Abstract:
Novel organo-silicone compounds represented by the formula, ##STR1## wherein R is hydrogen, halogen or alkyl group, R 1 , R 2  and R 3  are alkyl group, alkoxy group, phenyl radical, substituted phenyl radical, alkylcarbonyloxy group, or trialkylsilyloxy group, respectively, R 4  is hydrogen, alkyl or alkenyl grup, and m and n are an integer, respectively but those do not represent same integer of 2, when all of R 1 , R 2  and R 3  represents methyl radical, a process for the manufacture of the compounds, and an anti-tumor agent which comprises as an effective component, at least one of the compounds.

Description:
FIELD OF THE INVENTION 
     The present invention relates to novel organo-silicone compounds, a process for the manufacture of same, and an anti-tumor agent which comprises as an effective component, at least one of the compounds. 
     RELATED ARTS 
     As silicon-containing compounds having a pharmaceutical activity of anti-tumor action, so-called &#34;Silatorane Compounds&#34; have been known, but these compounds have a disadvantage in actual or clinical use, in view of its high toxicity. 
     There is a compound of 5-fluorouracil which has actually and clinically employed as one of anti-tumor agents. This compound has an excellent anti-tumor action but shows in oral dosage a higher toxicity of that it often causes a certain trouble in digestive canals and thus this compound has exclusively been dosed through an injection route. In order to overcome this disadvantage, namely for making an oral dosage possible, 1-(2-tetrahydrofuryl)-5-fluorouracil has been developed. This compound shows a lower toxicity in oral dosage thereof, but has a disadvantage in that an anti-tumor activity thereof is low. 
     Meanwhile, in Jap. Unexamined Pat. Appln. Gazette Nos. 63 966/1981 and 38 789/1982, there are disclosed 1-[2-(2-trimethylsilylethyl)thio]ethylcarbamoyl]-5-fluorouracil and 2-[2-aminoethylthio)]ethyltrimethylsilane, respectively. These compounds have a higher anti-tumor activity but there are some doubt in an actual use thereof, since each has a higher toxicity similar to the Silatorane compounds and shows an undesirable side-reaction. 
     SUMMARY OF THE INVENTION 
     An object of the invention is to provide novel organo-silicone compounds, each having a higher anti-tumor activity and showing no or lower toxicity, particularly in oral dosage, whereby such a conflicting problem between a level on anti-tumor activity and a safety in actual use, which have been encountered in the prior anti-tumor agents, can be dissolved. 
     According to the invention, said and other objects to be appreciated by fully understanding the invention can be attained by a novel organo-silicone compound represented by the formula, ##STR2## wherein R is hydrogen, halogen or alkyl group, R 1 , R 2  and R 3  are alkyl group, alkoxy group, phenyl radical, substituted phenyl radical, alkylcarbonyloxy group or trialkylsilyloxy group, respectively, R 4  is hydrogen, alkyl or alkenyl group, and m and n are an integer, respectively but those do not represent same integer of 2, when all of R 1 , R 2  and R 3  represents methyl radical. Namely, each of the compounds shown by said Formula I shows an excellent anti-tumor activity and a quite low toxicity. 
     In the compounds shown by the Formula I, the term &#34;halogen&#34; means any of fluorine, chlorine, bromine and iodine but fluorine is most preferable. The alkyl group may be of straight-chain alkyl radicals, branched-chain alkyl radicals or cycloalkyl radicals. As examples for the straight-chain alkyl radicals, one having 1 to 10 carbon atoms, for instance methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-decyl and the like may be listed. As examples for the the branched-chain alkyl radicals, isopropyl, isobutyl, s-butyl, t-butyl, isopentyl and the like radicals may be listed. As examples for the cycloalkyl radicals, one having 3 or more carbon atoms, for instance cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and the like radicals may be listed. As the alkoxy group, methoxy, ethoxy, 2-methoxyethoxy and the like radicals may be listed. As substituents for the substituted phenyl radical, p-chloro, p-bromo, p-methyl, p-methoxy and the like may be listed. As the alkylcarbonyloxy group, acetoxy, propionyloxy and the like radicals may be listed. As the trialkylsilyloxy group, trimethylsilyloxy, triethylsilyloxy and the like radicals may be listed. As the alkenyl group, vinyl, allyl, isopropenyl and the like radicals may be listed. 
