Pyrimidone compound and pharmaceutically acceptable salts thereof

Abstract: A pyrimidone compound or a pharmaceutically acceptable salt thereof such as a 5,6-di-substituted-2-[4-<3-(1-­ piperdinomethyl)-phenoxy>-cis-2-butenylamino] -4-(1H)-­ pyrimidone or a 5,6-di-substituted-2-[4-<-4-(1-­ piperidinomethyl)-pyridyl-2-oxy>-cis-2-butenylamino] -4-(1H)-­ pyrimidone or a pharmaceutically acceptable salt thereof is herein disclosed. Such a compound or a salt thereof simultaneously shows gastric acid secretion inhibiting effect and gastric mucous membrane protecting effect and is useful as medicine for treating gastric diseases such as medicine for inhibiting gastric acid secretion or that for treating digestive ulcers.

Description: The present invention relates to a novel pyrimidone compound and more specifically to a useful and novel pyrimidone compound and pharmaceutically acceptable salt thereof exhibiting excellent gastric acid secretion inhibitory effect and cytoprotective effect. Up to now, there have been known some pharmaceutically useful compounds which have excellent antagonistic effect in respect of H₂ receptor and gastric acid secretion inhibitory effect. For instance, Cimetidine, Ranitidine, Famotidine and Roxatidine are commercially available and many other compounds are disclosed in, for instance, JP-A-60-255756; JP-A-61-85365; JP-A-61-207375 and JP-A-60-228465. One of the principal effects of these compounds is the acid secretion inhibitory effect due to an antagonistic effect in respect of histamine H₂ receptors and they show a remarkable curative effect of gastric ulcers. However, if the medication is stopped after healing, such gastric ulcer recurs because of so-called rebound phenomenon, which becomes an important clinical problem. In order to prevent such gastric ulcer from recurring, an agent having acid secretion inhibitory effect such as an antagonist in respect of histamine H₂ receptor and a drug having a defence effect for the mucous membrane of alimentary canals have been simultaneously administered or after stopping the treatment with an antiulcer, the treatment is continued with a drug having defence effect. However, the use of only an attack factor inhibiting agent such as an acid secretion inhibitor is insufficient from the clinical point of view. Accordingly, a principal object of the present invention is to provide novel pyrimidone derivatives and pharmaceutically acceptable salts thereof. It is another object of the present invention to provide such a derivative or a salt thereof simultaneously having a gastric acid secretion inhibiting effect and a gastric mucous membrane protecting effect. It is a further object of the present invention to provide such a derivative or a salt thereof which is useful as a drug for treating gastric diseases such as a drug for inhibiting gastric acid secretion or that for treating digestive ulcers and which shows only minor side effects. The foregoing objects of the present invention can effectively be attained by providing a novel pyrimidone compound represented by the following formula (I) and pharmaceutically acceptable salts thereof: In the formula (I), R¹ and R² each represents a linear or branched alkyl group having 1 to 12 carbon atoms or a group represented by the formula: (wherein n is an integer of 1 to 3 and R³ and R⁴ each represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms or R³ and R⁴ together form a methylenedioxy group); and A represents a group having the formula: (wherein m and p each represents an integer of 1 to 