GB2125785A - 2-(o-Carboxyphenylamino)-6H- pyrimido (2,1-b)-quinazolone-6 and derivatives thereof - Google Patents

Abstract

The invention relates to 2-(o-carboxyphenylamino)-6H- pyrimido(2,1-b)-quinazolone-6 and its derivatives, method of producing same and application as medicinals. 2-(o-carboxyphenylamino)-6H- pyrimido(2,1-b)-quinazolone-6, having the structural formula <IMAGE> Derivatives of 2-(o-carboxyphenylamino)-6H- pyrimido(2,1-b)-quinazolone-6, having the structural formula <IMAGE> where A<+> are alkali metals, monoethanolamine, diethylamine. Derivatives of 2-(o-carboxyphenylamino)-6H- pyrimido(2,1-b)-quinazolone-6, having the structural formula <IMAGE> where R is OH, alkyloxy C 1-4; NHR<1>, where R<1> is H, alkyl C 1-4, phenyl, aralkyl. A are salts of inorganic acids. The invention is applied in medicine for treatment of rheumatism and other diseases accompanied by an inflammatory process (arthritis, polyserositis etc.).

Description

SPECIFICATION 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 and derivatives thereof, method of producing and application The invention deals with novel substances relating to pyrimido-quinazolones, and specifically to 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and drivatives thereof, method of producing same and application as medicinals.

The invention can be utilized in the medical practice.

According to the invention, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 has the following structural formula:

The above compound is a crystalline light yellow substance, soluble in solutions of soda and alkalis, and insoluble in water, alcohol, acetone, and chloroform. Its melting point is 290"C (with decomposition).

Derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 have the following structural formula:

where A+ are alkali metals, monoethanolamine, diethylamine.

Said compounds are colorless crystalline substances soluble in water and lower alcohols, and insoluble in ethers, chloroform, dimethyl formamide. Their melting point is 250 to 3000C (with decomposition).

Still another group of derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 have the following structural formula:

where R is OH, alkyloxyl C 1-4, NHR1 where R is H, alkyl C 1-4, phenyl, aralkyl, A are salts of inorganic acids.

Other derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 have the following structural formula:

where R is alkyloxyl C 1-4, NHP1, where P1 is alkyl C 1-4.

The above specified compounds are crystalline substances which are difficulty soluble in alcohols, dimethyl formamide, insoluble in water, acetone, and chloroform. Their melting point is 240 to 2700C (with decomposition).

2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and drivatives thereof possess pharmacological activity and can be successfully used in medicine for the treatment of rheumatism and other diseases accompanied by an inflammatory process arthritis, polyserositis etc.).

The invention also consists in a method of producing 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)quinazolone-6 and derivatives thereof, wherein 2,4-dichloropyrimidine is brought into interaction with anthranilic acid, or a sodium salt of anthranilic acid, or substituted esters, or amides of anthranilic acid in an aqueous medium, or an inorganic solvent at a temperature of 90 to 120"C and is held at this temperature for 2 to 4 hours, and an end product is separated using a conventional method.

The above method allows the above novel chemical substances to be produced art a high yield (70 to 80%).

The method is technologically effective, does not require the application of complicated equipment and allows the products to be produced in one stage.

It is expedient to carry out interaction between 2,4-dichloropyrimidine and a sodium salt of anthranilic acid in an aqueous medium having pH of 8.0 to 8.5.

The above modification of the method allows more soluble compounds to be produced in one stage.

It is most economically to conduct the interaction between 2,4-dichloropyrimidine and substituted esters or amides of anthranilic acid with a ratio between the reactive substances being respectively 1:2 in an organic solvent.

It is possible to additionally neutralize anions of acids of the product using conventional techniques.

Said modification of the method allows the range of produced products to be expanded.

To accelerate the process and to increase the yield of the end product, it is expedient to utilize alcohols, or dimethyl formamide, or acetic acid, or mixtures thereof as an organic solvent.

The invention also consists in the provision of a chemotherapeutic antiphlogistic, containing 2-(o carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 or derivatives thereof and a pharmaceutical basic material as an acting source.

The above specified chemotherapeutic preparation is intended for treating patients suffering from rheumatoid arthritis, Bekhterev's disease, Reiter's disease, deforming asthenoarthrosis, chronic diseases of lungs and biliary tracts. This preparation can be used independently as well as in a mixture with other antiphlogistics (being of both steroid and nonsteroid nature).