     According to a method of the invention, the compound as shown by the Formula I, can basically be prepared by reacting a compound represented by the formula. ##STR3## wherein R 1 , R 2 , R 3 , m and n have the meaning referred to, and R 5  is a radical of --N═C═O, --NHR 4  or --NR 4  --CO--Cl, in which R 4  has the meaning referred to, with a compound represented by the formula, ##STR4## wherein R has the meaning referred to, and R 6  is hydrogen, alkali metal or a radical of --COCl. 
     Referring to in more detail, the compound as shown by the Formula I can be prepared in accordance with one of the following methods. 
     (A) A method, in which a compound represented by the formula, ##STR5## wherein R 1 , R 2 , R 3 , R 4 , m and n have the meaning referred to, is reacted with 1-chloroformyl-5-substituted uracil represented by the formula, ##STR6## wherein R has the meaning referred to. 
     This reaction proceeds with by merely stirring the both raw materials in an equimolar amount, in the presence of a solvent. As the solvent, pyridine, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide, hexamethylphosphoric triamide, acetonitrile, nitromethane and the like may be used. A reaction temperature depends on kinds of the raw materials and solvent and thus it is not always in a constant level but a temperature in a range of 0° to 10° C. is preferable, since said chloroformyl compound shown by the Formula III-a is, in general, not so stable. 
     The starting material of 1-chloroformyl-5-fluorouracil can be synthesized according to the method as disclosed in &#34;Bull. Chem. Soc. Japan&#34;, Vol. 50, No. 9, Pages 2406 to 2412 (1977). 
     (B) A method, in which a compound represented by the formula ##STR7## wherein R 1 , R 2 , R 3 , R 4 , m and n have the meaning referred to, is reacted with 5-substituted uracil represented by the formula, ##STR8## wherein R has the meaning referred to, and R 7  is hydrogen or alkali metal. 
     This reaction also proceeds with by merely stirring the both raw materials in an equimolar amount, in the presence of a solvent. As the solvent, those referred to on the Method (A) may be employed. The reaction temperature depends on kinds of the raw materials and solvent but, in general, 0° to 50° C. is preferable. 
     The raw material shown by the Formula II-b can be prepared by reacting the compound shown by the Formula II-a with phosgene in an equimolar amount. In general, the reaction can conveniently proceed with by using a base in the presence of a solvent. As the base, triethylamine, pyridine, potassium carbonate or the like may be used. As the solvent, carbon tetrachloride or the like halogenated carbons, ethyl ether, tetrahydrofuran, dioxane or the like ethers, benzene, toluene, xylene or the like aromatic hydrocarbons may be employed. The reaction temperature depends on kinds of the raw material and solvent and thus it is not always in a constant level but, in general, a temperature of 0° to 20° C. is selected. The resulting carbamoylchloride shown by the Formula II-b can be used for the reaction with the compound shown by the Formula III-b, without any purifying procedure. 
     (C) The compounds shown by the Formula I, wherein R 4  is hydrogen, namely those represented by the formula, ##STR9## wherein R, R 1 , R 2 , R 3 , m and n have the meaning referred to, can also be prepared by reacting an isocyanate represented by the formula, ##STR10## wherein R 1 , R 2 , R 3 , m and n have the meaning referred to, with 5-substituted uracil represented by the formula, ##STR11## wherein R has the meaning referred to. 
     This reaction also proceeds with by merely stirring the both raw materials in an equimolar amount, in the presence of a solvent. As the solvent, those referred to on the Method (A) can be employed. The reaction temperature depends on kinds of the raw materials and solvent and thus it is not always in a constant level but, in general, a temperature of 0° to 100° C. is selected. 