3; and R⁵ to R⁸ each represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, or -NR⁵R⁶ and -NR⁷R⁸ each represents a group (wherein q is an integer of 4 to 6)). The present invention will hereunder be explained in more detail. Examples of an alkyl group having 1 to 12 carbon atoms shown as R¹ and R² in the formula (I) include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, hexyl, heptyl, octyl, decyl and dodecyl groups. Moreover, examples of an alkyl group having 1 to 6 carbon atoms shown as R³, R⁴, R⁵, R⁶, R⁷ and R⁸ include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl and isopentyl groups. In addition, the position of the substituent: -(CH₂) m -NR⁵R⁶ in the formula: is preferably m- or p-position; and the group -(CH₂)p-NR⁷R⁸ in the formula: is preferably present at 4- or 6-position. The compounds of the present invention represented by the formula (I) may be acid-addition salts and examples of acids which form salts with the compounds include inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and methanesulfonic acid; and organic acids such as maleic acid, fumaric acid, oxalic acid, formic acid and acetic acid. The novel compounds of the present invention represented by the formula (I)are prepared according to the following reaction scheme: wherein R¹, R² and A are the same as those defined above, and Z represents a nitroamino group, a lower alkylthio group or a lower alkoxy group. Compounds (I) of the present invention can be prepared by reacting a compound represented by the formula (III), i.e., a 4-(substituted aryloxy)-2-butenyl-amine derivative with a 2-nitroamino-, 2-lower alkylthio- or 2-lower alkoxypyrimidone derivative represented by the formula (II). Compounds (II) and (III) used as the starting materials are known. In other words, 2-nitroamino-4-(1H)-pyrimidone is prepared according to the method disclosed in JP-A-60-228465, 2-methylthio-4-(1H)-pyrimidone is prepared according to the method disclosed in Yakugaku Zasshi, 1976, Vol. 96, No.3, p. 384, and 2-methoxy-4-(1H)-pyrimidone is prepared according to the method disclosed in Tetrahedron, 1984, Vol. 40, No. 17, p. 3313. On the other hand, starting material (III) includes cis- and trans- forms as the geometrical isomers and can be prepared according to the methods disclosed in JP-A-57-165348; JP-A-61-85365; and JP-A-61-207375. The reaction of compounds (II) and (III) can be performed without using a solvent, but it is desirable to use an inert organic solvent to control the reaction temperature. As such organic solvents, there may be used pyridine, picoline, quinoline, ethanol, toluene and xylene. The reaction is preferably carried out while stirring under heating, preferably refluxing condition. It is desirable to control the reaction temperature to 50 to 200°C, preferably 80 to 150°C. Moreover, the reaction time ranges from 30 minutes to 50 hours, preferably 5 to 48 hours. In general, Compound (II) is reacted with an equimolar amount of Compound (III) and in particular it is preferred to use Compound (II) in a slightly excess amount. Alternatively, the compounds of the present invention can also be prepared by the following reactions: In the foregoing reaction schemes, X represents a halogen atom such as a chlorine, bromine or iodine atom; M is an alkali metal such as sodium or potassium; and m, R¹, R², R⁵, R⁶ and A are the same as those defined above. The pharmacological effects of the compounds of the present invention will be detailed below. For this purpose, a variety of tests were carried out to compare some of the