9 H Ph 2 1 ##STR15## 178-179 (Maleate) 416 IR(nujol):1675 NMR(DMSO-d.sub.6):2.51 (4H, brs), 3.38(4H, brs), 3.46(2H, t), 4.37(2H, t), 4.46(1H, s), 7.04-7.70(14H, m)10 Cl Ph 3 1 ##STR16## 114-117 (Maleate) 478 NMR(DMSO-d.sub.6):2.15(2H, m), 2.30(2H, m), 2.83(2H, brs), 3.15 (2H, brs), 3.31(2H, t), 3.50(2H, m), .78(3H, s), 4.13(2H, t), 4.56(1H, s), 6.14(4H, s), 7.05-7.73(13H, m)11 Cl Ph 3 1 ##STR17## -- powder 464 IR(nujol):3420, 1680 NMR(DMSO-d.sub.6 ):(2HCl)2.21(2H, t), 3.15(4H, brs), 3.35(4H, brs), 3.57(1H, s), 3.60(2H, m), 4.14 (2H, t), 7.03-7.72(14H, m)12 Cl Ph 2 1 ##STR18## powder 436 IR(nujol):3350 NMR(CDCl.sub.3):2.42(4 H, brs), 2.54 (4H, brs), 2.63(1H, s), 2.73(2H, brs), 4.20(2H, brs), 4.22(1H, s) 4.60(2H, s), 6.88-7.35(13H, m)__________________________________________________________________________ TABLE 3__________________________________________________________________________EX. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________13 Cl Ph 2 1 ##STR19## Decomposition point 160 (Oxalate) 431 IR(nujol):2220 NMR(DMSO-d.sub.6):(Ox alate)2.52 (4H, m), 3.25(4H, m), 3.41(2H, t), 4.46(2H, t), 4.49(1H, s), 7.13-7.75(13H, m)14 Cl Ph 2 1 ##STR20## 168-170 431 IR(nujol):2220, 1680 NMR(DMSO-d.sub. 6):(fumarate)2.51 (4H, brs), 3.30(4H, brs), 3.54 (2H, t), 4.39(2H, t), 4.55(1H, s), 6.15(4H, s), 7.24-7.53(13H, m)15 H Ph 2 1 ##STR21## Decomposition point 223 443 IR(nujol):3580, 3450, 1670 NMR(DMSO-d.sub.6):2.70-3.10(6H, m), 2.40-2.50(12H, m), 3.14(2H, t) .36(1H, s), 7.01-7.43(12H, m), 7.95-7.98(1H, m), 8.45-8.48(1H, m)16 Cl Ph 2 1 ##STR22## Decomposition point 177-180 (Dihydrochloride) 514 IR(nujol):3400, 1720, 1600 NMR(CDCl.sub.3):3.54(4H, brs), 3.83 (4H, brs), 4.03(3H, s), 4.43 (2H, brs), 4.72(2H, brs), 4.95 (1H, s), 7.28-7.93(15H, m)17 Cl Ph 2 1 ##STR23## 130-131 500 IR(nujol):3200, 1580, 1410 NMR(CDCl.sub.3):2.42(4H, brs), .53(4H, brs), 2.68(2H, t), 4.22(1H, s), 4.51(2H, t), 7.10-8.35(15H,__________________________________________________________________________ m) TABLE 4__________________________________________________________________________EX. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1),__________________________________________________________________________ NMR(ppm)18 Cl Ph 2 1 ##STR24## Decomposition point 197-200 (Dihydrochlorid e) 514 IR(nujol):3500, 1710, 1600 NMR(CDCl.sub.3):3.75(2H, t), 3.96 (3H, s), 4.12(4H, brd), 4.53 (4H, brd), 4.63(2H, t), 5.05 (1H, s), 7.36-8.33(15H, m)19 Cl Ph 2 1 ##STR25## 192-194 (Dihydrochloride) 500 IR(nujol):3450, 1690, 1600 NMR(DMSO-d.sub.6):(2HCl)3.03 2H, brs), 3.76(5H, brs), 4.45(6H, brt), 7.40-8.34(16H, m)20 Cl Ph 2 1 ##STR26## -- (amorphous) 531 NMR(DMSO-d.sub.6):2.18(4H, brs), 2.29 (3H, s), 2.35(4H, brs), 2.51 (2H, t), 3.59(2H, s), 3.70(3H, s), 4.07(2H, t), 4.21(1H, s), 6.57- 7.42(12H, m), 10.65(1H, brs)21 Cl Ph 2 1 ##STR27## -- (foam) 487 NMR(DMSO-d.sub.6):2.25(4H, brs), 2.46(4H, brs), 2.67(2H, t), 3.81 (3H, s), 4.24(1H, s), 4.30(2H, t), 7.15-7.57(11H, m), 7.54-7.57(1H, m), 8.03-8.06(1H, m), 8.12(1H, s)22 Cl Ph 2 1 ##STR28## Decomposition point 105-110 474 IR(nujol):3350, 1680 NMR(DMSO-d.sub.6):2.28(4H, brs), 2.70(2H, t), 3.35(4H, brs), 4.28(1H, s), 4.32(2H, t), 7.16-7.99(14H, m), 8.03(1H, s)__________________________________________________________________________ TABLE 5__________________________________________________________________________Ex. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1),__________________________________________________________________________ NMR(ppm)23 Cl Ph 2 1 ##STR29## -- (amorphous) 545 IR(nujol): 1730 NMR(DMSO-d.sub.6): 2.25(4H, brs), 2.31 (3H, s), 2.44(4H, brs), 2.50(2H, t), 3.54(3H, t), 3.73(3H, s), 4.12(2H, t), 4.27(1H, s), 6.66-7.44(12H, m)24 Cl Ph 2 1 ##STR30## Decomposition point 198 487 (Decarbo- xylated) IR(nujol): 3350, 1700 NMR(DMSO-d.sub.6): 2.36(3H, s), 2.50 (4H, brs), 2.80(2H, brs), 3.30 (4H, brs), 3.60(2H, s), 3.74(3H, s), 4.54(3H, brs), 6.72-7.45(12H, m), 11.36(1H, brs)25 Cl Ph 2 1 ##STR31## Decomposition point 171-177 429 (Decarbo- xylated) IR(nujol): 3400, 1590 NMR(DMSO-d.sub.6): 2.28(4H, brs), 2.63(2H, t), 3.60(5H, brs), 4.27(1H, s), 4.68(2H, t), 7.09(1H, s), 7.00-7.62(13H, m)26 Cl Ph 2 1 ##STR32## Decomposition point 184 464 IR(nujol): 3400, 1720, 1600 NMR(CDCl.sub.3): 2.51(4H, brs), 2.76 (4H, brs), 2.92(2H, t), 3.56(2H, s), 4.11(2H, t), 4.22(1H, s), 5.45 (1H, brs), 6.77-7.36(13H, m)27 Cl Ph 2 1 ##STR33## Decomposition point 168 478 IR(nujol): 3400, 1720, 1590 NMR(DMSO-d.sub.6): (2HCl)2.60(4H, brs), 2.98(4H, brs), 3.35(2H, t), 3.50 (3H, s), 3.66(2H, s), 4.38(2H, t), 4.82(1H, s), 6.94-7.53(13H,__________________________________________________________________________ m) TABLE 6__________________________________________________________________________Ex. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________28 Cl Ph 2 1 ##STR34## 182-184 465 IR(nujol): 3300, 1720, 1580 NMR(DMSO-d.sub.6): (2HCl)2.87(4H, brs), 3.23(4H, brs), 3.57(2H, t), 3.77(3H, s), 4.67(1H, s), 4.73(2H, t), 7.16-8.41(12H, m)29 Cl Ph 2 1 ##STR35## 173-174 451 IR(nujol): 3150, 1700, 1580 NMR(DMSO-d.sub.6): (2HCl)2.85 (4H, brs), 3.54(4H, brs), 3.66 (2H, t), 4.57(1H, s), 4.70(2H, t), 7.13-8.37(12H, m), 10.20(1H, brs)30 Cl Ph 2 1 ##STR36## Decomposition point 245-247 473 IR(nujol): 3400, 1670, 1610 NMR(DMSO-d.sub.6): (2HCl)3.22 (4H, brs), 3.76(8H, brs), 4.49(1H, s), 6.52-7.92 (14H, m), 11.12(1H, s)31 Cl Py 2 1 ##STR37## -- (amorphous) 451 IR(nujol): 3350, 1690 NMR(DMSO-d.sub .6): 2.35(4H, brs), 2.62(4H, brs), 2.75(2H, t), 4.23(2H, t), 4.45(1H, s), 6.97- 7.78(11H, m), 8.44-8.46(1H, m)32 Cl Ph 2 2 ##STR38## Decomposition point 157 (Dihydrochloride) 478 IR(nujol): 3400, 1720 NMR(DMSO-d.sub .6): (2HCl)2.09(4H, m), 3.19(6H, m), 3.57(1H, s), 3.61(2H, t), 3.69(3H, s), 4.47(2H, t), 7.10-7.74(13H, m)__________________________________________________________________________ TABLE 7__________________________________________________________________________Ex. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________33 Cl Ph 2 2 ##STR39## Decomposition point 164 (Dihydrochloride) 464 IR(nujol): 3350, 1700 NMR(DMSO-d.sub. 6): (2HCl)2.09 (4H, m), 3.29(6H, m), .57(1H, s), 3.60(2H, t), 4.47(2H, t), 7.05-7.73(14H, m)34 H Py 2 1 ##STR40## -- (oil) 431 IR(nujol): 172535 H Py 2 1 ##STR41## -- (powder) 417 IR(nujol): 3350, 1708 NMR(DMSO-d.sub. 6): 2.36(4H, brs), 2.63(4H, brs), 2.76(2H, t), 4.23 (2H, t), 4.40(1H, s), 6.97-7.77 (12H, m), 8.30-8.44(1H, m)36 Cl Ph 3 1 COOCH.sub.2 CH.sub.3 -- 400 IR(neat): 1730 (Oil) NMR(DMSO-d.sub.6): 1.16(3H, t), 1.61- 1.69(2H, m), 2.08-2.50(10H, m), 3.31(2H, brs), 4.01(2H, q), 4.29(1H, s), 7.15-7.43(9H, m)37 Cl Ph 3 1 COOH Decomposition 372 IR(neat): 3400, 1710 point 183-185 NMR(DMSO-d.sub.6): 1.57-1.68(2H, m), 2.21(2H, t), 2.30-2.43(8H, m), 2.40(2H, brs), 4.30(1H, s) 7.15-7.44(9H, m)__________________________________________________________________________ TABLE 8__________________________________________________________________________Ex. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________38 H Ph 2 2 ##STR42## 63-64 444 IR(nujol): 3100, 1705, 1601 NMR(CDCl.sub.3): 1.74-1.80(2H, m), 2.65(4H, dt), 2.82(2H, t), 2.92(2H, t), 3.30(2H, t), 3.82(3H, s), 4.14(2H, t) 4.59(1H, s), 6.94-7.79(14H, m)39 H Ph 2 2 ##STR43## -- (foam) (Dihydrochloride) 429 IR(neat): 3005, 1713, 1558 NMR(CDCl.sub.3): 1.89-1.93(2H, m), 2.65(2H, t), 2.76(2H, t), 2.94(2H, t), 3.07(4H, dt), 4.37(2H, t), 4.57(1H, s), 5.33(1H, brs), 6.99-7.92(14H, m)__________________________________________________________________________