     The raw material shown by the Formula II-c can be prepared by reacting the compound shown by the Formula II-a with phosgene in 1.0 to 3.0 times molar amount. This reaction, in general, proceeds with by merely stirring the reactants in the presence of a solvent. As the solvent, benzene, toluene, xylene or the like aromatic hydrocarbon can be employed. The reaction temperature depends on kinds of the raw material and solvent but a temperature of 0° C. to a boiling point of the solvent is usually selected. 
     EFFECT OF THE INVENTION 
     Novel organo-silicone compounds according to the invention has an anti-tumor activity and more particularly an inhibiting action to various solid tumors and shows no or quite low toxicity in both of oral and non-oral dosage thereof. Therefore, it can be used as a safety effective component for anti-tumor agents. 
     FORM AND DOSING AMOUNT 
     Each of the compounds according to the invention can be dosed in both of oral and non-oral routes. For the oral dosage, the compound may be made with conventional additives or carriers into a tablet, capsule, granule or other form. For the non-oral dosage, the compound may be made with conventional additives or carriers into an injection, suppository or the like form. 
     A dosing amount of the compound for human depends on kind of the compound to be used, condition of illness, age of a patient, form of the medicine and other factors but in case for an adult, 300 to 5000 mg/day on oral dosage and 100 to 2000 mg/day on suppository are preferable. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The invention will now be explained with reference to Examples and Pharmaceutical Test Examples. 
     EXAMPLE 1 
     5-Fluoro-3,4-dihydro-2,4-dioxo-N-[2-[[3-(trimethylsilyl)propyl]thio]ethyl]-1(2H)-pyrimidinecarboxamide 
     Trichloromethyl chloroformate (9.90 g, 50.0 mmol) was added dropwise with stirring to a mixture of 5-fluoro-2,4(1H,3H)-pyrimidinedione (13.0 g, 0.100 mol) and active carbon (3.0 g) in 400 ml of dry pyridine, while the temperature was maintained at 5° C. 
     After stirring for one hour, the unreactive phosgene was removed in vacuo at 5° C. 
     Then, to the reaction mixture 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine (9.57 g, 50.0 mmol) was added dropwise at 10° C. under argon atmosphere, and stirred for one hour. The reaction mixture was evaporated to dryness in vacuo, the resulting residue was dissolved in ethyl acetate (400 ml) and then the active carbon was filtered off, the filtrate was washed with 3% hydrochloric acid (300 ml) and then with warm (500 ml). The organic phase was dried over sodium sulfate and the solvent was evaporated to dryness in vacuo. 
     The crude crystalline was recrystalized from ethyl ether to yield the desired compound (15.7 g, 90.7%). 
     Melting point: 109°-110° C. 
     Elementary analysis: C 13  H 22  FN 3  O 3  SSi. Cal.: C, 44.94; H, 6.38; N, 12.09. Found: C, 44.75; H, 6.47; N, 11.99. 
     IR (ν max   KBr ) cm -1  : 3300 (ν NH ), 2960, 2920(ν CH ), 1740, 1700(ν C ═O), 1525(δ NH ), 1250 (ν C-Si ) 
       1  H-NMR (CDCl 3 ) δppm: ##STR12## 
     MS (EI/DI) m/z: 347 (M + ), 332, 202, 73(base peak). 
     EXAMPLE 2 
     5-Fluoro-3,4-dihydro-2,4-dioxo-N-[2-[[(2-triethylsilyl)ethyl]thio]ethyl]-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for the treatment with 2-[[2-(triethylsilyl)ethyl]thio]ethyl amine (11.0 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether to yield the desired compound (17.5 g, 93.2%). 
     Melting point: 76° C. 
     Elementary analysis: C 15  H 26  FN 3  O 3  SSi. Cal.: C, 47.97; H, 6.98; N, 11.19. Found: C, 47.67; H, 7.22; N, 11.17. 
     IR (ν max   KBr ) cm -1  : 3320(ν NH ), 2950(ν CH ), 1740, 1700(ν C ═O), 1525(δ NH ), 1230(ν C-Si ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR13## 
     MS (EI/DI) m/z: 216, 188(base peak). 
     EXAMPLE 3 
     N-[2-[[2-(Dimethylphenylsilyl)ethyl]thio]ethyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 2-[[2-(dimethylphenylsilyl)ethyl]thio]ethyl amine (10.8 g, 45.0 mmol) instead of 2-[[3-trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether to yield the desired compound (15.5 g, 87.3%). 