compounds of this invention with Cimetidine which has widely been employed clinically as a digestive antiulcer having an antagonistic effect for histamine H₂ receptor. (A) Inhibitory Effect on Gastric Acid Secretion by Histamine in the Pylorus Ligated Rat This test was carried out by an improved method of that reported by Watanabe et al., (OYO YAKURI (Applied Pharmacology), 1969, Vol. 3-1, pp. 7 - 14). A male Wister rat having a body weight of about 160 g and which was not fed for 24 hours was anesthetized by an intraperitoneal dose of 1.2 g/kg of urethane. After ligating of pylorus and esophagus, gaster anterior was incised and fitted with a double polyethylene wall cannula. The wall of the stomach was rinsed with saline (5 ml each) at 30 minutes intervals, and the amount of gastric acid present in the rinsing solution were determined by titration technique. The basal amount of secreted gastric acid was initially measured three times, then 2 mg/kg of each of the compounds of the invention was administered subcutaneously and 3 mg/kg of histamine was subcutaneously administered after the lapse of an additional 30 minutes. The quantity of gastric acid secreted after the operation was measured continuously for 3 hours. Within that measurement interval, three time points at which the increase in acid secretion reached a maximum level were selected, and the average quantity of gastric acid secreted at those time points was taken as the increase in acid secretion, which was compared with the increase in acid secretion of the control group to calculate the percent inhibition for secretion of gastric acid. The results obtained are listed in Table I in which the values found are expressed as the average of 5 measurements. Inhibitory Effect on Gastric Acid Secretion Accelerated by Histamine in Pylorus-ligated Rats Compound Gastric Acid Secretion in Rats dose (mg/kg; s.c.) Rate of inhibition ( % ) Compound in Ex.1 2 59 Compound in Ex.3 2 70 Compound in Ex.10 2 36 Compound in Ex.11 2 47 Control (Cimetidine) 2 70 (B) Inhibitory Effect of the Compounds of the Present Invention on Ethanol-Induced Ulcer This test was performed in the manner similar to the method of Robert A. (Gastroenterology, 1975, Vol. 69, pp. 1045 - 1047). 30 mg/kg of the compound of this invention was orally administered to male Wister rats having a body weight of about 160 g after 24 hours fasting and after additional 30 minutes, 1 ml/animal of 100% ethanol was orally administered. One hour after, the stomach was dissected out and was fixed with formalin. Then, the length of the hemorrhagic ulcers generated at the front portion of the stomach was measured by means of a microscope and these were defined as the coefficient of ulcer (U.C.). The results obtained are listed in Table II in which the values found are expressed as the average of 5 measurements. Inhibitory Effect of the Compounds of the Present Invention on Ethanol-Induced Ulcers Compound I.R. of Ethanol-Induced Ulcer (%) (30 mg/kg; p.o.) Compound of Ex. 1 65 Compound of Ex. 3 80 Compound of Ex. 7 61 Compound of Ex. 10 73 Compound of Ex. 11 79 Compound of Ex. 13 56 Compound of Ex. 14 87 Compound of Ex. 16 58 Compound of Ex. 17 78 Compound of Ex. 18 45 Control (Cimetidine) -22.4 (C) Test of Acute Toxicity of the Compounds of This Invention Each test compound (500 mg/kg) was orally administered to ddy male mice having a body weight of about 22 g after 8 hours fasting and the general symptom and death or survival were observed. The results observed are listed in Table III. Mouse Acute Toxicity of