A therapeutic agent for pollakiuria, urinary urgency or incontinence of urine comprising alpha-phenyl-alpha-pyridylalkanoic acid derivatives

Abstract: A pharmaceutical composition as a therapeutic agent for dysuria comprising a compound of the formula : wherein R¹, R² and R³ are each lower alkyl, or its salt, as an active ingredient in association with a pharmaceutically acceptable, substantially nontoxic carrier or excipient.

Description: This invention relates to a therapeutic agent for pollakiuria, urinary urgency or incontinence of urine comprising α-phenyl-α-pyridylalkanoic acid derivatives or their salts. Accordingly, the object of this invention is to provide a therapeutic agent for pollakiuria, urinary urgency or incontinence of urine comprising α-phenyl-α-pyridylalkanoic acid derivatives of the following formula [I] or their salts : wherein R¹, R² and R³ are each C₁-C₆ alkyl. It is known as described in European Patent Application publication No. 105458 that the compound [I] of this invention has antiulcer activity and antispasmodic activity. Therefore, the compound is expected to be useful for the management of spasm, pain and/or hyperanakinesia in gastric ulcer, duodenal ulcer, hyperacidity, esophagospasm, gastritis, enteritis, irritable bowel syndrome, intestinal colic, cholecystitis, cholangitis, pylorospasm, pancreatitis, biliary dyskinesia, sequelae of cholecystectomy, urolithiasis, dysmenorrhea, hyperhidrosis or urinary tract spasm. However, it is not known that this compound is effective in the treatment of pollakiuria, urinary urgency or incontinence of urine. Am. J. Surg., 145 (5), 1983, 558-561 describes disopyramide as an anticholinergic drug having clinical atropine-like effects on the detrusor, which may lead to urinary retention. Clin. Obstet. Gynaecol., 8 (1), 1981, 149-160 discloses that atropine-like substances will relax the bladder, tending to cause retention of urine. An overactive reflex with urgency and frequency can be decreased with atropine-like drugs. Also Arch. Intern. Med., 143 , 1983, 1683-1686 discloses disopyramide-induced urinary retention. Particulars of the various definitions mentioned in this specification and preferred examples thereof are explained in the following. Suitable "C₁-C₆ alkyl" may be straight or branched one such as methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl or hexyl, preferably C₁-C₄ alkyl, in which the most preferable one is methyl. Suitable salts of the compound [I] are conventional non-toxic pharmaceutically acceptable salts and may include an organic or inorganic acid addition salt [e.g. formate, acetate, fumarate, citrate, trifluoroacetate, maleate, tartrate, methanesulfonate, benzenesulfonate, toluenesulfonate, hydrochloride, hydrobromide, sulfate, phosphate, etc.]. It is to be noted that each of the compound [I] may include one or more stereoisomers due to asymmetric carbon atom(s), and all of such isomers and a mixture thereof are included within the scope of this invention. In order to show the usefulness of the compound [I] or their salts used as an ingredient of the therapeutic agent for pollakiuria, urinary urgency or incontinence of urine, the results of pharmacological tests are shown in the following. Test Compound (±)-(2R*,4R*)-4-Dimethylamino-2-phenyl-2-(2-pyridil)-valeramide Test 1 Inhibition of urinary bladder contraction in the pressure-loaded hyperactive bladder model in rats [I] Method Male S.D. rats weighing 240-450 g were anesthetized with urethane (1.0 g/kg) s.c.. The urinary bladder was then exposed through a midline incision in the abdomen and the intravesical pressure was recorded. Thus, a balloon attached to one end of a stainless steel tube (1.2 mm in outer diameter, 5 cm in length) was inserted into the bladder through a small incision made in the bladder dome, while the other end of the tube was connected to a pressure transducer. The ureter was ligated and cut and a polyethylene cannula was inserted from the proximal cut end to drain off the urine. Hyperactive bladder (detrusor hyperreflexia) was