     Melting point: 90°-91° C. 
     Elementary analysis: C 15  H 26  FN 3  O 3  SSi. Cal.: C, 51.62; H, 5.61; N, 10.62. Found: C, 51.66; H, 5.71; N, 10.54. 
     IR (ν max   KBr ) cm -1  : 3350, 3310 (ν NH ), 2960, 2930(ν CH ), 1735(ν C ═O), 1505(δ NH ). ##STR14## 
     FD-MS m/z: 395(M+, base peak). 
     EXAMPLE 4 
     N-[2-[[2-(Dimethyloctylsilyl)ethyl]thio]ethyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 2-[[2-(dimethyloctylsilyl)ethyl]thio]ethyl amine (13.8 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (17.1 g, 79.1%). 
     Melting point: 60°-61° C. 
     Elementary analysis: C 19  H 31  FN 3  O 3  SSi. Cal.: C, 52,87; H, 7.94; N, 9.74. Found: C, 52.63; H, 8.26; N, 9.71. 
     IR (ν max   KBr ) cm -1  : 3430(ν NH ), 2930, 2860(ν CH ), 1735(ν C ═O), 1530(δ NH ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR15## 
     MS (EI/DI) m/z: 188, 160(base peak) 
     EXAMPLE 5 
     5-Fluoro-3,4-dihydro-N-[2-[[2-(isopropyldimethylsilyl)ethyl]thio]ethyl]-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedureas in the case of Example 1, except for treatment with 2-[[2-(isopropyldimethylsilyl)ethyl]thio]ethyl amine (10.3 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (16.8 g, 93.0%). 
     Melting point: 85°-86° C. 
     Elementary analysis: C 14  H 24  FN 3  O 3  SSi. Cal.: C, 46.51; H, 6.69; N, 11.62. Found: C, 46.34; H, 6.87; N, 11.63. 
     IR (ν max   KBr ) cm -1  : 3420(ν NH ), 2960(ν CH ), 1725, 1690(ν C ═O), 1525(δ NH ), 1250(ν C-Si ). 
       1  N-NMR (CDCl 3 ) δppm: ##STR16## 
     FD-MS m/z: 361(M + ), 318(base peak). 
     EXAMPLE 6 
     N-[2-[[2-(Butyldimethylsilyl)ethyl]thio]ethyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 2-[[2-(butyldimethylsilyl)ethyl]thio]ethyl amine (11.0 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from methanol to yield the desired compound (17.2 g, 91.5%). 
     Melting point: 71°-72° C. 
     Elementary analysis: C 15  H 26  FN 3  O 3  SSi. Cal.: C, 47.98; H, 6.98; N, 11.19. Found: C, 47.63; H, 7.14; N, 11.14. 
     IR (ν max   KBr ) cm -1  : 3300(ν NH ), 2960, 2920(ν CH ), 1735(ν C ═O), 1520(δ NH ). 1250(ν C-Si ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR17## 
     FAB-MS m/z: 376[(M+1) +  ]. 
     Example 7 
     5-Fluoro-3,4-dihydro-N-[2-[[2-(methyldiphenylsilyl)ethyl]thio]ethyl]-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 2-[[2-(methyldiphenylsilyl)ethyl]thio]ethyl amine (12.0 g, 40.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from methanol to yield the desired compound (12.6 g, 69.0%). 
     Melting point: 119°-120° C. 
     Elementary analysis: C 22  H 24  FN 3  O 3  SSi. Cal.: C, 57.75; H, 5.29; N, 9.18. Found: C, 57.51; H, 5.32; N, 9.06. 
     IR (ν max   KBr ) cm -1  : 3430(ν NH ), 2840(ν CH ), 1740(ν C ═O), 1520(δ NH ), 1235(ν C-Si ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR18## 
     MS (EI/DI) m/z: 327, 285, 197(base peak). 
     Example 8 
     5-Fluoro-3,4-dihydro-2,4-dioxo-N-[3-[[2-(trimethylsilyl)ethyl]thio]propyl]-1-(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[2-(trimethylsilyl)ethyl]thio]propyl amine (9.55 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (13.3 g, 76.4%). 
     Melting point: 114°-115° C. 
     Elementary analysis: C 13  H 22  FN 3  O 3  SSi. Cal.: C, 44.94; H, 6.38; N, 12.09. Found: C, 44.87; H, 6.55; N, 12.11. 
     IR (ν max   KBr ) cm -1  : 3330(ν NH ), 2960(ν CH ), 1740(ν C ═O), 1505(δ NH ), 1250(νC-Si). 
       1  H-NMR (CDCl 3 ) δppm: ##STR19## 
     MS (EI/DI) m/z: 347(M + ), 305, 73(base peak). 
     Example 9 
     5-Fluoro-3,4-dihydro-N-[3-[[2-(isopropyldimethylsilyl)ethyl]thio]propyl]-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[2-(isopropyldimethylsilyl)ethyl]thio]propyl amine (11.0 g, 50.0 mmol) instead of 1-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether to yield the desired compound (17.3 g, 92.0%). 
     Melting point: 122°-123° C. 
     Elementary analysis: C 15  H 26  FN 3  O 3  SSi. Cal.: C, 47.98; H, 6.98; N, 11.19. Found: C, 48.16; H, 7.10; N, 11.40. 
     IR (ν max   KBr ) cm -1  : 3330(ν NH ), 2950(ν CH ), 1735, 1660(ν C ═O), 1250(ν C-Si ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR20## 
     FD-MS m/z: 375(M + ), 332(base peak). 