the Compounds of the Present Invention Administrated Through P.O. Compound Number of Death (dose = 500 mg/kg; p.o) Compound of Ex. 2 0/3 Compound of Ex. 4 1/3 Compound of Ex. 5 1/3 The compounds of the present invention exhibit inhibitory effect for gastric acid secretion accelerated due to the stimulation with histamine almost identical to that of Cimetidine as shown in Table I and simultaneously show a strong inhibitory effect for damages with ethanol which is not observed when Cimetidine is used, as shown in Table II. Formulations comprising, as a principal component, the compounds represented by the general formula (I) and pharmaceutically acceptable salts thereof can be prepared by utilizing any known carriers and methods. Such formulations may be administered orally or parenterally. The dose thereof varies depending on the conditions to be treated and age and sex of the individuals to be treated, but in general 10 to 500 mg per day for adults, which are preferably administered divisionally in 1 to 4 times. The present invention will hereunder be explained in more detail with reference to the following non-limitative working Examples and the effects practically achieved will also be discussed in comparison with Comparative Examples. In this connection, the synthetic scheme in Examples 1 to 4 are shown below: Example 1: 5,6-Dimethyl-2- [4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone 2.6 g of 4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamine (this was prepared from 2-chloro-4-(1-piperidinomethyl) pyridine by the same method A disclosed in Example 1 of JP-A-61-85365) and 2.0 g of 5,6-dimethyl-2-nitroamino-4-(1H)-pyrimidone (this was prepared by the method disclosed in Reference Example of JP-A-60-228465) were dissolved in 50 ml of pyridine and the resultant solution was stirred under refluxing for 15 hours. After completing the reaction, the solvent was distilled off in vacuo and the residue obtained was purified by silica gel chromatography (eluent: ethyl acetate/methanol/aqueous ammonia = 6:1:1) to thus obtain 3.1 g of the title compound in an yield of 80.9%. IR (liq. cm⁻¹): 3340, 2930, 1740, 1600, 1460, 1390, 1300, 1250, 1130, 1025, 1000, and 680 NMR (CDCl₃, ppm): 1.2 - 1.7 (6H, m), 1.85 (3H, s), 2.15 (3H, s), 2.1 - 2.6 (4H, m), 3.3 (2H, s), 3.9 - 4.4 (2H, m), 4.8 - 5.1 (2H, d), 5.3 - 6.3 (4H, b), 6.6 - 7.0 (2H, t) and 7.9 - 8.2 (1H, d). Example 2: 5,6-Dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride The oily product (14.1 g) obtained in Example 1 was dissolved in 100 ml of isopropanol and 3.2 ml of conc. HCl solution was added thereto to form pale yellow crystals. The crystals were recrystallized from isopropanol during which the treatment with active carbon was also carried out to obtain 11.5 g of colorless crystals having a melting point of 182 - 184°C (decomposed). Yield = 74.2%. IR (KBr, cm⁻¹): 3250, 2950, 2450, 1700, 1550, 1480, 1430, 1315, 1180, 1030, 950, 890, 830, 695 and 520. NMR (DMSO-d₆, ppm): 1.4 - 2.1 (6H, m), 1.9 (3H, s), 2.25 (3H, s), 2.9 - 3.5 (4H, m), 4.0 - 4.4 (2H, m), 4.35 (2H, s), 4.8 - 5.2 (2H, m), 5.6 - 6.1 (2H, m), 7.2 - 7.5 (2H, t) and 8.2 - 8.4 (1H, d). Example 3: 5,6-Dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone The same procedures as in Example 1 were repeated except that 2.6 g of 4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamine were substituted for 2.6 g of 4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamine to form 3.6 g of the title compound (yield = 94.6%) as brownish oily product. IR (liq. cm⁻¹): 3400, 2950, 