hydrazine;dihydrochloride

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of ethyl 3-ethyl-2,4-dioxo-4-(2,4,6-trimethylphenyl)butanoate (6.0 g, 20.7 mmol) and hydrazine dihydrochloride (2.17 g, 20.7 mmoL) in 100 mL of EtOH was stirred at 80° C. for 6 hours. The solvent was then removed from the mixture. 200 mL of water was added to the residue and mixture was neutralized by the addition of solid NaHCO3. The product was extracted into ether. The ether extract was dried over Na2SO4 and evaporated to give 5.8 g as an oil which was used in the next reaction without further purification. The solvent was then removed from the mixture 200 mL of water was added to the residue and mixture was neutralized by the addition of solid NaHCO3 The product was extracted into ether The ether extract was dried over Na2SO4 evaporated to give 5.8 g as an oil which was used in the next reaction without further purification

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(5-fluoro-2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-oxobutanenitrile (0.26 mg, 0.80 mmol) in ethanol (5 mL) was added hydrazine dihydrochloride (105 mg, 0.9 mmol). The resulting mixture was heated at reflux for 1 hour. It was cooled to room temperature then poured into a saturated sodium bicarbonate solution (10 mL) and the mixture was extracted with ethyl acetate (3×10 mL). The combined extract was washed with aqueous sodium bicarbonate solution, brine, dried over sodium sulfate, filtered and concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane) to provide 4-(5-fluoro-2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-methyl-1H-pyrazol-5-amine (0.15 g, 0.45 mmol, 56%) yield 1H NMR (400 MHz, d6-DMSO): 7.06-7.02 (m, 1H), 6.72-6.69 (m, 1H), 4.18-4.16 (m, 2H), 3.83-3.81 (m, 2H), 3.71-3.69 (m. 2H), 3.36-3.64 (m, 2H), 3.32 (s, 3H), 3.10 (s, 3H), 2.16 (s, 3H); MS (EI) for C16H22FN3O4: 340 (MH+). The resulting mixture was heated at reflux for 1 hour the mixture was extracted with ethyl acetate (3×10 mL) The combined extract was washed with aqueous sodium bicarbonate solution, brine dried over sodium sulfate filtered concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(5-fluoro-2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-oxobutanenitrile (0.26 mg, 0.80 mmol) in ethanol (5 mL) was added hydrazine dihydrochloride (105 mg, 0.9 mmol). The resulting mixture was heated at reflux for 1 hour. It was cooled to room temperature then poured into a saturated sodium bicarbonate solution (10 mL) and the mixture was extracted with ethyl acetate (3×10 mL). The combined extract was washed with aqueous sodium bicarbonate solution, brine, dried over sodium sulfate, filtered and concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane) to provide 4-(5-fluoro-2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-methyl-1H-pyrazol-5-amine (0.15 g, 0.45 mmol, 56%) yield 1H NMR (400 MHz, d6-DMSO): 7.06-7.02 (m, 1H), 6.72-6.69 (m, 1H), 4.18-4.16 (m, 2H), 3.83-3.81 (m, 2H), 3.71-3.69 (m. 2H), 3.36-3.64 (m, 2H), 3.32 (s, 3H), 3.10 (s, 3H), 2.16 (s, 3H); MS (EI) for C16H22FN3O4: 340 (MH+). The resulting mixture was heated at reflux for 1 hour the mixture was extracted with ethyl acetate (3×10 mL) The combined extract was washed with aqueous sodium bicarbonate solution, brine dried over sodium sulfate filtered concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-(8-fluoro-2,3-dihydro-1,4-benzodioxin-6-yl)-3-oxobutanenitrile (0.37 g; 1.56 mmol) was dissolved in dry ethanol (5 mL) and hydrazine dihydrochloride (0.20 g, 1.87 mmol) then triethylamine (217 μg, 1.56 mmol) were added. The reaction mixture was refluxed for 2 h, cooled to rt and the solvent was evaporated under vacuum. The residue was dissolved in ethyl acetate (50 ml), washed with saturated sodium bicarbonate (2×25 mL), brine (25 ml) then dried over sodium sulfate. Filtration and concentration gave 4-(8-fluoro-2,3-dihydro-1,4-benzodioxin-6-yl)-3-methyl-1H-pyrazol-5-amine (0.36 g, 93% yield) as an orange solid. 1H NMR (400 MHz, d6-DMSO) δ 6.75 (dd, 1H), 6.65 (m, 1H), 4.30 (m, 4H), 2.14 (s, 3H). MS (EI) for C12H12FN3O2: 250 (MH+). The reaction mixture was refluxed for 2 h the solvent was evaporated under vacuum The residue was dissolved in ethyl acetate (50 ml) washed with saturated sodium bicarbonate (2×25 mL), brine (25 ml) then dried over sodium sulfate Filtration and concentration