     Example 10 
     5-Fluoro-3,4-dihydro-2,4-dioxo-N-[3-[[3-(trimethylsilyl)propyl]thio]propyl]-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[3-(trimethylsilyl)propyl]thio]propyl amine (10.3 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (16.6 g, 92.0%). 
     Melting point: 105°-106° C. 
     Elementary analysis: C 14  H 24  FN 3  O 3  SSi. Cal.: C, 46.51; H, 6.69; N, 11.62. Found: C, 46.80; H, 6.71; N, 11.74. 
     IR (ν max   KBr ) cm -1  : 3330(ν NH ), 2960(ν CH ), 1735, 1670(ν C ═O), 1250(ν C-Si ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR21## 
     FD-MS m/z: 361(M + ), 73(base peak). 
     Example 11 
     5-Fluoro-3,4-dihydro-N-[3-[[3-(isopropyldimethylsilyl)propyl]thio]propyl]-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[3-(isopropyldimethylsilyl)propyl]thio]propyl amine (11.7 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (16.4 g, 84.3%). 
     Melting point: 101°-102° C. 
     Elementary analysis: C 16  H 28  FN 3  O 3  SSi. Cal.: C, 49.33; H, 7.24; N, 10.79. Found: C, 49.52; H, 7.10; N, 10.60. 
     IR (ν max   KBr ) cm -1  : 3330(ν NH ), 2950(ν CH ), 1720(ν C ═O), 1670(ν CONH ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR22## 
     FD-MS m/z: 346(base peak) 
     Example 12 
     5-Fluoro-3,4-dihydro-N-[2-[[3-(isopropyldimethylsilyl)propyl]thio]ethyl]-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 2-[[3-(isopropyldimethylsilyl)propyl]thio]ethyl amine (11.0 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether to yield the desired compound (16.7 g, 89.0%). 
     Melting point: 113°-114° C. 
     Elementary analysis: C 15  H 26  FN 3  O 3  SSi. Cal.: C, 47.98; H, 6.98; N, 11.19. Found: C, 48.15; H, 7.11; N, 11.00. 
     IR (ν max   KBr ) cm -1  : 3330(νNH), 2950(ν CH ), 1750(ν C ═O), 1680(ν CONH ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR23## 
     Example 13 
     N-[2-[[3-(t-Butyldimethylsilyl)propyl]thio]ethyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 2-[[3-(butyldimethylsilyl)propyl]thio]ethyl amine (11.7 g, 50.0 mmol) instead of 2-[[3-trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether to yield the desired compound (18.4 g, 94.5%). 
     Melting point: 123°-124° C. 
     Elementary analysis: C 16  H 28  FN 3  O 3  SSi. 
     Cal.: C, 49.33; H, 7.24; N, 10.79. Found: C, 49.50; H, 7.44; N, 10.72. 
     IR (ν max   KBr ) cm -1  : 3330(ν NH ), 2850, 2830(ν CH ), 1735(ν C ═O), 1680(ν CONH ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR24## 
     Example 14 
     N-[3-[[3-(t-Butyldimethylsilyl)propyl]thio]propyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[3-(t-butyl-dimethylsilyl)propyl]thio]propyl amine (12.4 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (18.4 g, 91.4%). 
     Melting point: 102°-103° C. 
     Elementary analysis: C 17  H 30  FN 3  O 3  SSi. Cal.: C, 50.59; H, 7.49; N, 10.41. Found: C, 50.34; H, 7.66; N, 10.45. 
     IR (ν max   KBr ) cm -1  : 3350(ν NH ), 3080, 2960, 2940, 2860(ν CH ), 1730(ν C ═O), 1670(ν CONH ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR25## 
     MS (EI/DI) m/z: 216(base peak). 
     Example 15 
     N-[3-[[3-(Butyldimethylsilyl)propyl]thio]propyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[3-(butyldimethylsilyl)propyl]thio]propyl amine (12.4 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (19.3 g, 95.7%). 
     Melting point: 71°-72° C. 
     Elementary analysis: C 17  H 30  FN 3  O 3  SSi. Cal.: C, 50.59; H, 7.49; N, 10.41. Found: C, 51.10; H, 7.88; N, 10.44. 
       1  H-NMR (CDCl 3 ) δppm: ##STR26## 
     MS (EI/DI) m/z: 258, 216(base peak). 
     Example 16 
     N-[3-[[3-(Dimethylphenylsilyl)propyl]thio]propyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3[[3-(dimethylphenylsilyl)propyl]thio]propyl amine (13.4 g, 50.0 mmol) instead of 2-[[3-(trimethyl-silyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether-n-hexane to yield the desired compound (19.8 g, 93.2%). 
     Melting point: 51°-52° C. 
     Elementary analysis: C 19  H 26  FN 3  O 3  SSi. Cal.: C, 53.88; H, 6.19; N, 9.92. Found: C, 54.57; H, 6.49; N, 9.79. 
     IR (ν max   KBr ) cm -1  : 3350(ν NH ), 3080, 2960, 2930(ν CH ), 1735(ν C ═O), 1690(ν CONH ). 
       1  H-NMR (CDCl 3 ) Δ ppm: 
     