1660, 1620, 1400, 1345, 1285, 1160, 1040, 990, 860, 780 and 700. NMR (CDCl₃, ppm): 1.2 - 1.7 (6H, m), 1.85 (3H, s), 2.1 (3H, s), 2.2 - 2.5 (4H, m), 3.4 (2H, s), 3.9 - 4.2 (2H, m), 4.5 - 4.8 (2H, d), 5.5 - 6.0 (2H, m) and 4.6 - 7.3 (4H, m). Example 4: 5,6-Dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone fumarate 10 g of the oily product obtained in Example 3 were dissolved in 100 ml of isopropanol, to the resulting solution 3.03 g of fumaric acid were added and then heated to dissolve the same. The resulting solution was cooled to precipitate crystals and the crystals were recrystallized from water-containing isopropanol solution during which the solution was treated with active carbon to obtain 10.8 g (yield = 82.8%) of colorless crystals. M.P. = 113 - 117°C. IR (KBr, cm⁻¹): 3250, 2950, 2700, 1620, 1450, 1360, 1260, 1180, 1030, 980, 780 and 670. NMR (DMSO-d₆, ppm): 1.05 - 1.15 (2H, d), 1.3 - 1.8 (6H, m), 1.85 (3H, s), 2.1 (3H, s), 2.4 - 2.9 (4H, m), 3.75 (2H, s), 3.9 - 4.2 (2H, m), 4.6 - 4.9 (2H, m), 5.6 - 5.9 (2H, m), 6.65 (1H, s) and 6.75 - 7.9 (about 8H, m). Example 5: 5,6-Dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride M.P. = 92 - 95°C. IR (KBr, cm⁻¹): 3350, 2950, 2670, 1600, 1530, 1450, 1260, 1170, 1030, 950, 870, 780, 700 and 540. NMR (DMSO-d₆, ppm): 0.9- 1.15 (3H, d), 1.4 - 2.0 (9H, m), 2.1 (3H, s), 2.6 - 3.4 (4H, m), 3.85 - 4.2 (2H, m), 4.25 (2H, s), 4.1 - 4.9 (2H, m), 5.5 - 5.9 (2H, m) and 6.7 - 7.5 (4H, m). Example 6: 5-Pentyl-6-ethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone IR (liq, cm⁻¹) : 3320, 2950, 2870, 1640, 1610, 1550, 1450, 1400, 1370, 1300, 1260, 1160, 1035, 860, 770, 695, 600 and 550. NMR (CDCl₃, ppm): 0.5- 1.9 (22H, m), 2.1 - 2.8 (4H, m), 3.5 (2H, s), 3.95 - 4.3 (2H, m), 4.6 - 4.9 (2H, m), 5.65 - 5.9 (2H, m) and 6.6 - 7.4 (4H, m). Example 7: 5-Heptyl-6-methyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone IR (liq, cm⁻¹): 3350, 2950, 1660, 1550, 1400, 1350, 1270, 1150, 1130, 1090, 1050, 990, 870, 780, 700, 640 and 560. NMR (CDCl₃, ppm): 1.1- 1.9 (19H, m), 2.0 (3H, s), 2.2 (2H, s), 2.2 - 2.7 (4H, m), 3.5 (2H, s), 3.9 - 4.3 (2H, m), 4.6 - 4.9 (2H, d), 5.6 - 6.0 (2H, m) and 6.6 - 7.4 (4H, m). Example 8: 5-Heptyl-6-methyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone IR (KBr, cm⁻¹): 3350, 2950, 2880, 1650, 1615, 1560, 1480, 1350, 1305, 1150, 1040, 995, 880, 805, 780, 720 and 560. NMR (CDCl₃, ppm): 0.5 - 1.8 (21H, m), 2.15 (3H, s), 2.1 - 2.6 (4H, m), 3.35 (2H, s), 3.8 - 4.9 (3H, m), 4.7 - 5.1 (2H, d), 5.5 - 5.9 (2H, m), 6.5 - 6.9 (3H, t) and 7.85 - 8.1 (2H, d). Example 9: 5-Dodecyl-6-methyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone IR (KBr, cm⁻¹): 3350, 2930, 2870, 1640, 1615, 1560, 1480, 1290, 1150, 1120, 1040, 995, 870, 780, 720, 695 and 550. NMR (CDCl₃, ppm): 0.6 - 1.8 (31H, m), 2.15 (3H, s), 2.1 - 2.6 (4H, m), 3.3 (2H, s), 3.9 - 4.3 (2H, m), 4.8 - 5.3 (3H, m), 5.5 - 5.9 (2H, m), 6.6 - 7.0 (3H, t) and 7.9 - 8.05 (1H, d). Example 10: 5-Dodecyl-6-methyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butanylamino]-4-(1H)-pyrimidone IR (KBr, cm⁻¹): 2950, 2520, 1700, 1610, 1500, 1460, 1300, 1260, 1170, 1030, 950, 795, 770, 710, 600 and 530. NMR (CDCl₃, ppm): 1.6 - 2.0 (31H, m), 2.1 (3H, s), 2.1 - 2.55 (4H, m), 3.6 (2H, s), 4.1 - 4.4 (2H, m), 4.6 - 4.9 (2H, m), 5.6 - 5.9 (2H, s) and 5.8 - 7.8 (4H, m). Example 11: 5-Phenethyl-6-methyl-2-[4-〈4-(1-piperdinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone M.P. = 132 - 138°C. IR (KBr, cm⁻¹): 3350, 2950, 1650, 1607, 1480, 1400, 1290, 1245, 1030, 995, 870, 700, 670 and 550. NMR (DMSO-d₆, ppm): 1.2 - 1.8 (6H, m), 1.95 (3H, s), 2.2 - 2.6 (4H, m), 2.4 - 2.8 (4H, m), 3.45 (2H, s), 3.9 - 4.25 (2H, m), 4.95 - 5.2 (2H, s), 5.5 - 6.0 (2H, m), 6.6 - 7.1 (2H, t), 7.3 (5H, s) and 8.0 - 8.25 (1H, d). Example 12: 5-Phenethyl-6-methyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone M.P. = 125 - 130°C. IR (KBr, cm⁻¹): 3350, 2950, 1640, 1550, 1480, 1350, 1275, 1140, 1035, 875, 765, 697 and 550. NMR (DMSO-d₆, ppm): 1.2 - 1.7 (6H, m), 1.9 (3H, s), 2.2 - 2.5 (4H, m), 2.4 - 2.7 (4H, m), 3.35 (2H, s), 3.8 - 4.2 (2H, m), 4.6 - 4.9 (2H, d), 5.6 - 5.9 (2H, m), 6.7 - 7.4 (4H, m) and 7.25 (5H, s). Example 13: 5-Benzyl-6-methyl-2- [4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino] -4-(1H)-pyrimidone M.P. = 112 - 118°C. IR (KBr, cm⁻¹): 3350, 2950, 1640, 1605, 1490, 1420, 1400, 1350, 1285, 1140, 1040, 1000, 870, 780, 700, 640 and 560. NMR (DMSO-d₆, ppm): 1.2 - 1.8 (6H, m), 2.05 (3H, s), 2.1 - 2.6 (4H, m), 3.4 (2H, s), 3.7 (2H, s), 3.9 - 4.2 (2H, m), 4.85 - 5.1 (2H, d), 5.6 - 5.9 (2H, m), 6.6 - 7.0 (3H, t), 7.2 (5H, s) and 7.8 - 8.2 (1H, d). Example 14: 5-Benzyl-6-methyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone M.P = 109 - 114°C. IR (KBr, cm⁻¹): 3350, 2940, 1640, 1615, 1490, 1450, 1275, 1140, 1040, 770, 690 and 550. NMR (DMSO-d₆, ppm): 1.3 - 1.7 (6H, m), 2.1 (3H, s), 2.2 - 2.6 (4H, m), 3.4 (2H, s), 3.7 (2H, s), 3.8 - 4.2 (2H, m), 4.5 - 4.8 (2H, d), 5.5 - 5.9 (2H, m), 6.6 - 7.7 (4H, m) and 7.2 (5H, s). Example 15: 5-(3,4-methylenedioxy)-benzyl-6-methyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone M.P. = 94 - 102°C. IR (KBr, cm⁻¹): 3350, 2950, 1640, 1610, 1495, 1450, 1350, 1240, 1035, 920, 795, 695, 640 and 560. NMR (DMSO-d₆, ppm): 1.1 - 1.8 (6H, m), 2.05 (3H, s), 2.1 - 2.7 (4H, m), 3.35 (2H, s), 3.55 (2H, s), 3.8 - 4.2 (2H, m), 4.5 - 4.8 (2H, m), 5.5 - 5.6 (2H, m), 5.85 (2H, s) and 6.4 - 7.3 (7H, m). Example 16: 5-(3,4-methylenedioxy)-benzyl-6-methyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone M.P. = 90 - 100°C. IR (KBr, cm⁻¹): 3350, 2950, 1650, 1615, 1490, 1290, 1240, 1040, 930, 800, 640 and 560. NMR (DMSO-d₆, ppm): 1.1 - 1.7 (6H, m), 2.01 (3H, s), 2.1 - 2.5 (4H, m), 3.4 (3H, s), 3.6 (3H, s), 3.8 - 4.2 (2H, m), 4.8 - 5.1 (2H, d), 5.5 - 5.9 (2H, m), 5.9 (2H, s), 6.6 - 7.0 (5H, m) and 7.9 - 8.2 (1H, d). Example 17: 5-(p-methoxybenzyl)-6-methyl-2-[4-〈3-(1-piperidino-methyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone IR (liq, cm⁻¹): 3350, 2950, 1640, 1610, 1520, 1480, 1250, 1180, 1040, 800 and 700. NMR (DMSO-d₆, ppm): 1.2 - 1.7 (6H, m), 1.8 (3H, s), 2.0 (3H, s), 2.1 - 2.7 (4H, m), 3.4 (2H, s), 3.7 (3H, s), 3.8 - 4.3 (2H, m), 4.6 - 4.9 (2H, m), 5.5 - 5.8 (2H, m) and 6.4 - 7.5 (8H, m). Example 18: 5-(3,4-methylenedioxy)-benzyl-6-n-propyl-2-[4-3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamine]-4-(1H)-pyrimidone IR (liq, cm⁻¹): 3350, 2960, 2800, 1660, 1390, 1340, 1160, 1120, 1040, 990, 922, 870, 790, 770, 695, 630 and 500. NMR (CDCl₃, ppm): 0.6 - 1.1 (3H, t), 1.1 - 1.9 (8H, m), 1.95 (3H, s), 2.2 - 2.6 (4H, m), 3.45 (2H, s), 3.7 (2H, s), 3.8 - 4.1 (2H, m), 4.5 - 4.75 (2H, d), 5.5 - 5.8 (2H, m), 5.9 (2H, s) and 6.6 - 7.4 (7H, m). Example 19: 5,6-Dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone dihydrochloride M.P. = 204 - 206°C. IR (KBr, cm⁻¹): 3350, 2750, 1670, 1600, 1460, 1250, 1170, 1035, 950, 860, 795, 690 and 535. Example 20: 5,6-Dimethyl-2-[4-〈4-(1-piperdinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone dihydrochloride M.P. = 275 - 278°C. IR (KBr, cm⁻¹): 3300, 2970, 1640, 1560, 1410, 1300, 1170, 1060, 859, 800, 642 and 558.