One of modifications of the chemotherapeutic antiphiogistic is a preparation containing, as an acting source, (2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride in an amount of 0.25 to 0.5 g, and a pharmaceutical basic material.

A pharmaceutically acceptable filler for tablets is used as a pharmaceutical basic material. This filler may be sugar, milk sugar, starch, glucose, sodium hydrocarbonate, sodium chloride, disubstituted calcium phosphate, kaolin, dextrin, cacao, acetyl cellulose, methyl cellulose, polyvinyl alcohol, talc, calcium stearate, magnesium stearate, acid gelatin solution.

A modification of the chemotherapeutic antiphlogistic is a preparation containing, as an acting source, 2-(o-carboxyphenylamino)-6H-pyrim ido(2,1 -b)-q uinazolone-6 hydrochloride and a pharmaceutical basic material taken in the following ratio (percent by weight): 2-(o-carboxyphenylamino)-6H-pyrimido (2,1 -b)-quinazolone-6 hydrochloride 5 to 10 pharmaceutical basic material 90 to 95 The pharmaceutical basic material can be in the form of an ointment, base, e.g. animal fats, fatty oils, lanolin, wax, spermaceti, fatty acids, higher alcohols, liquid paraffin, cellulose ethers, polysilicone compounds, phytosterols, bentonite clays.

Said ointments were used for external application in non-infectious burn lesions of skin regions.

Still another modification of the chemotherapeutic antiphlogistic is a preparation containing, as a pharmaceutical basic material, a base for a paste.

The above specified preparation is expedient to be utilized in stomatology for treatment of various inflammatory diseases, particularly paradontosis. Clinical checking has demonstrated the efficiency of application of this preparation.

In addition, a modification of the chemotherapeutic antiphlogistic is a preparation containing, as an acting source, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 hydrochloride in an amount of 0.1 to 0.5 g, and a pharmaceutical basic material.

The pharmaceutical basic material is a pharmaceutical filler for a suppository, e.g. cacao butter or a gelatinous-glyceric base.

2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives were tested for acute toxicity.

Acute toxicity was determined in white mice (18 to 25 g), rats (150 to 180 g), rabbits (2000 to 3000 g), and cats (2500 to 3200 g).

Acute toxicity of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 and its derivatives was determined in intra-abdominal and peroral administration; for cats in peroral administration. The state of the animals was observed for 7 days. The statistical analysis of obtained data was carried out in accordance with the method of Litchfield, Wilcockson and Van der Waerden. The results are given in Table 1. For the purpose of comparison, the same table shows the data on acute toxicity of the prior art antiphlogistics.

TABLE 1 Kind Way of of adminani- istramals tion LD50, mg/kg 2-(o- 2-(o- Methyl 2-(o- Mephen- Phenyl- Meth carbo- carbo- ester methyl- amine butazo- od of xyphe- xyphe- of 2- carba- acid-N- ne-1,2- deter nylami- nylami- (o-car- mide (2,3- diphe- mina no)-6H- no)-6H- boxy- phenyl- dime- nyl-4- tion pyrimi- pyrimi- phenyl- amino- thyl butyl do(2,1- do(2,1- amino)- 6H-py- phenyl) pyraso b)-qui- b)-qui- 6H-py- rimido kanthra- lidine nazolo- nazolo- rimido (2,1-b) nilic dion ne-6 ne-6 (2,1-b) -quina- acid 3,5 hydro- -quina- zolone chlori- zolone-6 -6 de 1 2 3 4 5 6 7 8 9 Mice Intra- 1050 1050 1160 3000 150 250 Litch abdom- field & BR< inal Wilcock Peroral 3400 3400 - - - - son Rats Intra- 980 980 - - 180 210 -" abdom inal Peroral 3800 3800 - - 520 720 -" Rab- Intra- 1750 1750 - - - - Van der bits abdo- Waerden minal Peroral 5000 500 - - - Cats Peroral 5000 - - - - LD50 means hereinafter 1/2 of a lethal dose.

