反应详情

3-Cyano-6-isopropyl-2(1H)-pyridinone: A solution of 3-cyano-6-methyl-2(1H)-pyridinone (10.0 g, 74.6 mmol) in anhydrous tetrahydrofuran (100 mL) was cooled to −78° C. under nitrogen and reacted slowly with lithium diisopropylamide solution (40 mL of 1.4 M and 85 mL of 2.0 M, 226 mmol total) via syringe. After warming to 0° C. and stirring 2 hours, methyl iodide (10 mL, 160 mmol) was added and the reaction stirred 18 hours at ambient temperature. The reaction was poured into 0.67 N NaOH (300 mL), the phases separated, the aqueous layer washed with diethyl ether, and the combined organic layers extracted with water. The combined aqueous layers were acidified to pH 4 with 6 N HCl and extracted with methylene chloride, and the methylene chloride layer was washed with brine, dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo and the residue purified by flash column chromatography (1:1 methylene chloride:ethyl acetate) giving the title compound as a light yellow solid (2.15 g, 18%). 1H NMR (300 Hz, CDCl3) δ 13.25 (br s, 1H), 7.84 (d, 1H, J=7.5 Hz), 6.23 (d, 1H, J=7.5 Hz), 3.00 (septet, 1H, J=7.0 Hz), 1,36 (s, 3H), 1.34 (s, 3H). Also recovered from the column was the mono-methylated side-product 3-cyano-6-ethyl-2(1H)pyridinone (5.50 g, 50%). which was used to make the title compound in Example 97. 1H NMR (300 MHz, CDCl3) δ 7.84 (d, J=7.5 Hz, 1H), 6.23 (d, J=7.4 Hz, 1H), 2.76 (q, J=7.6 Hz, 2H), 1.35 (t, J=7.5 Hz, 3H). 2. 3-Carboxy-6-isopropyl-2(1H)-pyridinone: 3-Cyano-6-isopropyl-2(1 H)-pyridinone (2.92 g, 18.0 mmol), as prepared in the preceding step, was dissolved in hot 50% v/v sulfuric acid (45 mL) and refluxed for 3 hours. After cooling to ambient temperature, the reaction mixture was poured into 200 mL of ice water and the resulting precipitate collected by filtration, washed with water, then air and vacuum dried giving the title compound (2.83 g, 87%) as a white solid. 1H NMR (300 MHz, CDCl3) δ 13.67 (s, 1H), 12.75 (br s, 1H), 8.56 (d, 1H, J=7.5 Hz), 6.56 (dd, 1H, J=7.6 Hz, 1.6 Hz), 3.02 (septet, 1H, J=6.9 Hz), 1.41 (s, 3H), 1.39 (s, 3H). 3. 3-(Benzyloxycarbonyl)amino-6-isopropyl-2(1H)-pyridinone: 3-Carboxy-6-isopropyl-2(1H)-pyridinone (2.82 g, 15.6 mmol), as prepared in the preceding step, diphenylphosphoryl azide (3.50 mL, 16.2 mmol), and triethylamine (2.30 mL, 16.5 mmol) were refluxed in 1,4dioxane (100 mL) for 16 hours. Benzyl alcohol (1.65 mL, 15.9 mmol) and additional triethylamine (2.40 mL, 17.2 mmol) were added and the reaction refluxed another 24 hours. After concentrating the reaction mixture in vacuo, the residue was dissolved in methylene chloride, washed with pH 1 brine, saturated NaHCO3, and pH 7 brine, dried over MgSO4, and filtered. The evaporated filtrate was then purified by flash column chromatography (gradient elution, 10% to 25% ethyl acetate in methylene chloride) giving the title compound as a light yellow solid (1.10 g, 25%). 