induced by water filling of the bladder. A hydrostatic pressure of about 10 mmHg was applied to the balloon in the bladder. When the contractile response of the bladder to water pressure loading became steady, the test compound was administered intravenously. [II] Result ED₃₀ = 0.09 mg/kg Test 2 Effect on voiding reflex bladder contraction in rats with the ureter ligated [I] Method A midline incision was made in the abdomen of male S.D. rats (body weight 250-350 g) under urethane (1.0 g/kg i.p.) anesthesia. A small incision was made in the bladder dome and one end of a polyethylene tube was inserted and, then, ligated. To the other end of the polyethylene tube was attached a three-way cock. An infusion pump was connected to one of the joints and a transducer was connected to another joint for measurement of the intravesical pressure. Physiological saline was then infused continuously into the bladder. After confirmation of steady voiding reflexes, the ureter was ligated immediately before the next voiding and the infusion of physiological saline was stopped. After the resulting rhythmic contractions became stable, the test compound was administered into the jugular vein to evaluate its effect. [II] Result ED₅₀ = 0.56 mg/kg Test 3 Anticholinergic effect in the isolated quinea pig bladder [I] Method Male guinea pigs weighing 400-700 g were fainted and killed by a blow on the occipital region. A bladder detrusor muscle specimen (15-20 mm long x 5 mm thick) was prepared by longitudinal section and suspended in a Magnus bath containing Krebs solution which was aerated with 95% 0₂ - 5% CO₂. Isotonic contractions were recorded through a tension transducer. The buffer solution was changed five times at 15-minute intervals. The equilibration time was 10 minutes. Contractions were induced with 10 µM carbamylcholine, and after the contractions became steady, the test compound was added to the Magnus bath and its anticholinergic effect was investigated. [II] Result IC₅₀ = 6.0 x 10⁻⁷ g/ml Test 4 Acute toxicity test [I] Method Five rats (Crj:CD(SD) strain) of either sex were used per group. Solutions of the test compound were prepared as shown below and administered to rats intravenously or subcutaneously. The rats were then observed for 14 days. The LD₅₀ values were calculated by the probit method. (Preparation of test solutions) The test compound was dissolved in hydrochloric acid and the solution was adjusted to pH 6-7 with sodium hydrogen carbonate and diluted with physiological saline to the required concentrations. [II] Results It is clear from the above results that the compound [I] has anticholinergic activity and exhibits an inhibitory effect on bladder contraction. This means that the compound is a useful therapeutic agent for pollakiuria, urinary urgency or incontinence of urine in cases of nervous pollakiuria, neurogenic bladder, nocturia, unstable bladder, cystospasm, chronic cystitis or chronic prostatitis. Since the compound of the invention, thus, has anticholinergic activity, it is expected to be also useful for the treatment of asthma or angina pectoris. The therapeutic agent for pollakiuria, urinary urgency or incontinence of urine used in the present invention can be administered orally, parenterally or externally (topically) to a mammal including human being in a conventional pharmaceutical form such as capsules, micro-capsules, tablets, granules, powders, troches, pills, ointments, suppositories, injection solutions, suspensions or syrups. The therapeutic agent for pollakiuria, urinary urgency or incontinence of urine of the present invention can be produced by the established procedures using various organic or inorganic carriers, which are conventional for pharmaceutical purpose, such as excipient [e.g. sucrose, starch, mannit, sorbit, lactose, glucose, cellulose, talc, calcium phosphate, calcium carbonate, etc.], binding agent [e.g. cellulose, methyl cellulose, hydroxymethyl cellulose, polypropylpyrolidone, gelatin, gum arabic, polyethylene glycol, sucrose, starch, etc.], disintegrator [e.g. starch, carboxymethyl