EXAMPLE 40

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoylimidazol ##STR44##

In dimethylformamide, 1.5 g (3.3 mmol) of 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoic acid, which had been obtained in Example 4, were dissolved. Under ice cooling, 1.35 g (8.3 mmol) of carbodiimidazole were added to the resulting solution, followed by stirring at 80.degree. C. for 20 minutes. After the reaction mixture was allowed to cool down, water was added and the resulting mixture was then extracted with ethyl ether. The ethyl ether layer was dried over anhydrous magnesium sulfate. The solvent was thereafter distilled off under reduced pressure. The residue so obtained was purified by chromatography on a column (chloroform), whereby the title compound was obtained. Melting point: powder (oxalate)

MS (m/z): 500(M.sup.+) IR (nujol) cm.sup.-1 : 1705 NMR (DMSO-d.sub.6) .delta.: (oxalate) 2.38(2H,brs), 2.85(2H,brs), 3.12(2H,brs), 3.31(2H,brs), 3.40(2H,t), 4.34(2H,m), 4.48(1H,s), 6.95-7.68(13H,m), 7.97 (1H,s), 8.80(1H,s)

EXAMPLE 41

2- [2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl ]ethoxy ]-N-1H-tetrazol-5-yl-benzamide ##STR45##

In dimethylformamide, 1.5 g (3.3 mmol) of the 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]-ethoxy]benzoic acid, which had been obtained in Example 4, were dissolved. Under ice cooling, 1.35 g (8.3 mmol) of carbodiimidazole were added to the resulting solution, followed by stirring at 80.degree. C. for 20 minutes. The reaction mixture was allowed to cool down to room temperature. To the reaction mixture, 446 mg (4.3 mmol) of 5-amino-1H-tetrazole-H.sub.2 O were added, followed by stirring at 100.degree. C. for one hour. The reaction mixture was poured into ice water to precipitate crystals. The crystals thus precipitated were collected by filtration and then purified by thin-layer chromatography, whereby 700 mg of the title compound were obtained. Yield: 39%

(Sodium salt)

Melting point (decomposition point): 178.degree. C.

______________________________________Elemental analysis (1.2.H.sub.2 O) C H N______________________________________Calculated: 57.74 5.28 17.45Found: 57.90 5.14 17.10______________________________________ IR (nujol) cm.sup.-1 : 3300, 1660 NMR (DMSO-d6) .delta.: 2.06(4H,brs), 2.44(4H,brs), 2.74(2H,t), 4.05(1H,s), 4.29(2H,t), 7.05-7.93(14H,m)

(Hydrochloride)

Melting point (decomposition point): 197.degree.-200.degree. C. MS (m/z): 517(M.sup.+) IR (nujol) cm.sup.-1 : 3400, 1680

EXAMPLE 42-59

In accordance with the procedures of Example 41, the compounds of Examples 42-59 shown in Tables 9-12 were obtained. The names of the compounds will be described below.

EXAMPLE 42

3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzamide

EXAMPLE 43

[3-[4-(Diphenylmethyl)-1-piperazinyl]N-propionyl]-N-1H-tetrazol-5-yl-anthranilamide

EXAMPLE 44

2-[[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]thio]-N-1H-tetrazol-5-yl-benzamide

EXAMPLE 45

2-[3-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-benzamide

EXAMPLE 46

2-[3-[4-(Diphenylmethyl)-1-piperazinyl]propoxy]-N-1H-tetrazol-5-yl-benzamid

EXAMPLE 47

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-naphthoamide

EXAMPLE 48

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-naphthoamide

EXAMPLE 49

2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-N-1H-tetrazol-5-yl-anthranilamide

EXAMPLE 50

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-acetamide

EXAMPLE 51

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-N-1H-tetrazol-5-yl-3-indoleamide

EXAMPLE 52

1-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]-N-1H-tetrazol-5-yl-2-indoleamide

EXAMPLE 53

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-phenylacetamide

EXAMPLE 54

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-nicotinamide

EXAMPLE 55

2-[2-[4-[(2-Phenyl-pyridylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzoic acid amide

EXAMPLE 56

2-[2-[4-(Diphenylmethyl)-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzamide

EXAMPLE 57

2-[2-[4-[2-(4-Chlorophenyl)pyridylmethyl]-1-piperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzoic acid amide

EXAMPLE 58

2-[4-[(4-Chlorophenyl)phenylmethyl]-1-homopiperazinyl]ethoxy]-N-1H-tetrazol-5-yl-benzamide