Claims: Claims for the following Contracting States : AT, BE, CH, DE, FR, GB, IT, LI, NL, SE A pyrimidone compound represented by the formula (I) and a pharmaceutically acceptable salt thereof: wherein R¹ and R² each represents a linear or branched alkyl group having 1 to 12 carbon atoms or a group represented by the formula: (wherein n is an integer of 1 to 3 and R³ and R⁴ each represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms or R³ and R⁴ together form a methylenedioxy group); and A represents a group having the formula: (wherein m and p each represents an integer of 1 to 3; and R⁵ to R⁸ each represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, or -NR⁵R⁶ and -NR⁷R⁸ each represents a group (wherein q is an integer of 4 to 6)). A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the alkyl group having 1 to 12 carbon atoms as shown R¹ and R² are selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, hexyl, heptyl, octyl, decyl or dodecyl groups; the alkyl group having 1 to 6 carbon atoms as shown R³ to R⁸ are selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl or isopentyl groups; the position of the substituent: -(CH₂) m -NR⁵R⁶ in the formula: is the m- or p-position; and the group -(CH₂) p -NR⁷R⁸ in the formula: is present at the 4- or 6-position. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the salt is an acid-addition salt with hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, methanesulfonic acid, maleic acid, fumaric acid, oxalic acid, formic acid or acetic acid. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the compound is a 5,6-di-substituted-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or pharmaceutically acceptable salts thereof. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 4 wherein the compound is 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride or 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone dihydrochloride. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the compound is 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone fumarate. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the compound is a 5,6-di-substituted-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or a pharmaceutically acceptable salt thereof. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 7 wherein the compound is a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or pharmaceutically acceptable salts thereof. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 8 wherein it is a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride or a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone dihydrochloride. A pharmaceutical composition containing as a pharmaceutically active ingredient a pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in any of claims 1 to 9. Use of a pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in any of claims 1 to 9 for producing a pharmaceutical composition useful in treating gastric diseases. Claims for the following Contracting State : ES A process for making a pyrimidone compound represented by the formula (I) and a pharmaceutically acceptable salt thereof: wherein R¹ and R² each represents a linear or branched alkyl group having 1 to 12 carbon atoms or a group represented by the formula: (wherein n is an integer of 1 to 3 and R³ and R⁴ each represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms or R³ and R⁴ together form a methylenedioxy group); and A represents a group having the formula: (wherein m and p each represents an integer of 1 to 3; and R⁵ to R⁸ each represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, or -NR⁵R⁶ and -NR⁷R⁸ each represents a group (wherein q is an integer of 4 to 6)) comprising (A) conducting a reaction according to one of the following reaction schemes: (1) (2) or (3) when A represents a group of the formula wherein R¹, R², R⁵, R⁶, and A are the same as defined above, Z represents a nitroamino group, a lower alkylthio group or a lower alkoxy group, X represents a halogen atom and M represents an alkali metal and, optionally, (B) forming a pharmaceutically acceptable salt thereof by acid-addition with the corresponding acid. A process as set forth in claim 1 wherein the alkyl groups having 1 to 12 carbon atoms of R¹ and R² are selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, hexyl, heptyl, octyl, decyl or dodecyl groups; the alkyl groups having 1 to 6 carbon atoms of R³ to R⁸ are selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl or isopentyl groups; the position of the substituent: -(CH₂) m -NR⁵R⁶ in the formula: is at the m- or p-position; and the group -(CH₂) p -NR⁷R⁸ in the formula: is present at the 4- or 6-position. A process as set forth in claim 1 wherein the acid used to make the acid-addition salt of compound (I) is hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, methanesulfonic acid, maleic acid, fumaric acid, oxalic acid, formic acid or acetic acid. A process as set forth in claim 1 wherein compound (I) is a 5,6-di-substituted-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or a pharmaceutically acceptable salt