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-(8-fluoro-2,3-dihydro-1,4-benzodioxin-6-yl)-3-oxobutanenitrile (0.37 g; 1.56 mmol) was dissolved in dry ethanol (5 mL) and hydrazine dihydrochloride (0.20 g, 1.87 mmol) then triethylamine (217 μg, 1.56 mmol) were added. The reaction mixture was refluxed for 2 h, cooled to rt and the solvent was evaporated under vacuum. The residue was dissolved in ethyl acetate (50 ml), washed with saturated sodium bicarbonate (2×25 mL), brine (25 ml) then dried over sodium sulfate. Filtration and concentration gave 4-(8-fluoro-2,3-dihydro-1,4-benzodioxin-6-yl)-3-methyl-1H-pyrazol-5-amine (0.36 g, 93% yield) as an orange solid. 1H NMR (400 MHz, d6-DMSO) δ 6.75 (dd, 1H), 6.65 (m, 1H), 4.30 (m, 4H), 2.14 (s, 3H). MS (EI) for C12H12FN3O2: 250 (MH+). The reaction mixture was refluxed for 2 h the solvent was evaporated under vacuum The residue was dissolved in ethyl acetate (50 ml) washed with saturated sodium bicarbonate (2×25 mL), brine (25 ml) then dried over sodium sulfate Filtration and concentration

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(2-(methyloxy)-3-{[2-(methyloxy)ethyl]oxy}phenyl)-3-oxobutanenitrile (0.17 g, 0.65 mmol) in ethanol (5 mL) was added hydrazine dihydrochloride (99 mg, 0.94 mmol). The resulting mixture was heated at reflux for 1 hour. It was cooled, poured into a saturated sodium bicarbonate solution (10 mL), and the mixture was extracted with ethyl acetate (3×10 mL). The combined extract was washed with aqueous sodium bicarbonate solution, brine, dried over sodium sulfate, filtered and concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol in dichloromethane) to provide 3-methyl-4-(2-(methyloxy)-3-{[2-(methyloxy)ethyl]oxy}phenyl)-1H-pyrazol-5-amine (115 mg, 0.42 mmol, 65% yield). MS (EI) for C14H19N3O3: 278 (MH+). The resulting mixture was heated at reflux for 1 hour It was cooled the mixture was extracted with ethyl acetate (3×10 mL) The combined extract was washed with aqueous sodium bicarbonate solution, brine dried over sodium sulfate filtered concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol in dichloromethane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(2-(methyloxy)-3-{[2-(methyloxy)ethyl]oxy}phenyl)-3-oxobutanenitrile (0.17 g, 0.65 mmol) in ethanol (5 mL) was added hydrazine dihydrochloride (99 mg, 0.94 mmol). The resulting mixture was heated at reflux for 1 hour. It was cooled, poured into a saturated sodium bicarbonate solution (10 mL), and the mixture was extracted with ethyl acetate (3×10 mL). The combined extract was washed with aqueous sodium bicarbonate solution, brine, dried over sodium sulfate, filtered and concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol in dichloromethane) to provide 3-methyl-4-(2-(methyloxy)-3-{[2-(methyloxy)ethyl]oxy}phenyl)-1H-pyrazol-5-amine (115 mg, 0.42 mmol, 65% yield). MS (EI) for C14H19N3O3: 278 (MH+). The resulting mixture was heated at reflux for 1 hour It was cooled the mixture was extracted with ethyl acetate (3×10 mL) The combined extract was washed with aqueous sodium bicarbonate solution, brine dried over sodium sulfate filtered concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol in dichloromethane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(3,4-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-oxobutanenitrile (0.57 g, 1.9 mmol) in ethanol (5 mL) was added hydrazine dihydrochloride (0.20 g, 2.2 mmol) The resulting mixture was heated at reflux for 1 hour. It was cooled, pour into a saturated sodium bicarbonate solution (10 mL), and the mixture was extracted with ethyl acetate (3×10 mL). The combined extract was washed with aqueous sodium bicarbonate solution, brine, dried over sodium sulfate, filtered and concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane) to provide 4-(3,4-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-methyl-1H-pyrazol-5-amine (0.46 g, 1.4 mmol, 74% yield). 1H NMR (400 MHz, CDCl3): 6.96-6.92 (m, 2H), 6.87-6.84 (d, d, 1H), 4.19-4.16 (m, 4H), 3.79-3.76 (m, 4H), 3.67 (s, 2H), 3.46 (s, 3H), 3.44 (s, 3H), 2.25 (s, 3H). was heated at reflux for 1 hour It was cooled the mixture was extracted with ethyl acetate (3×10 mL) The combined extract was washed with aqueous sodium bicarbonate solution, brine dried over sodium sulfate filtered concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(3,4-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-oxobutanenitrile (0.57 g, 1.9 mmol) in ethanol (5 mL) was added hydrazine dihydrochloride (0.20 g, 2.2 mmol) The resulting mixture was heated at reflux for 1 hour. It was cooled, pour into a saturated sodium bicarbonate solution (10 mL), and the mixture was extracted with ethyl acetate (3×10 mL). The combined extract was washed with aqueous sodium bicarbonate solution, brine, dried over sodium sulfate, filtered and concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane) to provide 4-(3,4-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-methyl-1H-pyrazol-5-amine (0.46 g, 1.4 mmol, 74% yield). 1H NMR (400 MHz, CDCl3): 6.96-6.92 (m, 2H), 6.87-6.84 (d, d, 1H), 4.19-4.16 (m, 4H), 3.79-3.76 (m, 4H), 3.67 (s, 2H), 3.46 (s, 3H), 3.44 (s, 3H), 2.25 (s, 3H). was heated at reflux for 1 hour It was cooled the mixture was extracted with ethyl acetate (3×10 mL) The combined extract was washed with aqueous sodium bicarbonate solution, brine dried over sodium sulfate filtered concentrated to give an oily residue which was purified by flash chromatography (silica gel, 5% methanol-dichloromethane)