Chronic toxicity of 2-(o-carboxyphenylamino)-6H-pyrimido (2,1 -b)-quinazolone-6 and its derivatives was determined in rats and guinea pigs. The above substances were administered daily, once a day, perorally through a gastric tube in a conditionally therapeutic dose (100 mg/kg of mass) dissolved in 0.5 ml distilled water. Apricot gum, gum arabic, gelatose, starch, a serge-like fabric were used as an emulgator.

The results of investigations prove that 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 and its derivatives, when administered perorally in a selected dose (100 mg/kg), have not exerted appreciable effect for 10 days on the composition of peripheric blood in experimental animals. In the daily administration of said compound during 2 months, the results were obtained indicating the fact that general analysis of blood, differential blood count, and thrombocytes, which had been determined in dynamics during the whole experiment once a day, remained within the limits of physiological variations for the given of animals.

This circumstance differentiates advantageously 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)- quinazolone-6 and its derivatives from other nonsteroid antiphlogistics which, when being administered for a long time, adversely effect to a variable degree the composition of peripheric blood in patients.

To reveal the effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives on the organism in prolonged administration, the morphologic studies were conducted on the internal organs of experimental animals (rats), i.e. lungs, heart, liver, kidneys, adrenal giands, mucous coats of stomach and intestine.

2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 or its derivatives were administered daily, perorally through a gastric tube for 3 months in the above specified dose. The animals were killed after 5,30, and 90 days. In total, during 3 months the animals have received more than 3LD50. The tissues were fixed in formol and Carnois liquid. Paraffin and frozen sections were prepared. Histologic and histochemical methods of investigation were used.

In the thourough morphologic study of organs of animals which for a long time received 2-(o carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives in a conditionally therapeutic dose, no pathologic changes were noticed as against the norm.

Antiinflammatory effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives was evaluated from antiexudative and antiproliferative efficiency and from its influence on the formation of necrotic processes within the inflammation focus.

Antiexudative effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives was studied using a model of foot edema in a rat, caused by various phlogogenic stimuli (formalin, carrageenin, ovalbumin, serotonin, trypsin, and hyaluronidase).

The growth of foot endema in the rat was registered in dynamics after each hour from the moment of subplantar administration of a stimulus during 5 hours. Percentage of inhibition of the foot edema in the rat was calculated from the following formula: percentage of inhibition = Vk-VO 100, Vk where Vk is the volume of a control edematic foot minus the initial volume of the same foot prior to edema; V0 is the volume of the tested edamaticfoot minus the initial volume of the same foot prior to edema.

The development of the edema in the formalin inflammation was characterized by a moderate growth of the edema, the maximum magnitude of its acuteness being 3 to 4 hours after subplantar administration of a stimulus (2% solution of formalin, 0.1 ml to each foot). By this time, a classical local inflammation developed in the animals, said inflammation accompanied by the formation of an edema, hyperemia, and considerable painfulness. The inflammation of a foot is maintained for 7 and more days, and after 3 to 4 days necrosises are often formed in the place of injection of formalin.

Antiinflammatory effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 hydrochloride is given in Table 2 as against that of the prior art antiphlogistics.

TABLE 2 Way of Percent admini- Number age of Dose, strati- of inhibi- Therapeuti Preparation mg/kg on tests tion cal index 2-(o-carboxyphenyl- 5 Intra- 5 28 59.8 amino)-6H-pyrimido 10 abdom- 5 47 59.8 (2,1-b)-quinazolone-6 49 inal 5 55 59.8 98 5 70 59.8 2-(o-carboxyphenyl- 5 Intra- 5 31 61.2 amino)-6H-pyrimido 10 andom- 5 50 61.2 (2,1-b)-quinazolone-6 49 inal 5 57 61.2 hydrochloride 98 5 71 61.2 Mephenamine acid-N- 9 Intra- 5 22 1.5 (2,3-dimethyl phenyl) 18 abdom- 5 24 1.5 anthranilic acid 36 inal 5 31 1.5 72 5 33 1.5 Phenylbutazone-1,2- 21 Intra- 5 17 2.8 diphenyl-4-butyl 42 andom- 5 40 2.8 pyrasolidine-dion- 82 inal 5 51 2.8 3,5 Sodium salicylate-6- 65 Intra- 5 14 1.8 oxybenzoicacid, 130 abdom- 5 24 1.8 sodium salt 260 inal 5 41 1.8 Therapeutical index is hereinafter as LD50 End50, where ED50 is a dose allowing the effect to be achieved in 50% cases out of 100%.

