2-fluoro-4-methoxyaniline

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (Z)-1-(2-Amino-1,2-dicyanovinyl)-3-(2-fluoro-4-methoxyphenyl)urea. In a 100 mL round-bottomed flask was added 2-fluoro-4-methoxyaniline (0.79 g, 5.60 mmol) and trichloromethyl carbonochloridate (0.68 mL, 5.60 mmol) in toluene (6 mL) to give a purple suspension. The mixture was then stirred at 110° C. for 3 h. Upon heating, the suspension becomes a homogeneous solution. After 3 h, no starting material remained (TLC, 3:1 hex/EtOAc). The reaction mixture was concentrated to afford 2-fluoro-1-isocyanato-4-methoxybenzene (0.936 g, 5.6 mmol, quant.) as a green oil. The intermediate 2-fluoro-1-isocyanato-4-methoxybenzene (0.936 g, 5.6 mmol) was then dissolved in acetonitrile (20 ml) and reacted with 2,3-diaminomaleonitrile (0.605 g, 5.60 mmol) according to General Procedure A. The product was filtered to give the title compound (1.36 g, 88%). MS (ESI) m/z 276.3[M+1]+. to give a purple suspension Upon heating After 3 h The reaction mixture was concentrated

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

Procedure: To cyanuric chloride (0.180 g, 1 mmol) in 1,4-dioxane (1 mL) at about −10 to −20° C. was added N,N-diisopropylethylamine (DIEA) (0.19 mL, 1 mmol) in CH3CN (1 mL) and 3-fluoro-p-anisidine (0.14 g, 1 mmol) in CH3CN (1 mL) and stirred for about 1 hour. The reaction mixture was then stirred at room temperature for about 1 hour. Then a solution of cycloheptylamine (0.13 mL, 1 mmol) and DIEA (0.19 mL, 1 mmol) in CH3CN (0.5 mL) was added and the reaction mixture was stirred overnight at rt. Then, N-methyl-4(methylamino)piperidine (0.15 mL, 1 mmol) and DIEA (0.19 mL, 1 mmol) in CH3CN (0.5 mL) were added and the reaction mixture was refluxed overnight. The reaction mixture was worked-up using saturated sodium bicarbonate, and brine. The organic layer was separated and dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude material was purified by column chromatography (silica gel, 90:9:1 dichloromethane: methanol: conc. ammonium hydroxide) to give 158 (0.130 g, 28%); TLC (silica gel, 90:9:1, CH2Cl2, CH3OH, conc. NH4OH), Rf 0.26); 1H NMR (600 MHz, CDCl3, 55° C.) δ 7.74 (br s, 1H), 6.94 (br s, 1H), 6.81–6.84 (m, 2H), 4.83 (br resonance, 1H), 4.55 (s, 1H), 3.98 (s, 1H), 3.82 (s, 3H), 2.97 (s, 3H), 2.94 (br d, J=11.9 Hz, 2H), 2.29 (s, 3H), 2.06–2.10 (m, 2H), 1.93–1.97 (m, 2H), 1.84–1.90 (m, 2H), 1.44–1.66 (m, 12H). The reaction mixture was then stirred at room temperature for about 1 hour the reaction mixture was stirred overnight at rt the reaction mixture was refluxed overnight The organic layer was separated dried over sodium sulfate filtered concentrated under reduced pressure The crude material was purified by column chromatography (silica gel, 90:9:1 dichloromethane: methanol: conc. ammonium hydroxide)

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

Procedure: Cyanuric chloride (1.84 g, 10 mmol) in CH3CN (20 mL) was cooled to about −10° C. was added 3-fluoro-p-anisidine (1.41 g, 10 mmol) followed by DIEA (1.8 mL, 10 mmol). The reaction was stirred for about 45 min then at room temperature for about 45 min under an N2 atmosphere. Cycloheptylamine (1.26 mL, 10 mmol) was added followed by DIEA (1.8 mL, 10 mmol) and the reaction was stirred at room temperature overnight. N,N-dimethylethylenediamine (1.1 mL, 10 mmol) was added followed by DIEA (1.8 mL, 10 mmol) and the mixture was heated at reflux under N2 overnight. The reaction was diluted with ethyl acetate, washed with brine, and dried over anhydrous K2CO3. The material (1.178 g) was purified by silica gel column chromatography to afford a solid 150 (1.178 g, 28%), mp 73–76° C.; HPLC: Inertsil ODS-3V C18, 40:30:30 [KH2PO4 (0.01M, pH 3.2): CH3OH: CH3CN], 264 nm, Rt 10.8 min, 95.1% purity; MS (ESI): m/z 418 (M+H, 100), 373 (11.9), 322 (7.8), 277 (6.8), 162 (3.6). at room temperature for about 45 min under an N2 atmosphere the reaction was stirred at room temperature overnight the mixture was heated at reflux under N2 overnight washed with brine dried over anhydrous K2CO3 The material (1.178 g) was purified by silica gel column chromatography