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)acetonitrile (0.93 g, 3.52 mmol) in THF (20 mL) was added sodium hydride (0.42 g, 10.56 mmol) and ethyl acetate (1.55 g, 17.60 mmol), and the mixture was stirred at 60° C. for 90 min. After cooling to 0° C., water was added (50 mL), the aqueous layer was washed with dichloro-methane (3×25 mL), acidified with 1N HCl to pH 3, and extracted with ethyl acetate (3×50 mL). The ethyl acetate layer was washed with brine (50 mL), dried with sodium sulfate, and concentrated to give a yellow oil. This oil was dissolved in dry ethanol (5 mL), and hydrazine dihydrochloride (0.44 g, 4.20 mmol) and triethylamine (0.22 g, 2.10 mmol) were added. The reaction mixture was refluxed for 90 min, cooled to rt, and added into sat. sodium bicarbonate (100 mL). The aqueous layer was extracted with dichloromethane (3×50 mL), the organic layer was dried with sodium sulfate, and concentrated. Column chromatography on silica (95:5 dichloromethane/methanol) afforded 4-(2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-methyl-1H-pyrazol-5-amine (0.81 g, 71% yield) as a pale yellow oil. 1H NMR (400 MHz, d4-methanol) δ7.08 (t, 1H), 6.97 (dd, 1H), 6.85 (dd, 1H), 4.18 (m, 2H), 3.90 (m, 2H), 3.78 (m, 2H), 3.47 (m, 2H), 3.43 (s, 3H), 3.23 (s, 3H), 2.19 (s, 3H). After cooling to 0° C. the aqueous layer was washed with dichloro-methane (3×25 mL) extracted with ethyl acetate (3×50 mL) The ethyl acetate layer was washed with brine (50 mL) dried with sodium sulfate concentrated to give a yellow oil The reaction mixture was refluxed for 90 min cooled to rt The aqueous layer was extracted with dichloromethane (3×50 mL) the organic layer was dried with sodium sulfate concentrated