EXAMPLE 59

2-[2-[4-(Diphenylmethyl)-1-homopiperazinyl]-ethoxy]-N-1H-tetrazol-5-yl-benzamide TABLE 9__________________________________________________________________________EX. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1),__________________________________________________________________________ NMR(ppm)42 Cl Ph 2 1 ##STR46## Decomposition point 178 518 IR(nujol):3175, 1640 NMR(DMSO-d.sub.6):2.32(4H , brs), 2.56 (2H, brs), 2.75(2H, t), 3.45(2H, brs), 4.14(2H, t), 4.31(1H, s), 7.16-7.46(12H, m), 7.63(2H, brs)43 H Ph 2 1 ##STR47## -- (powder) NMR(DMSO-d.sub.6):2.22(2H, brs), 2.35 (2H, brs), 2.76(2H, t), 3.18(2H, brs), 4.23(2H, t), 4.33(1H, t), 6.88(1H, s), 7.16-7.44(14H, m), 7.61(1H, s), 9.65(1H, s)44 Cl Ph 2 1 ##STR48## 190-193 (Dihydrochloride) 533 IR(nujol):3200, 1690 NMR(DMSO-d.sub.6):(2HCl)2 .89(4H, brs), 3.17(1H, s), 3.26(2H, t), 3.38(2H, t), 3.90(4H, brs), 4.84(1H, s), 7.27-7.76(13H, m), 11.89(1H, s)45 Cl Ph 3 1 ##STR49## -- (Powder) IR(nujol):3350, 1650 NMR(DMSO-d.sub.6):1.96(2H , brs), 2.29 (2H, brs), 2.40-2.60(4H, m), 3.48 (6H, brs), 4.19(2H, t), 4.29(1H, s), 7.07-7.52(12H, m), 7.80(1H, brs)46 H Ph 3 1 ##STR50## 194-199 (Dihydrochloride) 497 IR(nujol):2450, 1680 NMR(DMSO-d.sub.6);(2HCl)2 .20(2H, t), 3.32(3H, brs), 3.63(8H, brd), 4.21(2H, t), 7.08-7.75(15H, m), 11.88(1H, s)__________________________________________________________________________ TABLE 10__________________________________________________________________________Ex. R.sup.1 B m p A Melting point(.degree.C.) MS(M.sup.+) IR(cm.sup.-1),__________________________________________________________________________ NMR(ppm)47 Cl Ph 2 1 ##STR51## 567 IR(nujol): 3400, 1670, 1600 NMR(DMSO-d.sub.6): 2.25(4H, brs), 2.64(4H, brs), 2.86(2H, t), 4.26(1H, s), 4.36(12H, t), 7.18-8.09(17H, m)48 Cl Ph 2 1 ##STR52## Decomposition point 196-197 (Dihydrochlorid e) 567 IR(nujol): 2400, 1680, 1580 MR(DMSO-d.sub.6): (2HCl)2.83(4H, brs), 3.61(2H, t), 3.80(4H, brs), 4.43(2H, t), 4.65(1H, s), 7.35- 8.19(16H, m), 12.51(1H, brs)49 Cl Ph 2 1 ##STR53## Decomposition point 171 516 NMR(DMSO-d.sub.6): 2.33(4H, brs), 2.89(4H, brs), 3.27(2H, t), 3.88 (2H, t), 4.27(1H, s), 6.59-6.78(2H, m), 6.96(1H, s), 7.18-7.50(10H, m), 7.83-7.86(1H, m), 10.79(1H, s)50 Cl Ph 2 1 ##STR54## Decomposition point 168 (Dihydrochloride) 455 IR(nujol): 3400, 3170, 1700 NMR(DMSO-d.sub.6): (2HCl)2.09(2Hs), 3.10(4H, brs), 3.46(2H, t), 3.65 (4H, brs), 3.94(2H, brs), 4.30(2H, s), 7.34-7, 48(5H, m), 7.76(7H, brs)51 Cl Ph 2 1 ##STR55## Decomposition point 162 540 IR(nujol): 3200, 1670 NMR(DMSO-d.sub.6): 2.27(4H, brs), 2.73(2H, t), 3.50(4H, brs), 4.28 (1H, s), 4.35-4.47(2H, m), 7.15-8.56(15H, m), 11.88(1H, s)__________________________________________________________________________ TABLE 11__________________________________________________________________________Ex. R.sup.1 B m p A Melting point (.degree.C.) MS(M.sup.+) IR(cm.sup.-1),__________________________________________________________________________ NMR(ppm)52 Cl Ph 2 1 ##STR56## Decomposition point 163 540 IR(nujol):3400, 3200, 1650 NMR(DMSO-d.sub.6):2.16(4H, brs), NMR(DMSO-d.sub.6):2.16( 4H, brs), 2.41 (4H, brs), 2.56(2H, t), 4.07(1H, s), 4.67(2H, t), 6.97-7.68(16H, m)53 Cl Ph 2 1 ##STR57## 161 531 IR(nujol):3200, 1670, 1580 NMR(DMSO-d.sub.6):2.24(4H, brs), 2.67 (4H, brs), 3.55(2H, t), 3.70 (2H, s), 4.03(2H, t), 4.22(1H, s) 6.89-7.80(14H, m), 11.88(1H, brs)54 Cl Ph 2 1 ##STR58## 140-141 518 IR(nujol:3350, 1670, 1570 NMR(DMSO-d.sub.6):2.25(4H, brs), 2.58(4H, brs), 2.84(2H, t), 4.21(1H, s), 4.56(2H, t) 7.17-8.40(14H, m)55 H Py 2 1 ##STR59## -- (powder) 484 IR(nujol):3250, 3150 NMR(DMSO-d.sub.6):2.16(4H, brs), 2.78 (2H, t), 3.51(4H, brs), 4.22(1H, s) 4.31(2H, t), 6.56(1H, s), 7.07-7.92 (12H, m), 8.39(1H, m), 10.70(1H, brs)56 H Ph 2 1 ##STR60## Decomposition point 176 483 IR(nujol):3190, 1660, 1550 NMR(DMSO-d.sub.6):2.24(4H, brs), 2.58(4H, brs), 2.83(2H, t) 4.13(1H, s), 4.33(2H, t), 7.12-8.25(16H, m)__________________________________________________________________________ TABLE 12__________________________________________________________________________Ex. R.sup.1 B m p A Melting point (.degree.C.) MS(M.sup.+) IR(C.sup.-1),__________________________________________________________________________ NMR(ppm)57 Cl Py 2 1 ##STR61## -- (powder) 518 IR(nujol):3250, 1640 NMR(DMSO-d.sub.6):2.12(4H, brs), 2.76(2H, t), 3.42(4H, brs), 4.23(1H, s), 4.30 (2H, t), 6.55(1H, s), 7.09-7.88(9H, m), 8.40-8.42(1H, m), 10.70(1H, brs)58 Cl Ph 2 2 ##STR62## -- (powder) 531 IR(nujol):3350, 1670 NMR(DMSO-d.sub.6):1.66(2H, brs), 2.56(2H, t), 3.00(4H, brs), 3.10(4H, brs), 4.35(2H, t), 4.62(1H, s), 6.97-7.72(15H, m)59 H Ph 2 2 ##STR63## 99-100 497 NMR(CDCl.sub.3):1.78-1.93(2H, m), 2.58 (2H, t), 2.64(2H, t), 2.97(2H, t), 3.02(2H, t), 3.11(2H, t), 4.35 (2H, t), 4.58(1H, s), 5.96(1H, brs), 6.67-8.08(14H, m), 10.78(1H, brs)__________________________________________________________________________