         ______________________________________0.22      ##STR27##0.65-1.05      ##STR28##1.22-2.08      ##STR29##2.35-2.72      ##STR30##3.28-3.72      ##STR31##7.18-7.62      ##STR32##8.44      (1H, d, J=7.0 Hz, C.sub.6 --H)9.05      (2H, br., 2 × NH)______________________________________ 
    
     MS (EI/DI) m/z: 278, 137(base peak). 
     Example 17 
     N-[3-[[2-(Butyldimethylsilyl)ethyl]thio]propyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[2-(butyldimethylsilyl)ethyl]thio]propyl amine (11.7 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from n-propanol to yield the desired compound (11.9 g, 61.2%). 
     Melting point: 83.5°-84° C. 
     Elementary analysis: C 16  H 28  FN 3  O 3  SSi. Cal.: C, 49.33; H, 7.24; N, 10.79. Found: C, 49.36; H, 7.41; N, 10.87. 
     IR (ν max   KBr ) cm -1  : 3340(ν NH ), 3090, 2930(ν CH ), 1740(ν C ═O), 1690(ν CONH ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR33## 
     FAB-MS m/z: 390[(M+1) +  ]. 
     Example 18 
     N-[3-[[2-(Dimethylphenylsilyl)ethyl]thio]propyl]-5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinecarboxamide 
     This compound was prepared by the similar procedure as in the case of Example 1, except for treatment with 3-[[2-(dimethylphenylsilyl)ethyl]thio]propyl amine (12.7 g, 50.0 mmol) instead of 2-[[3-(trimethylsilyl)propyl]thio]ethyl amine. The crude material was recrystalized from ethyl ether to yield the desired compound (15.1 g, 73.7%). 
     Melting point: 93.5°-94° C. 
     Elementary analysis: C 18  H 24  FN 3  O 3  SSi. Cal.: C, 52.79; H, 5.91; N, 10.26. Found: C, 52.88; H, 6.20; N, 10.37. 
     IR (ν max   KBr ) cm -1  : 3320(ν NH ), 3060, 2960, 2840(ν CH ), 1745(ν C ═O), 1690(ν CONH ). 
       1  H-NMR (CDCl 3 ) δppm: ##STR34## 
     FAB-MS m/z: 410[(M+l) +  ]. 
     PHARMACOLOGICAL TEST EXAMPLE 1 
     (Suppression of KB cell proliferation in vitro) 
     In a cultivation device (5% CO 2 , 37° C.), KB cells (1×10 4  cells) were cultivated for 24 hours in a culture tube with 1 ml of Eagle culture medium added 10% ox serum, the used culture medium was thrown away to change with a fresh culture medium (0.9 ml), and then 0.1 ml of a similar culture fluid containing each testing compound prepared by the process as described in the Examples was added to cultivate the same for further 3 days. Thereafter, living cells were dyed with Tripan Blue and measured same through a dye-exclusion method. 
     A control was treated in a manner similar to the above, except that a culture fluid containing no compound of the invention was added. 
     50% inhibition density (IC 50 ) to the tumor cell proliferation was decided through the tests between the testing group and the control group to obtain results as shown in following Table 1. 
     