1H NMR (300 MHz, CDCl3) δ 11.61 (br s, 1H), 8.05 (br d, 1H, J=7.2 Hz), 7.67 (s, 1H), 7.39 (m, 5H), 6.08 (d, 1H, J=7.7 Hz), 5.21 (s, 2H), 2.80 (septet, 1H, J=6.9 Hz), 1.28 (s, 3H), 1.26 (s, 3H). 4. 3-(Benzyloxycarbonyl)amino-6-isopropyl-1-(tert-butoxycarbonylmethyl)-2pyridinone: 3-(Benzyloxycarbonyl)amino-6-isopropyl-2(1H)-pyridinone (1.10 g, 3.84 mmol), as prepared in the preceding step, was dissolved in anhydrous tetrahydrofuran (30 mL) and cooled to 0° C. under nitrogen. A 1.0 M solution of lithium bis(trimethylsilyl)amide in hexanes (4.2 mL, 4.2 mmol) was added via syringe and the reaction stirred for one hour. tert-Butylbromoacetate (0.70 mL, 4.3 mmol) was then added via syringe and the reaction stirred at ambient temperature for 16 hours. After concentration in vacuo, the crude product was purified by flash column chromatography (1:1 hexane:ethyl acetate) giving the title compound as a pale yellow oil (1.38 g, 90%). 1H NMR (300 MHz, CDCl3) δ 8.00 (br d, 1H, J=7.8 Hz), 7.78 (s, 1H), 7.36 (m, 5H), 6.15 (d, 1H, J=7.9 Hz), 5.19 (s, 2H), 4.79 (s, 2H), 2.72 (m, 1H), 1.46 (s, 9H), 1.26 (s, 3H), 1.23 (s, 3H). Mass spectrum (MALDI-TOF, gentisic acid matrix) calcd. for C22H28N2O5: 423.2 (M+Na). Found: 423.6. 5. 3-Amino-6-isopropyl-1-(tert-butoxycarbonylmethyl)-2-pyridinone: 3-(Benzyloxycarbonyl)amino-6-isopropyl-1-(tert-butoxycarbonylmethyl)-2-pyridinone (1.35, 3.37 mmol), as prepared in the preceding step, and 10% palladium (0) on activated carbon (0.12 g) were dissolved in methanol (50 mL), degassed, backfilled with nitrogen, and stirred under hydrogen gas at ambient pressure and temperature for 2 hours. The reaction mixture was then filtered through Celite and the filtrate evaporated giving the title compound as a golden oil, which was used without further purification. 6. 3-(3-Methylphenylsulfonyl)amino-6-isopropyl-1-(tert-butoxycarbonylmethyl)-2-pyridinone: 3-Amino-6-isopropyl-1-(tert-butoxycarbonylmethyl)-2-pyridinone (assumed to be 3.37 mmol), as prepared in the preceding step, and N-methylmorpholine (1.0 mL, 9.1 mmol) were dissolved in methylene chloride (20 mL) and cooled to 0° C. A solution of m-toluenesulfonyl chloride (0.67 g, 3.5 mmol) in methylene chloride (5 mL) was added and the reaction stirred at ambient temperature for 16 hours. After evaporation in vacuo, the crude product was dissolved in methylene chloride, washed with 10% aqueous citric acid, saturated NaHCO3, and brine, dried over MgSO4, and filtered. The evaporated filtrate gave the title compound (1.24 g, 88%) as a tan solid. 1H NMR (300 MHz, CDCl3) δ 7.65 (m, 2H), 7.58 (br s, 1H), 7.46 (d, 1H, J=7.8 Hz), 7.33 (m, 2H), 6.08 (d, 1H, J=7.9 Hz), 4.69 (s, 2H), 2.67 (m, 1H), 2.38 (s, 3H), 1.41 (s, 9H), 1.22 (s, 3H), 1.19 (s, 3H). 7. 3-(3-Methylphenylsulfonyl)amino-6-isopropyl-1-(carboxymethyl)-2-pyridinone: 3-(3-Methylphenylsulfonyl)amino-6-isopropyl-1-(tert-butoxycarbonylmethyl)-2-pyridinone (1.24 g, 2.95 mmol), as prepared in the preceding step, was dissolved in methylene chloride (20 mL) and reacted with trifluoroacetic acid (8 mL) at ambient temperature for 2 hours. After evaporation in vacuo, the crude product was dissolved in methylene chloride, washed with pH 7 buffer and brine, dried over MgSO4, and filtered. Evaporation of the filtrate gave the title compound (0.72 g, 67%) as a light yellow solid. Mass spectrum (LCMS, ESI) calcd. for C17H20N2O5S: 365.4 (M+H). Found: 365.1. 