EXAMPLE 60

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-3,4,5-trimethoxyphenyl-benzamide ##STR64##

In 30 ml of ethyl acetate, 676 mg (3.67 mmol) of 3,4,5-trimethoxyaniline were dissolved. An aqueous solution (20 ml), in which were dissolved 2.0 g (3.69 mmol) of 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzoic acid chloride.dihydrochloride and 1.24 g of sodium hydrogencarbonate, was added to the resulting solution under ice cooling, followed by stirring for 30 minutes under ice cooling. The ethyl acetate layer was collected, washed successively with 10% sodium hydroxide and water and then, dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. Crude crystals so obtained were recrystallized from a mixed solvent of chloroform and isopropyl ether, whereby 1.75 g of the title compound were obtained. Yield: 77%.

Melting point (decomposition point): 157.degree.-158.degree. C. MS (m/z): 615(M.sup.+) IR (nujol) cm.sup.-1 : 3320, 1655 NMR (DMSO-d6) .delta.:

2.16(4H,brs), 2.50(4H,brs), 2.78(2H,t),

3.66(3H,s), 3.73(6H,s), 4.09(1H,s), 4.25(2H,t),

7.03 (2H, s), 7.07-7.78(13H,m), 10.08(1H,s)

EXAMPLES 61-65

Following the procedures of Example 60, the compounds of Examples 61-65 shown in Table 13 were obtained. The followings are the names of the compounds:

EXAMPLE 61

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-(3,5-dimethyl-4-hydroxyphenyl)-benzamide

EXAMPLE 62

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-thiazolidyl-2-yl-benzamide

EXAMPLE 63

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-thiazol-2-yl-benzamide

EXAMPLE 64

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-N-1H-triazol-5-yl-benzamide

EXAMPLE 65

2-[2-[4-(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]benzamide TABLE 13__________________________________________________________________________Ex. R.sup.1 B m p A Melting point (.degree.C.) MS(M.sup.+) IR(cm.sup.-1),__________________________________________________________________________ NMR(ppm)61 Cl Ph 2 1 ##STR65## Decomposition point 198-200 569 NMR(DMSO-d.sub.6):2.15(10H, brs), 2.50(4H, brs), 2.77(2H, t), 4.03(1H, s), 4.26(2H, t), 7.05- 7.51(14H, m), 7.86-7.90(1H, m), 8.13(1H, brs), 9.95(1H, s)62 Cl Ph 2 1 ##STR66## -- (foam) 535 IR(nujol):3300, 167063 Cl Ph 2 1 ##STR67## 136-138 533 IR(nujol):3250, 1645 NMR(DMSO-d.sub.6):2.24(4H, brs), 2.51(4H, brs), 2.77(2H, t), 4.18 (1H, s), 4.33(2H, t), 7.07-7.59 (14H, m), 7.85-7.88(1H, m)64 Cl Ph 2 1 ##STR68## -- (powder) 517 IR(nujol):3300, 1660 NMR(DMSO-d.sub.6):2.17(4H, m), 2.50 (4H, m), 2.75(2H, t), 4.12(1H, s), 4.31(2H, t), 7.08-7.40(13H, m), 7.52- .59(1H, m), 7.85-7.89(1H, m)65 Cl Ph 2 1 ##STR69## 160-161 449 IR(nujol):3400, 1660 NMR(DMSO-d.sub.6):2.31(4H, brs), 2.49(4H, brs), 2.71(2H, t), 4.20(2H, t), 4.29(1H, s), 6.99- 7.88(13H, m), 8.20(2H,__________________________________________________________________________ brs)