                       TABLE 1______________________________________            KBCompound (Example)            IC.sub.50, μg/ml______________________________________1                202                133                124                205                 46                127                 48                 79                1510               1011               1312               1513               13______________________________________ 
    
     PHARMACOLOGICAL TEST EXAMPLE 2 
     (Anti-tumor action to L-1210 leukemia) 
     L-1210 leukemia cell (1×10 5  cells) was transplanted in a abdominal cavity of BDF 1  female mice (20-21 g, age of about 5 weeks), and each of testing compounds was orally dosed in 250 mg/kg or 500 mg/kg at 1st, 5th and 9th day after the transplantation to check days of life of the mice. Results are shown in the following Table 2. ##EQU1## 
     
                       TABLE 2______________________________________Compound  Dosage/day × 3                  L-1210(Example) (mg/kg)      ILS (%)    Judgement*______________________________________1         250          28         +     500          98         ++2         250          19         -     500          96         ++3         250          38         +     500          82         ++4         250          12         -     500          38         +5         250          51         +     500          106        +++6         250          35         +     500          73         ++7         250          11         -     500          11         -8         250          27         +     500          70         ++9         250          45         +     500          80         ++10        250          49         +     500          111        +++11        250          18         -     500          81         ++12        250          24         -     500          70         ++13        250          10         -     500          67         ++14        250          19         -     500          68         ++15        250          26         +     500          62         ++16        250          23         -     500          86         ++______________________________________ *-: 25 &gt; ILS +: 25 ≦ ILS &lt; 50 ++: 50 ≦ ILS &lt; 100 +++: 100 ≦ ILS 
    
     PHARMACOLOGICAL TEST EXAMPLE 3 
     (Anti-tumor action to Colon-38 carcinoma) 
     0.02 ml of 10(W/V)% cell suspension prepared from a solid cancer cell (Colon-38 carcinoma) were transplanted under skin of BDF 1  mice (20-21 g, age of about 5 weeks), and each of testing compounds was orally dosed to the mice at 1st, 5th and 9th day after the transplantation. A major and minor axes of the cancerous tumor were measured at 11th, 14th, 21st, 25th and 28th day after the transplantation to calcurate volume of the tumor in accordance with the following. 
     
         1/2L×W.sup.2 
    
     L: major axis (mm) 
     W: minor axis (mm) 
     At 28th day from the transplantation, the mice were killed and each of the cancerous tumors was extracted to measure its weight and to determine an inhibitation ratio in comparison with a non-treated control group. 
     Results were shown in following Table 3. 
     
                       TABLE 3______________________________________Compound   Dosage/day × 3                   colon-38(Example)  (mg/kg)      Inhibition ratio (%)______________________________________ 1         278          95.2 2         300          71.9 3         315          82.1 4         345          80.0 5         289          89.8 6         300          81.2 7         366          32.2 8         278          78.0 9         338          98.410         289          89.511         350          90.312         338          97.313         311          81.014         323          90.115         323          92.316         339          97.917         312          97.418         328          71.3______________________________________ 
    
     PHARMACOLOGICAL TEST EXAMPLE 4 
     (Anti-tumor action to MM-46 adenocarcinoma) 
     MM-46 adenocarcinoma (1×10 6  cells) was transplanted under skin of C3H/He female mice (age of about 5 weeks), and each of testing compounds was orally dosed at 1st, 5th and 9th day after the transplantation to check days of life on the mice. 
     Results were shown in following Table 4. 
     In the Table, 
     T: days to death on testing group, and 
     C: days to death on control group. 
     
                       TABLE 4______________________________________Compound  Dosage/day × 3                  MM-46 adenocarcinoma(Example) (mg/kg)      T/C × 100 (%)______________________________________1         250          1813         250          2055         250          162______________________________________ 
    
     PHARMACOLOGICAL TEST EXAMPLE 5 
     (Anti-tumor action to B-16 melanoma) 
     B-16 melanoma (1×10 5  cells) was transplanted under skin of BDF 1  female mice (age of about 5 weeks), and each of testing compounds was orally dosed at 1st, 5th and 9th day after the transplantation. At 21st day after the transplantation, the mice were killed to measure a weight of the cancerous tumor and to finally determine an inhibition ratio. 
     Results were shown in following Table 5. 
     
                       TABLE 5______________________________________Compound   Dosage/day × 3                   B-16 melanoma(Example)  mg/kg        Inhibition ratio (%)______________________________________ 1         250          73.8      125          25.8 2         300          47.2 3         300          62.0 5         300          79.7 6         300          53.5 8         250          4.3 9         250          19.4      125          17.610         250          15.2      125          38.111         250          45.7      125          32.812         250          37.9      125          34.213         250          43.1      125          38.014         250          46.3      125          55.215         250          88.5      125          69.516         250          70.5      125          82.217         400          34.8      200          16.3      100          54.318         400          29.6      200          46.7      100          55.2______________________________________ 
    
     PHARMACOLOGICAL TEST EXAMPLE 6 
     (Anti-tumor action to Lewis lung carcinoma) 
     Lewis lung carcinoma (1×10 5  cells) was transplanted under skin of right ear of BDF 1  mice (age of about 5 weeks), and each of testing compounds was orally dosed 10 times from 1st to 10th day after the transplantation. At 21st day after the transplantation, the mice were killed to measure a weight of the primarly tumor and to extract a lung. The lung was fixed in a conventional manner to count a number of metastasis on cancerous cells with use of a stereomicroscope having a low magnification. An anti-tumor action of each compound was expressed with an inhibition in weight of the primarly tumor and an inhibition of the metastasis. 
     Results were shown in following Table 6. 
     