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)acetonitrile (0.93 g, 3.52 mmol) in THF (20 mL) was added sodium hydride (0.42 g, 10.56 mmol) and ethyl acetate (1.55 g, 17.60 mmol), and the mixture was stirred at 60° C. for 90 min. After cooling to 0° C., water was added (50 mL), the aqueous layer was washed with dichloro-methane (3×25 mL), acidified with 1N HCl to pH 3, and extracted with ethyl acetate (3×50 mL). The ethyl acetate layer was washed with brine (50 mL), dried with sodium sulfate, and concentrated to give a yellow oil. This oil was dissolved in dry ethanol (5 mL), and hydrazine dihydrochloride (0.44 g, 4.20 mmol) and triethylamine (0.22 g, 2.10 mmol) were added. The reaction mixture was refluxed for 90 min, cooled to rt, and added into sat. sodium bicarbonate (100 mL). The aqueous layer was extracted with dichloromethane (3×50 mL), the organic layer was dried with sodium sulfate, and concentrated. Column chromatography on silica (95:5 dichloromethane/methanol) afforded 4-(2,3-bis{[2-(methyloxy)ethyl]oxy}phenyl)-3-methyl-1H-pyrazol-5-amine (0.81 g, 71% yield) as a pale yellow oil. 1H NMR (400 MHz, d4-methanol) δ7.08 (t, 1H), 6.97 (dd, 1H), 6.85 (dd, 1H), 4.18 (m, 2H), 3.90 (m, 2H), 3.78 (m, 2H), 3.47 (m, 2H), 3.43 (s, 3H), 3.23 (s, 3H), 2.19 (s, 3H). After cooling to 0° C. the aqueous layer was washed with dichloro-methane (3×25 mL) extracted with ethyl acetate (3×50 mL) The ethyl acetate layer was washed with brine (50 mL) dried with sodium sulfate concentrated to give a yellow oil The reaction mixture was refluxed for 90 min cooled to rt The aqueous layer was extracted with dichloromethane (3×50 mL) the organic layer was dried with sodium sulfate concentrated

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-[3,4-bis(methyloxy)phenyl]-4-(methyloxy)-3-oxobutanenitrile (200 mg, 0.8 mmol) in ethanol (5 mL) was added hydrazine dihydrochloride (101 mg, 0.9 mmol). The resulting mixture was heated at reflux for 1 hour. It was cooled, pour into a saturated sodium bicarbonate solution (10 mL), and the mixture was extracted with ethyl acetate (3×10 mL). The combined extract was washed with water and brine (30 mL each), dried over sodium sulfate, filtered and concentrated to give oily residue. To this residue was added of 3-chloro-4-hydroxybenzaldehyde (189 mg, 1.2 mmol) and trifluoroacetic acid (3 mL), and the resulting mixture was heated at 70° C. for 18 hours. Then the reaction mixture was concentrated, dissolved in 10 mL of N,N-dimethylformamide and purified by preparatory reverse phase HPLC (Shimadzu LC-8A HPLC, Waters Xterra C18 30 mm×100 mm column, acetonitrile-water-trifluoroacetic buffer). After lyophillization of the pure fractions a yellow powder was obtained. The solid was dissolved in 4 mL of 1:1 methanol: 4N hydrogen chloride in dioxane, and evaporated to dryness (repeated three times) to give 4-{7,8-bis(methyloxy)-1-[(methyloxy)methyl]-3H-pyrazolo[3,4-c]isoquinolin-5-yl}-2-chlorophenol hydrochloride salt (101 mg, 0.23 mmol, 29% yield). 1H NMR (400 MHz, d6-DMSO): 10.64 (b, 1H), 7.82 (s, 1H), 7.71 (s, 1H), 7.58-7.56 (d, 1H), 7.45 (s, 1H), 7.17-7.15 (d, 1H), 4.92 (s, 2H), 4.02 (s, 3H), 3.78 (s, 3H); MS (EI) for C20H18ClN3O4: 400 (MH+). The resulting mixture was heated at reflux for 1 hour It was cooled the mixture was extracted with ethyl acetate (3×10 mL) The combined extract was washed with water and brine (30 mL each) dried over sodium sulfate filtered concentrated to give oily residue Then the reaction mixture was concentrated dissolved in 10 mL of N,N-dimethylformamide purified by preparatory reverse phase HPLC (Shimadzu LC-8A HPLC, Waters Xterra C18 30 mm×100 mm column, acetonitrile-water-trifluoroacetic buffer) After lyophillization of the pure fractions a yellow powder was obtained 4N hydrogen chloride in dioxane, and evaporated to dryness (repeated three times)