The obtained results indicate that the development of a formalin edema of a foot in the rat was the most actively depressed by 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride. The advantages of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and those of its derivative are also confirmed by pharmacotherapeutic width of effect (evaluated from therapeutical index).

Simultaneously with the inhibition of formalin edema, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)quinazolone-6 and its derivative decreased other symptoms of inflammation, i.e. hyperemia and painfulness, and prevented subsequent formation of necrotic foci at the location of injection of formalin, which fact is almost noncharacteristic of mephenamine acid, butadiene and sodium salicylate.

Similar results have been obtained for other derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)quinazolone-6.

Taking into account that nonsteroid antiphlogistics produce different influences on inflammatory edemas of various genesis, the action of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives on other types of edemas has been studied.

A carrageenin edema was induced by supblantar administration in rats of 0.1 ml 1% solution of carrageenin (polysaccharide prepared from Iceland or pearl moss).

In the control test, the edema grew quickly and reached the maximum magnitude (201%) after 3 to 4 hours following the injection of carrageenin. Table 3 gives the data on the inflammatory action of 2-(ocarboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6, and 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 - b)-quinazolone-6 hydrochloride. For the purpose of comparison, this table also gives the data on the inflammatory action of the prior art antiphlogistics.

TABLE 3 Way of Percen admin- Number tage of Therapeu Dose, istra- of inhibi- tical in Preparation mg/kg tion tests tion dex 2-(o-carboxyphenylamino) 25 Intra- 5 11 9.8 -6H-pyrimido(2,1-b)- 49 abdom- 5 25 quinazolone-6 98 inal 5 54 2-(o-carboxyphenylamino) 25 Intra- 5 12 10.9 -6H-pyrimido(2,1-b)- 49 abdom- 5 26 quinazolone-6 hydrochlo- 98 inal 5 55 ride Mephenamine acid-N-(2,3- 25 Intra- 5 33 1.8 dimethyl phenyl) anthra- 50 abdom- 5 44 nilicacid 100 inal 5 50 Phenylbutazone-1,2-di- 21 Intra- 5 27 3.5 phenyl-4-butyl purasoli- 42 abdom- 5 44 dine-dion-3,5 84 inal 5 51 Sodium salicylate-6-oxy- 65 Intra- 5 14 5.6 benzoic acid, sodium salt 90 abdom- 5 32 130 inal 5 56 It follows from the above Table that 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 and its derivative possess a higher antiinflammatory activity.

An ovalbumin edema was induced by subplantar administration in rats of egg albumin (0.1 ml per foot).

The edema developed very intensely, i.e. reached the maximum magnitude (191%) as soon as after 1 hour following the injection of ovalbumin, and completely disappeared by the end of the day.

The preparation under studies were administered in the given investigations in a dose corresponding to 1/1 OLD50 for the rats in the intra-abdominal administration.

Antiexudative effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives with the given type of edema corresponds to the level of mephenamine acid and sodium salicylate. At the moment of maximum development of an ovalbumin edema (1 to 2 hours after injection of ovalbumin), its manifestation was inhibited by 27 to 30%. During subsequent hours, the antiinflammatory effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives of mephenamine acid and sodium salicylate increased. With the given kind of aseptic inflammation, phenylbutazone did not produce antiedematic effect.

Antiproliferative properties of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 and its derivatives have been studied as against other nonsteroid preparations in the experiments with "cotton granuloma".

The term "cotton granuloma" means hereinafter the formation of a granular-fibrous tissue around cotton balls implanted into experimental animals.

The influence of these nonsteroid antiinflammatory preparations on the formation of a "cotton granuloma" is shown in Table 4.