EXAMPLE 66

2-[[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]amino]benzoic acid ##STR70##

In 1N sodium hydroxide, 800 mg (1.74 mmol) of the 1-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazyl]ethoxy]isatin, which had been obtained according to the procedures of Example 1, and 3 ml of tetrahydrofuran were dissolved, followed by the dropwise addition of 1 ml of a 30% aqueous hydrogen peroxide solution. After having been stirred at 70.degree. C. for one hour, the reaction mixture was allowed to cool down and an aqueous solution of sodium sulfite was added. Further, acetic acid was added to the resulting mixture to adjust its pH to 3. Crystals so precipitated were purified by chromatography on a silica gel column (ethyl acetate), whereby 405 mg of the title compound were obtained. Yield: 52%.

Melting point: 205.degree.-206.degree. C.

MS (m/z): 449(M.sup.+)

IR (nujol) cm.sup.-1 : 3320, 1655 NMR (DMSO-d.sub.6 ) .delta.: 2.32(4H,brs), 2.50(4H,brs), 2.58(2H,t), 3.21(2H,t), 4.27(1H,s), 6.52(1H,t), 6.79(1H,d), 7.18(1H,d), 7.26-7.46(11H,m), 7.76(1H,dd)

EXAMPLE 67

Sodium 2-[[2-[4-[(4-chlorophenyl)phenylmethyl ]-1-piperazinyl]ethyl]amino]-.alpha.-oxo-phenylacetate ##STR71##

In 5 ml of tetrahydrofuran, 300 mg of 1-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazyl]ethoxy]-isatin, which had been obtained in accordance with the procedures of Example 1, and 0.5 ml of a 1N aqueous sodium hydroxide solution were dissolved, followed by stirring at room temperature for 2 hours. The solvent was distilled off under reduced pressure. The residue was thereafter dissolved in water and purifed on polystyrene gel (HP-20), whereby the title compound was obtained.

Melting point (decomposition point): 130.degree.-133.degree. C. (sodium salt)

______________________________________Elemental analysis: C H N______________________________________Calculated: 64.86 5.44 8.40Found: 64.83 5.70 8.17______________________________________

EXAMPLE 68

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-(N-1H-tetrazol-5-yl)-benzene ##STR72##

In 50 ml of toluene, 4.7 g (10.9 mmol) of the 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]-ethoxy]benzonitrile, which had been obtained in Example 13, and 10.9 g (32.7 mmol) of tri-n-butyltin azide were dissolved, followed by refluxing for two days. To the reaction mixture, 5.6 g of benzonitrile were added, followed by further refluxing until the excess tri-n-butyltin azide was eliminated. After the reaction mixture was allowed to cool down, the solvent was distilled off under reduced pressure. The residue so obtained was dissolved in a mixed solution of hydrochloric acid, dioxane and ethanol, followed by stirring for one hour. After the solvent was distilled off, a mixed solution of toluene and ethyl ether was added, whereby 4.34 g of the title compound were obtained as a precipitate. Yield: 72%.

Melting point: powder (dihydrochloride) MS (m/z): 474(M.sup.+) IR (nujol) cm.sup.-1 : 3400 NMR (DMSO-d6) .delta.: 2.41(2H,m), 2.65(7H,m), 2.86-2.92(2H,m), 10 4.19(2H,t), 4.32(2H,t), 6.92-7.54(14H,m), 8.31-8.34 (1H,m)

EXAMPLES 69 & 70

Following the procedures of Example 68, the compounds of Examples 68 and 69 shown in Table 14 were obtained. The followings are the names of the compounds:

EXAMPLE 69

2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-1-tetrazol-5-ylmethyl

EXAMPLE 70

3-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]-[N-1H-tetrazol-5-yl]-benzene TABLE 14__________________________________________________________________________Ex. R.sup.1 B m p A Melting point (.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________69 Cl Ph 2 1 ##STR73## Decomposition point 225 (Dihydrochloride) 412 IR(nujol):3450 NMR(DMSO-d.sub.6):(2H Cl)2.60- 3.80(11H, m), 3.95(2H, t), .91(2H, s), 7.38-7.48 (5H, m), 7.77(4H, brs)70 Cl Ph 2 1 ##STR74## 220-222 (Dihydrochloride) 474 IR(nujol):3400 NMR(DMSO-d.sub.6):(2H Cl)3.14(4H, brs), 3.20-4.50(9H, m), 4.54(2H, brs), 5.33(1H, brs), 7.20-7.75(13H, m)__________________________________________________________________________

EXAMPLE 71

2-[[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]thio]benzoic acid ##STR75##

In a 15:85 mixed solution of water and tetrahydrofuran, 5.0 g (12 mmol) of 2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]-ethylchloride.dihydrochloride were dissolved, followed by the dropwise addition of 4.0 g (39 mmol) of triethylamine under an argon stream. To the resulting solution, 2.2 g (14 mmol) of thiosalicylic acid were added and they were stirred at 50.degree. C. for 8 hours. After the reaction mixture was allowed to cool down, the solvent was distilled off under reduced pressure. Water (200 ml) was added to the residue, followed by extraction with 200 ml of ethyl acetate. The ethyl acetate layer was dried over anhydrous magnesium sulfate and the solvent was distilled off. The residue so obtained was purified by chromatography on a silica gel column (chloroform: methanol =10:1), whereby 2.8 g of the title compound were obtained in an oily form. Yield: 51%.