                       TABLE 6______________________________________           Inhibition RatioCompound   Dosage/day × 10                  weight(Example)   (mg/kg)        LLC (%)  metastasis (%)______________________________________1       13             0.0      50.9   13 + Amputation                  33.2     (26.6)   26 + Amputation                  59.8     (&gt;63.0)   26             51.1     79.2   52             31.1     95.72       14             0.0      45.23       29.5           20.7     57.5   59             0.0      95.14       32             4.6      76.2   64             18.0     97.55       13.5           0.0      19.3   13.5 + Amputation                  34.7     (15.4)   27 + Amputation                  35.8     (&gt;39.5)   27             7.1      78.4   54             34.9     83.06       13.5 + Amputation                  37.3     (18.3)   27 + Amputation                  30.9     (23.1)   27             39.6     92.6   54             38.0     95.17       34             31.0     67.1   68             25.0     87.78       13             0.0      53.0   13 + Amputation                  33.3     (18.4)   26             26.2     92.5   26 + Amputation                  64.9     (33.6)______________________________________ 
    
     PHARMACOLOGICAL TEST EXAMPLE 7 
     (Acute toxicity) 
     Each of testing compounds suspended in 0.1% P-1570 was orally and forcedly dosed through a gastric probe to CrJ/CDI female mice (21 to 22 g, age of about 5 weeks). An identification number was given to each mouse, and a weighing and observation on general behavior were carried out just before the dosage and each day after the same. Each of died mice was subjected without delay to an autopsy to check the same, more particularly in detail on enterona. All of living mice were killed at 21st day from the dosage to carry out an autopsy for checking the same, more particularly on entrails. 
     An LD 50  was calculated in accordance with the Leed and Munch&#39;s method. 
     A similar test was carried out on each controls of 1-[2-[(2-trimethylsilylethyl)thio]ethylcarbamoyl]-5-fluorouracil and 1-hexylcarbamoyl-5-fluorouracil (HCFU) which is one of exemplary anti-tumor agents. On the former control compound, a spasm was observed in some mice and an opinion on autopsy of the concerned mice showed an ulcer and laxative feces, none of which was recognized through an autopsy for the mice having dosed the compound according to the invention. 
     Results were shown in following Table 7. 
     
                       TABLE 7______________________________________Compounds           LD.sub.50 (mg/kg)______________________________________Examples 1                  1575 2                  1545 3                  1500 4                  1580 5                  1380 6                  1385 7                  1400 8                  1355 9                  225010                  217011                  212013                  138014                  180015                  185016                  1800Controls1-[2-[(2-trimethylsilylethyl)thio]-               1095ethylcarbamoyl]-5-fluorouracilHCFU                1250______________________________________ 
    
     PRESCRIPTIONAL EXAMPLE 1 
     (Tablet) 
     Following components were mixed to prepare tablets in a conventional manner. 
     
         ______________________________________Compound of Example 1            100        (mg)Crystalline cellulose            20Lactose          41Corn starch      30Hydroxypropylcellulose            6Magnesium stearate            3            200        mg/tablet______________________________________ 
    
     PRESCRIPTIONAL EXAMPLE 2 
     (Capsule) 
     Following components were mixed and charged in capsules in a conventional manner to prepare capsuled pharmaceutical agents. 
     
         ______________________________________Compound of Example 5            200        (mg)Crystalline cellulose            50Silicic anhydride            2Magnesium stearate            3            255        mg/capsule______________________________________ 
    
     PRESCRIPTIONAL EXAMPLE 3 
     (Granule) 
     Following components were mixed and packed in a conventional manner to prepare granular pharmaceutical agents. 
     
         ______________________________________Compound of Example 8            500       (mg)Lactose          323Corn starch      150Polyvinylpyrrolidone            25Silicic anhydride            2            1000      mg/package______________________________________ 
    
     PRESCRIPTIONAL EXAMPLE 4 
     (Suppository) 
     Following components were mixed to prepare suppositories in a conventional manner. 
     
         ______________________________________Compound of Example 10            300       (mg)Witep-Sol W-35   1700            2000      mg/suppository______________________________________