TABLE 4 Percen Number tags of Dose, of inhibi- Therapeuti Preparation mg/kg tests tion cal index 2-(o-carboxyphenylamino)- 48 5 17 20.5 6H-pyrimido(2,1-b)-quina- 95 9 25 zolone-6 190 7 50 2-(o-carboxyphenylamino)- 48 5 18 22.3 6H-pyrimido(2,1-b)-quina- 95 9 24 zolone-6 hydrochloride 190 7 52 Mephenamine acid-N-(2,3- 13 9 33 7.43 dimethyl phenyl) anthrani- 52 7 42 lic acid 78 5 52 Phenylbutazone-1,2-diphe- 18 10 6 8.27 nyl-4-butyl pyrasolidine- 72 7 44 dion-3,5 108 5 58 Sodium salicylate-6-oxy- 60 8 8 7.27 benzoic acid, sodium salt 80 20 20 160 36 36 240 52 52 As can be seen from the above data, the most effective among the given preparations were those of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 - b)-quinazolone-6 hydrochloride, and mephenamine acid.

At the same time, pharmacotherapeutic width of effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)quinazolone-6 and its derivative 2-(o-carboxyphenylami no)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride is three times that of mephenamine acid, sodium salicylate, and phenylbutazone. The inhibition of proliferative processes of other derivatives of proliferative processes of other derivatives of 2-(o carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 is at the level of inhibition of 2-(o carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride.

The analgetic activity of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivative was judged from the variation of the threshold of pain sensitivity in the contact-heat stimulation.

Table 5 gives the data on the analgetic activity of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)- quinazolone-6 and its derivative 2-(o-carboxyphenylami no)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride in the contact-heat stimulation. For the purpose of comparison, this table also gives the data on the analgetic activity of the prior art antipholgistics.

TABLE 5 Increase in latent period of Number pain reac- Therapeu Dose, of tion in tical in Preparation mg/kg tests mice, % dex 1 2 3 4 5 2-(o-carboxyphenylamino)- 52 7 30 10.8 6H-pyrimido(2,1 -b)-qui- 105 10 51 nazolone-6 157 8 60 2-(o-carboxyphenylamino)- 52 7 31 11.0 6H-pyrimido(2,1-b)-quina- 105 10 52 zolone-6 hydrochloride 157 8 62 Mephenamine acid-N-(2,3- 3.5 9 18 8.3 dimethyl phenyl) anthra- 7.0 8 36 nilicacid 15 9 43 Phenylbutazone-1,2-diphe- 25 6 8 4.7 nyl-4-butyl pyrazolidine- 50 7 43 dion-3,5 100 9 92 Sodium salicylate-6-oxy- 32 8 28 5.9 benzoic acid, sodium 65 8 38 salt 130 7 59 It follows from Table 5 that in the contact-heat stimulation, mephenamine acid possessed the most expressed analgetic effect.The analgetic activity of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)- quinazolone-6 and its derivative is considerably lower in this kind of stimulation than that of mephenamine acid and pheylbutazone, and is higher than that of sodium salicylate. However, 2-(o-carboxyphenylamino) 6H-pyrimido(2,1 -b)-quinazolone-6 and its derivatives have greatest width of analgetic activity. Similar results have been obtained in other derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6.

Antipyretic effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives has been investigated in rats suffering from pyrogenal fever. Maximum decrease in the temperature (degrees) was determined. In all the tests, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 was used in a dose constituting 5% of LD50, while the other preparations were used in a dose constituting 70% of LD50.

Table 6 gives the data on antipyretic effect of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone- 6 and its derivatives. For the purpose of comparison, this table also gives the data on antipyretic effect of the prior art antiphlogistics.

TABLE 6 Antipyretic effect (maximum decrease in temperature), Preparation "C 2-(o-carboxyphenylamino)-6H-pyrimido (2,1-b)-quinazolone-6 1.4 2-(o-carboxyphenylamino)-6H-pyrimido (2,1 -b)-quinazolone-6 hydrochloride 1.4 Indometacin 1-(para-chlorobenzoyl)5 metoxy-2-methyl-indole-3-acetic acid 0.7 Bruphen-2-(para-isobutyl phenyl) propionic acid 1.3 Mephenamine acid-N-(2,3-dimethyl phenyl) anthranilic acid 1.2 According to the obtained data, antipyretic activity of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)quinazolone-6 and its derivative is at the level of such preparations as bruphen and mephenamine acid, and considerably exceeds that of indometacin.

Extensive clinical studies of the preparation made in the form of tablets containing 2-(o carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride have been conducted. More than 400 patients of different age were observed, suffering from active rheumatism, rheumatoid arthritis, Bekhterev's disease, Reiter's disease, deforming astheno-arthrosis, chronic diseases of lungs and biliary tracts.