Melting point: 181-184.degree. C. (hydrochloride) MS (m/z): 466(M.sup.+) IR (nujol) cm.sup.-1 : 2280, 1700, 1590 NMR (DMSO-d6) .delta.: (dihydrochloride) 3.09(4H,brs), 3.35(4H,brs), 3.41(2H,t), 3.60(3H,t), 3.64(1H,s), 7.24-7.93(14H,m)

EXAMPLES 72-74

In accordance with the procedures of Example 71, the compounds of Examples 72-74 shown in Table 15 were obtained. The followings are the names of the compounds.

EXAMPLE 72

Ethyl 2-[[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]thio]acetate

EXAMPLE 73

2-[[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]thio]acetic acid

EXAMPLE 74

2-[[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]thio]nicotinic acid TABLE 15__________________________________________________________________________Ex. R.sup.1 B m p A Melting point (.degree.C.) MS(M.sup.+) IR(cm.sup.-1), NMR(ppm)__________________________________________________________________________72 Cl Ph 2 1 SCH.sub.2 COOCH.sub.2 CH.sub.3 -- 432 NMR(DMSO-d.sub.6):(oxalate)1.21(3H, (powder) t), 2.98-3.04(2H, m), 3.26(4H, (Oxalate) brs), 3.37-3.42(2H, m), 3.50 (2H, s), 3.65(5H, brs), 4.12(2H, q), 7.35-7.51(4H, m), 7.87(5H, t)73 Cl Ph 2 1 SCH.sub.2 COOH Decomposition 404 IR(nujol):3450, 1720 point 170-172 NMR(DMSO-d.sub.6):(oxalate)2.50 (Oxalate) (4H, m), 2.86-2.91(2H, m), 3.20- 3.26(6H, m), 3.36(2H, s), 4.50 (1H, s), 7.23-7.48(9H, m)74 Cl Ph 2 1 ##STR76## 185 (Dihydrochloride) 467 IR(nujol):3400, 1720, 1560 NMR(DMSO-d.sub.6):(2HCl)2.93 (4H, brs), 3.39(4H, brs), 3.60 (2H, t), 4.62(3H, brs), 7.25-8.70(13H,__________________________________________________________________________ m)

EXAMPLE 75

Methyl 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]thio]benzoate ##STR77##

In 20 ml of anhydrous dichloromethane, 1.1 g (2.36 mmol) of the 2-[[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethyl]thio]benzoic acid, which had been obtained in Example 71, were suspended, followed by the dropwise addition of 0.4 g (3.53 mmol) of thionyl chloride and stirring for 30 minutes, both under ice cooling. After the solvent was distilled off under reduced pressure, 20 ml of anhydrous methanol were added to the residue and the resulting mixture was stirred at room temperature for 30 minutes. The solvent was distilled off under reduced pressure. Water (50 ml) was added to the residue, followed by extraction with 50 ml of ethyl acetate. The ethyl acetate layer was washed with a saturated aqueous solution of sodium hydrogencarbonate and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue so obtained was purified by chromatography on a silica gel column (ethyl acetate:n-hexane =2:1), whereby 0.94 g of the title compound was obtained in an oily form. Yield: 85%.

Melting point: 170.degree.-171.degree. C. (hydrochloride) MS (m/z): 480(M.sup.+) IR (nujol) cm.sup.-1 : 2300, 1710, 1590 NMR (DMSO-d.sub.6) .delta.: (dihydrochloride) 2.38(4H,brs), 2.80(4H,brs), 3.17 (2H,t), 3.45(2H,t), 3.83(3H,s), 4.53(1H,s), 7.20-7.92(13H,m)

EXAMPLE 76

Methyl [3-[4-(diphenylmethyl)-1-piperazinyl]N-propionyl]anthranilate ##STR78##

In 100 ml of toluene, 5.92 g (23.5 mmol) of diphenylmethylpiperazine, 5.67 g (23.5 mmol) of methyl N-3-chloropropionylanthranilate and 6.23 g (43.9 mmol) of sodium carbonate were suspended, followed by refluxing for 12 hours. The reaction mixture was allowed to cool down and water was added to it, followed by extraction with ethyl acetate. The ethyl acetate layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue so obtained was purified by chromatography on a silica gel column (n-hexane: ethyl acetate =1:2), whereby 9.2 g of the title compound were obtained. Yield: 86%.

Melting point: 120.degree.-122.degree. C. MS (m/z): 457(M.sup.+) IR (nujol) cm.sup.-1 : 3280, 1710, 1690 NMR (DMSO-d6) .delta.: 2.31(4H,brs), 2.48(4H,brs), 2.50(2H,t), 3.80(3H,s), 4.24(1H,s), 7.13-8.27(14H,m)

______________________________________Preparation Example 1______________________________________Compound of Example 41 50 gLactose 315 gCorn starch 125 gCrystalline cellulose 25 g______________________________________

The above ingredients were mixed uniformly, followed by the addition of 200 ml of a 7.5% aqueous solution of hydroxypropylcellulose. The resultant mixture was granulated through a screen of 0.5 mm in diameter by an extrusion granulator. Immediately after that, the resultant granules were rounded by a Marumerizer and then dried, whereby granules were obtained.