cellulose, hydroxypropyl starch, sodium bicarbonate, calcium phosphate, calcium citrate, etc.], lubricant [e.g. magnesium stearate, aerosil, talc, sodium laurylsulfate, etc.], flavoring agent [e.g. citric acid, menthol, glycine, organge powders, etc.], preservative [e.g. sodium benzoate, sodium bisulfite, methylparaben, propylparaben, etc.], stabilizer [e.g. citric acid, sodium citrate, acetic acid, etc.], suspending agent [e.g. methyl cellulose, polyvinylpyrrolidone, aluminum stearate, etc.], dispersing agent [e.g. hydroxypropylmethyl cellulose, etc.], diluting agent [e.g. water, etc.], base wax [e.g. cacao butter, white petrolatum, polyethylene glycol, etc.]. The amount of the active ingredient in such a pharmaceutical preparation may be no more than the amount necessary to produce the desired therapeutic effect. By way of illustration, it can be about 0.2 mg to about 500 mg per unit dose for oral or parenteral administration. The active ingredient can be administered in a unit dose of 0.1 mg/patient to 500 mg/patient once to 4 times a day. It should be understood that the above dosage may be adjusted according to the patient's age and body weight, the severity of condition and the route and method of administration. The following Preparation and Examples are given for the purpose of illustrating this invention in more detail. Preparation (1) A mixture of 4-dimethylamino-2-phenyl-2-(2-pyridyl)-valeronitrile (50.0 g), water (2.74 g) and sulfuric acid (50 ml) was reacted at 100-105°C for 2 hours. The reaction mixture was then cooled, diluted with cold water (100 ml) and poured into a mixture of methylene chloride (400 ml) and water (500 ml). The aqueous layer was adjusted to pH 12.5 with 24% aqueous sodium hydroxide solution. The organic layer was taken, washed with saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. To this were added isopropyl alcohol (75 ml), acetone (175 ml) and concentrated hydrochloric acid (10.87 g) and the mixture was stirred for 10 minutes. Then, seed crystals (0.05 g) were added and the mixture was further stirred at 25-30°C for 1 hour and, then, at -5 to -10°C for another 1 hour. The resulting crystals were recovered by filtration, washed with methylene chloride and dried to give (±)-(2R*,4R*)-4-dimethylamino-2-phenyl-2-(2-pyridyl)valeramide hydrochloride (26.9 g). (2) To a solution of (±)-(2R*,4R*)-4-dimethylamino-2- phenyl-2-(2-pyridyl)valeramide hydrochloride (20 g) in water (80 ml) were added seed crystals (0.02 g) and a solution of sodium hydroxide (2.47 g) in water (80 ml) was dropwise added thereto at 20-25°C over a period of 30 minutes. The mixture was stirred at the same temperature for 1 hour. The resulting crystals were recovered by filtration, washed with water and dried to give (±)-(2R*,4R*)-4-dimethylamino-2-phenyl-2-(2-pyridyl)-valeramide (16.1 g). mp : 156-157°C Example 1 (±)-(2R*,4R*)-4-Dimethylamino-2-phenyl-2-(2-pyridil)-valeramide (120 g), lactose (1080 g) and low-substituted hydroxypropylcellulose (110 g) were blended together. To this blend was added a solution of hydroxypropylcellulose L (23 g) in water (2.4 kg) dropwise. After compounding, the mixture was dried and sieved through a 20-mesh screen for size selection. To the resulting granulation was added magnesium stearate (11 g), followed by mixing. The granules thus obtained were compressed into tablets (135 mg/tablet). Example 2 Instead of being compression-molded, the granules obtained in Example 1 were encapsulated to provide capsules (80 mg/capsule).

Claims: Use of a compound of the formula : wherein R¹, R² and R³ are each C₁-C₆ alkyl, or its salt for the manufacture of a medicament for therapeutic treatment of pollakiuria, urinary urgency or incontinence of urine in human beings or animals. Use according to claim 1 of (±)-(2R*,4R*)-4-dimethylamino-2-phenyl-2-(2-pyridyl)valeramide.

Inventors: TOMOI MASAAKI, TOMOI, MASAAKI
Applicants: FUJISAWA PHARMACEUTICAL CO, FUJISAWA PHARMACEUTICAL CO., LTD.
Application year: 1991
Main classification: A61K31
IPC codes: C07D213, A61K31, A61P15, A61P13