The preparation was used in a daily dose of from 1.5-3.0 to 5.0 g. The duration of the treatment course was from two weeks to three months. Subjective improvement was observed by the 2nd-4th day, while objective improvement was registered after 7 to 10 days from the beginning of the treatment.

The chemotherapeutic preparation in the form of a paste was applied in stomatology for the treatment of paradontosis.

The method of treatment was the utilization of a paste containing 2-(o-carboxyphenylamino)-6Hpyrimido(2,1 -b)-quinazolone-6 hydrochloride as an acting source consisted in the following: Pathologic tooth-gingival pockets were washed with a solution of antiseptics (nitrofurazone, rivanol) with subsequent introduction of the inventive paste into said pockets. To prolong the curative effect, the introduced waste was covered with a hardenable bandage.

The course of treatment, depending on the passage and degree of development of a dystrophicinflammatory form of paradontosis, included 3 to 10 sessions conducted daily or every other day.

The above specified method of treatment is simple and can be conducted both in a hospital or under ambulatory conditions. 175 patients were subjected to the treatment of paradontosis with the use of said paste, the treatment being successful in all the cases.

A positive effect was also obtained in the case of utilization of said chemotherapeutical preparation having an ointment base and a base for suppository.

The invention is further explained in terms of specific examples of embodiments thereof.

Example 1 Anthranilic acid in an amount of 27.4 g was dissolved in 200 ml of 1 h solution of sodium hydroxide. To this solution was added 2,4-dichloropyrimidine in an amount of 14.9 g, following which the resulting mixture was heated with stirring to a temperature of 1 OO"C. The reaction mass was held at this temperature for 3 hours, cooled, and the formed precipitate of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 was filtered. Then the precipitate thus obtained was purified by recrystallization from dimethyl sulfoxide, acetic acid, or reprecipitated from an alkali solution using an acid. The melting point of the precipitate was 290"C (with decomposition). The yield of the end product was 75%.

Example 2 Anthranilic acid in an amount of 27.4 g was dissolved in 200 ml of 1 h solution of sodium hydroxide. The resulting solution was heated to a temperature of 90"C, and a solution of 14.9 g 2,4-dichloropyrimidine in 50 ml di methyl formamide was added thereto gently with stirring. Following this, the temperature was raised to 100"C, and the resulting mixture was held for 2 hours. A precipitate thus formed of 2-(o carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 was filtered after cooling and treated similarly to the method described in Example 1.

Example 3 To a solution of 27.4 g anthranilic acid in 200 ml of 1 h solution of sodium hydroxide heated to a temperature of 90"C, was added a solution of 14.9 g 2,4-dichloropyrimidine in 50 ml alcohol. The reaction mixture was stirred at a temperature of 100"C and held for 4 hours. Then the mixture was treated as specified in Example 1.

Example 4 Anthraniiic acid in an amount of 3.0 g was dissolved in 300 ml of 0.1 h solution of sodium hydroxide. To this solution was added 2,4-dichloropyrimidine in an amount of 1.5 g, and the resulting mixture was heated to a temperature of 100 C and held with stirring for 2 hours. Then 200 ml of the solution were evaporated, a precipitate of a sodium salt of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6, which precipitated after cooling, was filtered, and purified by recrystallization from alcohol.

Example 5 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazoione-6 in an amount of 3.32 g (Example 1) was added to a solution of 0.4 g sodium hydroxide in 50 ml absolute alcohol. The resulting mixture was left for dissolution, following which a sodium salt of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 was separated by adding 200 ml ether to the solution, and purified by recrystallization from alcohol.

Example 6 To a suspension of 3.32 g 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 in 10 ml alcohol was added with stirring 2-aminoethanol in an amount of 0.65 g. First, the starting substances were dissolved, following which a novel precipitate formed, said precipitate being an ethanol ammonium salt of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6, a crystalline substance soluble in water. The melting point of this substance was 255"C (with decomposition). The yield of the end product was 80%.

Example 7 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 in an amount of 3.32 g was mixed with 10 ml alcohol, and diethyl amine in an amount of 0.75 g was added thereto. The resulting solution of diethyl ammonium salt of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 was treated as specified in Example 6. The melting point of this substance was 270"C (with decomposition). The yield of the end product was 82%.