The dried granules so obtained were coated with 1.9 kg of a film coating solution of the below-described composition by using a fluidized-bed granulator, whereby enteric coated granules were obtained.

______________________________________Composition of the coating solution:Hydroxypropylmethylcellulose phthalate 5.0 wt. %Stearic acid 0.25 wt. %Methylene chloride 50.0 wt. %Ethanol 44.75 wt. %Preparation Example 2Compound of Example 45 20 gLactose 100 gCorn starch 36 gCrystalline cellulose 30 gCarboxymethylcelullose calcium 10 gMagnesium stearate 4 g______________________________________

The above ingredients were mixed uniformly and then, pressed into 200-mg tablets by a punch of 7.5 mm in diameter on a single punch tableting machine.

A coating solution of the below composition was sprayed to the tablets to apply 10 mg of a coating per tablet, whereby enteric film-coated tablets were obtained.

______________________________________Composition of the coating solution:Hydroxypropylmethylcellulose phthalate 8.0 wt. %Glycerin fatty acid ester 0.4 wt. %Methylene chloride 50.0 wt. %White beeswax 0.1 wt. %Isopropanol 41.5 wt. %Preparation Example 3Compound of Example 46 100 mgSodium acetate 2 mgAcetic acid q.s.(for adjustment of pH to 5.8)Distilled water for injection q.s.Total 10 ml/vial______________________________________

An injection was obtained according to the above formulation in a manner known per se in the art.

______________________________________Preparation Example 4______________________________________Compound of Example 69 0.1 wt. %Ethanol 20.0 wt. %Liquefied gas ("Propellant 114") 49.2 wt. %Liquefied gas ("Propellant 12") 30.7 wt. %______________________________________

An aerosol was prepared according to the above formulation in a manner known per se in the art.

Tests

Test 1 Antihistamic effects

From a Hartley male guinea pig (300-600 g in weight), the ileum was isolated. The ileum was attached to a holder under a vesting tension of 0.5 g in a Magnus bath (30.degree. C., under aeration) filled with 10 ml of the Tyrode solution. As a contraction reaction of the isolated ileum caused by histamine (3.times.10.sup.-7 mole), an isometrical change in muscular tension was measured. The ileum was treated with the test compound for 3 minutes before the addition of histamine to study its effects and then its antihistamic action (50% inhibition concentration: IC.sub.50 value) was determined.

As a result, each compound showed an IC.sub.50 value of from 0.14 to 1.59 .mu.M. Incidentally, the IC.sub.50 value of Cetirizine (the compound disclosed in Japanese Patent Laid-Open No. 149282/1982) was determined as a control. Its IC value was 2.40 .mu.M.

Test 2 Antiallergic effects

The back of a male SD rat (150-250 g in weight) was shaved in advance. Physiological saline and 0.1 ml of anti DNP-AS (Dinitrophenyl conjugated Ascaris) IgE serum which had been diluted to a suitable concentration with physiological saline were intradermally injected there. Fourty-eight hours after sensitization, the animals were challenged with 1 ml of 0.5% Evans blue physiological saline containing 2.5 mg/ml of DNP-BSA (dinitrophenyl conjugated bovine serum albumin) via the tail vein. Thirty minutes later, they were sacrificed under exsanguination and the dorsal skin was removed and the exuded dye was measured according to the method proposed by Harada et al. [Allergy, 15, 1-7(1966)]. The leaked color amount caused by the passive cutaneous anaphylaxis (PCA) was determined by subtracting the leaked color amount of the site to which physiological saline was administered from that of the PCA site. Each test compound was suspended in 5% gum arabic or 0.5% methylcellulose and the-resulting suspension was orally administered at the rate of 10 mg/4 ml/kg one hour before the administration of antigen. The efficacy of the test compound was evaluated by an ihibition rate (antiallergic effects) of the leaked color amount. The results are shown in Table 16.

TABLE 16______________________________________Test compound Antiallergic effects (%)______________________________________Compound of Example 5 86.4(1/2 fumarate)Compound of Example 9 61.9Compound of Example 41 52.3(Sodium salt)Compound of Example 44 54.7Compound of Example 45 72.4Compound of Example 46 59.8Compound of Example 50 60.4Compound of Example 69 81.0______________________________________ Test 3 Toxicity Test

Ten 4-5 week old ICR mice (Charles River Co., Ltd.) were employed in groups, each consisting of 10 mice. The compounds of the Examples were separately suspended in 5% gum arabic. The suspension were each orally administered at a dose of 1000 mg/kg and the mice were observed for 7 days. As a result, no case of death caused by the toxicity of any of the invention compounds was observed.

Industrial Applicability

The compounds according to the present invention have strong antihistamic and antiallergic effects and have a high degree of safety so that they are useful as therapeutic agents for various allergic diseases, for example, as anti-inflammatory agents, therapeutics for nephritis, hepatitis or pancreatitis, preventives and/or therapeutics for respiratory diseases, and anti-asthmatic drugs.

Claims

1. A compound of formula (1): ##STR79## or a pharmaceutically acceptable salt thereof.

2. A pharmaceutical composition comprising an effective amount of a compound of formula (1) as claimed in claim 1 or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable auxiliary agent.

3. A method for treatment of allergic diseases, which method comprises administering an effective amount of a compound of formula (1): ##STR80## or a pharmaceutically acceptable salt thereof to a patient suffering from allergic disease.

4. A method as claimed in claim 3 wherein said allergic disease is bronchial asthma.