8. 3-(3-Methylphenylsulfonyl)amino-6-isopropyl-1-{[N,N′-di(tert-butoxycarbonyl)]-2-(guanidinyloxyethyl)aminocabonylmethyl}-2-pyridinone: 3-(3-Methylphenylsulfonyl)amino-6-isopropyl-1-(carboxymethyl)-2-pyridinone (0.71 g, 1.95 mmol), as prepared in the preceding step, Castro's reagent (BOP, 0.905 g, 2.05 (mmol), and [N,N′-di(tert-butoxycarbonyl)] 2-aminoethoxyguanidine (0.710 g, 2.00 mmol), as prepared in step 4 of Example 2, were dissolved in methylene chloride (40 mL) and reacted with triethylamine (0.75 mL, 5.4 mmol) at ambient temperature for 3 days. After concentration in vacuo, the crude product was dissolved in methylene chloride, washed with 10% aqueous citric acid, saturated NaHCO3, and brine, dried over Na2SO4, and filtered. The evaporated filtrate was purified by flash column chromatography (5% methanol in methylene chloride) giving the title compound as a light yellow solid (0.70 g, 54%). 1H NMR (300 MHz, CDCl3) δ 9.15 (s, 1H), 8.34 (br t, 1H, J=5.0 Hz), 7.67 (m, 3H), 7.59 (s, 1H), 7.40 (d, 1H, J=7.9 Hz), 7,34 (m, 2H), 6.06 (d, 1H, J=7.9 Hz), 4.86 (s, 2H), 4.09 (m, 2H), 3.58 (dd, 2H, J=8.8 Hz, 5.0 Hz), 2.86 (m, 1H), 2.38 (s, 3H), 1.52 (s, 9H), 1.47 (s, 9H), 1.20 (s, 3H), 1.17 (s, 3H). 9. 3-(3-Methylphenylsulfonyl)amino-6-isopropyl-1-{2-(guanidinyloxyethyl)aminocabonylmethyl}-2-pyridinone hydrochloride: 3-(3-Methylphenylsulfonyl)amino-6-isopropyl-1-{[N,N′-di(tert-butoxycarbonyl)]-2-(guanidinyloxyethyl)aminocabonylmethyl}-2-pyridinone (0.70 g, 1.05 mmol), as prepared in the preceding step, was dissolved in methylene chloride (10 mL) and reacted with trifluoroacetic acid (5 mL) at ambient temperature for 2.5 hours. The evaporated crude product was lyophilized from acetonitrile/water, purified by flash column chromatography (gradient elution, 10% to 20% methanol in methylene chloride saturated with gaseous ammonia), and evaporated from 4 N HCl in ethanol (20 mL) giving the title compound as a white solid (0.36 g, 68%). 1H NMR (300 MHz, DMSO-d6) δ 10.91 (br s, 1H), 9.34 (brd s, 1H), 8.49 (t, 1H, J=5.5 Hz), 7.65 (m, 6H), 7.43 (m, 2H), 7.28 (d, 1H, J=7.8 Hz), 6.14 (d, 1H, J=7.9 Hz), 4.69 (s, 2H), 3.79 (t, 2H, J=5.3 Hz), 3.38 (m, 2H), 2.79 (m, 1H), 2.35 (s, 3H), 1.13 (s, 3H), 1.08 (s, 3H). Mass spectrum (LCMS, ESI) calcd. for C20H28N6O5S: 465.5 (M+H). Found: 465.1.

1. customas prepared in step 4 of Example 2
2. concentrationAfter concentration in vacuo
3. dissolutionthe crude product was dissolved in methylene chloride
4. washwashed with 10% aqueous citric acid, saturated NaHCO3, and brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. customThe evaporated filtrate was purified by flash column chromatography (5% methanol in methylene chloride)