Example 8 Anthranilic acid in an amount of 27.5 g and 14.9 g 2,4-dichloropyrimidine dissolved in 200 ml acetic acid were heated with stirring to a temperature of 105"C and held at this temperature for 3 hours. A precipitate thus formed was filtered after cooling, washed with alcohol and ether. The resulting substance was 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride, a crystalline substance having the melting point of 285 to 2870C (with decomposition). The yield of the end product was 80%.

Example 9 2,4-dichloropyrimidine in an amount of 14.9 g and 30.2 g methyl ether of anthranilic acid were dissolved in 100 ml butanol. The mixture was heated at a temperature of 1 200C and held for 4 hours. Following this, the mixture was cooled, the formed precipitate was filtered, washed with acetone and then with either. Mehyl ester of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 hydrochloride was recrystallized from methanol. The melting point was of 254 to 255"C (with decomposition). The yield of the end product was 70%.

Example 10 Ethyl ester of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride was prepared from 14.9 g of 2,4-dichloropyrimidine and 33 g of ethyl ester of anthranilic acid using the method specified in Example 9. The melting point was of 242 to 244"C (with decomposition). The yield of the end product was 67%.

Example 11 Hydrochloride of propyl ester of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 was prepared from 14.9 g of dichloropyrimidine and 35.8 of propyl ester of anthranilic acid similarly to the method specified in Example 9. The melting point was of 233 to 2350C (with decomposition). The yield of the end product was 67%.

Example 12 Hydrochloride of isopropyl ester of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 was prepared similarly to the method specified in Example 11. The melting pointwas of 241 to 2420C (with decomposition). The yield of the end product was 65%.

Example 13 Hydrochloride of butyl ester of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 was prepared from 14.9 g of 2,4-dichloropyrimidine and 38.6 g of butyl ester of anthranilic acid using the method described above (Example 9). The melting point was of 243 to 2450C (with decomposition). The yield of the end product was 71%.

Example 14 2,4-dichloropyrimidine in an amount of 7.45 g and 13.6 g of o-aminobenzamide were dissolved in 50 ml of dimethyl formamide, and the resulting solution was heated to a temperature of 100"C. After 15 minutes, a precipitate of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 began to form. Said mixture was held at a temperature of 1 OO"C for one more hour, following which the reaction mass was cooled to the room temperature, the precipitate was filtered, washed with dimethyl formamide, and then with ether. The melting point was of 241 to 242"C (with decomposition). The yield of the end product was 80%.

Example 15 Hydrochloride of 2-(o-methylcarbamide phenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 was prepared from 7.45 g of 2,4-dichloropyrimidine and 15.0 g of o-methyl aminobenzamide according to the method specified in Example 14. The melting point was of 252 to 2530C (with decomposition). The yield of the end product was 90%.

Example 16 Hydrochloride of 2-(o-phenylcarbamide phenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 was prepared from 7.45 g of 2,4-dichloropyrimidine and 21.2 g of phenyl amide of anthranilic acid similarly to the method described in Example 14. The melting point was of 257"C (with decomposition). The yield of the end product was 60%.

Example 17 Hydrochloride of 2-(o-benzylcarbamide phenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 was formed in the interaction between 7.45 g of 2,4-dichloropyrimidine and 22.6 g of benzylamide of anthranilic acid using the method specified in Example 14. The melting point was of 254 of 255 C (with decomposition). The yield of the end product was 76%.

Example 18 Hydrochloride of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 in an amount of 3.7 g was added to 50 ml of 0.2h solution of sodium hydroxide, agitated for 5 to 10 minutes, and filtered. The precipitate left on the filter was washed with water until the filtrate was free from chiroides. The melting point was of 290"C (with decomposition). The yield of the end product was 95%.

While particular embodiments of the invention have been shown and described, various modifications thereof will be apparent to those skilled in the art and therefore it is not intended that the invention be limited to the disclosed embodiments or to the details thereof and the departures may be made therefrom within the spirit and scope of the invention as defined in the claims.

Claims (20)

1. 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6, having the structural formula

2. Derivatives of 2-(o-carboxyphenyiamino)-6H-pyrimido(2,1-b)-quinazolone-6, having the structural formula

where A+ are alkali metals, monoethanolamine, diethylamine.

3. Derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6, having the structural formula

where R is OH, alkyloxyl C 1-4, NHR where R1 is H, alkyl C 1-4, phenyl, aralkyl; A are salts of inorganic acids.

4. Derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6, having the structural formula

where R is alkyloxyl C 1-4, NHR1,where R1 is alkyl C 1-4.

5. A method of producing 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and derivatives thereof, wherein 2,4-dichloropyrimidine is brought into interaction with anthranilic acid, or a sodium salt of anthranilic acid, or substituted esters, or amides of anthranilic acid in an aqueous medium, or in an organic solvent at a temperature of 90 to 120 C, is kept at this temperature for 1 to 4 hours, and an end product is separated using a conventinal method.

6. A method of producing, as claimed in claim 5, derivatives of 2-(o-carboxyphenylamino)-6Hpyrimido(2,1-b)-quinazolone-6 as claimed in claim 2, wherein the interaction between 2,4dichloropyrimidine and a sodium salt of anthranilic acid is carried out in an aqueous medium having pH of 8.0to8.5.

7. A method of producing, as claimed in claim 5, derivatives of 2-(o-carboxyphenylamino)-6Hpyrimido(2,1-b)-quinazolone-6 as claimed in claim 3, wherein the interaction between 2,4dichloropyrimidine and substituted esters or amides of anthranilic acid is carried out at a ratio between reactive substances of 1:2 in an organic solvent.

8. A method of producing, as claimed in claim 7, derivatives of 2-(o-carboxyphenylamino)-6H pyrimido(2,1 -b)-quinazolone-6 as claimed in claim 4, wherein anions of acid of a product are additionally neutralized using conventional techniques.

9. A method as claimed in claims 5 and 7, wherein alcohols, or dimethyl formamide, or acetic acid, or mixtures thereof are used as an organic solvent.

10. A method as claimed in any of preceding claims with reference to one of given examples.

11. 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and derivatives thereof produced by a method claimed in any of claims 5 through 9.

12. A chemotherapeutic antiphlogistic containing, as an acting source, 2-(o-carboxyphenylamino)-6H- pyrimido(2,1 -b)-quinazolone-6 or derivatives thereof, and a pharmaceutical basic material.

13. A chemotherapeutical antiphlogistic as claimed in claim 12 containing, as an acting source, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6 hydrochloride in an amount of 0.25 to 0.5 g; and a pharmaceutical basic material.

14. A chemotherapeutical antiphlogistic as claimed in claim 13, wherein a pharmaceutically acceptable filler for tablets is used as a pharmaceutical basic material.

15. A chemotherapeutical anti phlogistic as claimed in claim 12, wherein it contains, as an acting source, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 hydrochloride and a pharmaceutical basic material, the ratio between ingredients being the following (percent by weight): 2-(o-carboxyphenylamino)-6H-pyrimido (2,1-b)-quinazolone-6 hydrochloride ........................ Sto 10 pharmaceutical basic material ............................................................ 90 to 95.

16. A chemotherapeutical antiphlogistic as claimed in claim 15, wherein the pharmaceutical basic material is an ointment base.

17. A chemotherapeutical antiphlogistic as claimed in claim 15, wherein the pharmaceutical basic material is a base for a paste.

18. A chemotherapeutical antiphlogistic as claimed in claim 12, wherein it contains, as an acting source, 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 hydrochloride in an amount of 0.1 to 0.5 g, and a pharmaceutical basic material.

19. A chemotherapeutical antiphlogistic as claimed in claim 18, wherein it contains a pharmaceutical filler for suppositories as a pharmaceutical basic material.

20. A chemotherapeutical anti phlogistic substantially as herein described.

The invention relates to 2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6 and its derivatives, method of producing same and application as medicinals.

2-(o-carboxyphenylamino)-6H-pyrimido(2,1-b)-quinazolone-6, having the structural formula

Derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6, having the structural formula

where A+ are alkali metals, monoethanolamine, diethylamine.

Derivatives of 2-(o-carboxyphenylamino)-6H-pyrimido(2,1 -b)-quinazolone-6, having the structural formula

where R is OH, alkyloxyl C 1-4; NHR1, where R1 is H, alkyl C 1-4, phenyl, aralkyl. A are salts of inorganic acids.