thereof, A is 3-(1-piperidinomethyl)phenyl-, and -CH₂CH=CHCH₂- is in the cis configuration. A process as set forth in claim 4 wherein compound (I) is 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride or 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone dihydrochloride, R¹ and R² are each methyl, and the process comprises forming the acid-addition salt using hydrochloric acid as the acid. A process as set forth in claim 1 wherein compound (I) is 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone fumarate, R₁ and R² are each methyl, A is 3-(1-piperidinomethyl)phenyl-, -CH₂CH=CHCH₂- is in the cis configuration, and the process comprises forming the acid-addition salt using fumaric acid as the acid. A process as set forth in claim 1 wherein compound (I) is a 5,6-di-substituted-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or a pharmaceutically acceptable salt thereof, A is 4-(1-piperidinomethyl)-pyridyl-2-, and -CH₂CH=CHCH₂- is in the cis configuration. A process as set forth in claim 7 wherein compound (I) is a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or a pharmaceutically acceptable salt thereof and R¹ and R² are each methyl. A process as set forth in claim 8 wherein compound (I) is a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride or a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyri-dyl-2-oxy〉-cis-butenylamino]-4-(1H)-pyrimidone dihydrochloride and the process comprises forming the acid-addition salt using hydrochloric acid as the acid. A process for making a pharmaceutical composition comprising combining compound (I) or a pharmaceutically acceptable salt thereof as set forth in any of claims 1 to 9 with a pharmaceutically acceptable carrier. A process as set forth in claim 10 wherein the pharmaceutical composition is useful in treating gastric diseases. Claims for the following Contracting State : GR A pyrimidone compound represented by the formula (I) and a pharmaceutically acceptable salt thereof: wherein R¹ and R² each represents a linear or branched alkyl group having 1 to 12 carbon atoms or a group represented by the formula: (wherein n is an integer of 1 to 3 and R³ and R⁴ each represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms or R³ and R⁴ together form a methylenedioxy group); and A represents a group having the formula: (wherein m and p each represents an integer of 1 to 3; and R⁵ to R⁸ each represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, or -NR⁵R⁶ and -NR⁷R⁸ each represents a group (wherein q is an integer of 4 to 6)). A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the alkyl group having 1 to 12 carbon atoms as shown R¹ and R² are selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, hexyl, heptyl, octyl, decyl or dodecyl groups; the alkyl group having 1 to 6 carbon atoms as shown R³ to R⁸ are selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl or isopentyl groups; the position of the substituent: -(CH₂) m -NR⁵R⁶ in the formula: is the m- or p-position; and the group -(CH₂) p -NR⁷R⁸ in the formula: is present at the 4- or 6-position. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the salt is an acid-addition salt with hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, methanesulfonic acid, maleic acid, fumaric acid, oxalic acid, formic acid or acetic acid. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the compound is a 5,6-di-substituted-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or pharmaceutically acceptable salts thereof. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 4 wherein the compound is 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride or 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone dihydrochloride. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the compound is 5,6-dimethyl-2-[4-〈3-(1-piperidinomethyl)-phenoxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone fumarate. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 1 wherein the compound is a 5,6-di-substituted-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or a pharmaceutically acceptable salt thereof. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 7 wherein the compound is a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone or pharmaceutically acceptable salts thereof. A pyrimidone compound or a pharmaceutically acceptable salt thereof as set forth in claim 8 wherein it is a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone hydrochloride or a 5,6-dimethyl-2-[4-〈4-(1-piperidinomethyl)-pyridyl-2-oxy〉-cis-2-butenylamino]-4-(1H)-pyrimidone dihydrochloride. A process for making a pharmaceutical composition comprising combining compound (I) or a pharmaceutically acceptable salt thereof as set forth in any of claims 1 to 9 with a pharmaceutically acceptable carrier. A process as set forth in claim 10 wherein the pharmaceutical composition is useful in treating gastric diseases.

Inventors: NOHARA FUJIO, NOHARA, FUJIO
Applicants: IKEDA MOHANDO CO, IKEDA MOHANDO CO., LTD.
Application year: 1988
Main classification: C07D239
IPC codes: A61P1, C07D405, C07D401, A61K31, C07D239