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:-10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: With vigorous stirring, 9.15 g (0.065 mole) of 2-fluoro-4-methoxyaniline (Example 3, Step B) was added to 60 mL of concentrated hydrochloric acid that had been cooled to -10° C. A solution of 4.83 g (0.070 mole) of sodium nitrite in 30 mL of water was slowly added dropwise, while the temperature was kept at or below -10° C. Upon completion of addition, the reaction mixture was stirred at -10° C. for one hour, after which 33.85 (0.150 mole) of tin(II) chloride dihydrate in 50 mL of concentrated hydrochloric acid Was added slowly, dropwise, while the temperature was kept below -5° C. After the reaction mixture had stirred for one hour as it warmed to ambient temperature, the crude product was filtered from the mixture and dissolved in 250 mL of water. This solution was made basic with 4N sodium hydroxide and extracted with methylene chloride. The combined extracts were dried over anhydrous sodium sulfate and filtered. The filtrate was placed on a silica gel column and eluted with methylene chloride to remove colored impurities and then with ethyl acetate to obtain the desired product. The solvent was evaporated under reduced pressure to yield 6.30 g of 2-fluoro-4-methoxyphenylhydrazine. The NMR spectrum was consistent with the proposed structure. below -10° C Upon completion of addition was kept below -5° C After the reaction mixture had stirred for one hour as it warmed to ambient temperature the crude product was filtered from the mixture dissolved in 250 mL of water extracted with methylene chloride The combined extracts were dried over anhydrous sodium sulfate filtered eluted with methylene chloride to remove colored impurities

Conditions: temp:-10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: With vigorous stirring, 9.15 g (0.065 mole) of 2-fluoro-4-methoxyaniline (Example 3, Step B) was added to 60 mL of concentrated hydrochloric acid that had been cooled to -10° C. A solution of 4.83 g (0.070 mole) of sodium nitrite in 30 mL of water was slowly added dropwise, while the temperature was kept at or below -10° C. Upon completion of addition, the reaction mixture was stirred at -10° C. for one hour, after which 33.85 (0.150 mole) of tin(II) chloride dihydrate in 50 mL of concentrated hydrochloric acid Was added slowly, dropwise, while the temperature was kept below -5° C. After the reaction mixture had stirred for one hour as it warmed to ambient temperature, the crude product was filtered from the mixture and dissolved in 250 mL of water. This solution was made basic with 4N sodium hydroxide and extracted with methylene chloride. The combined extracts were dried over anhydrous sodium sulfate and filtered. The filtrate was placed on a silica gel column and eluted with methylene chloride to remove colored impurities and then with ethyl acetate to obtain the desired product. The solvent was evaporated under reduced pressure to yield 6.30 g of 2-fluoro-4-methoxyphenylhydrazine. The NMR spectrum was consistent with the proposed structure. below -10° C Upon completion of addition was kept below -5° C After the reaction mixture had stirred for one hour as it warmed to ambient temperature the crude product was filtered from the mixture dissolved in 250 mL of water extracted with methylene chloride The combined extracts were dried over anhydrous sodium sulfate filtered eluted with methylene chloride to remove colored impurities

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

Procedure: To a solution of 13.75 g (0.0967 mole) of 2-fluoro-4-methoxyaniline in 120 mL of toluene was slowly added over a period of 30 minutes a solution of 19.13 g (0.0967 mole) of trichloromethyl chloroformate in 30 mL of toluene. During the addition the temperature rose to 35° C. The reaction mixture was stirred without external heating for 30 minutes and then heated at reflux for approximately 17 hours. At the end of this time all of the solvent was removed by distillation, leaving 2-fluoro-4-methoxyphenyl isocyanate as a purple liquid, which was used immediately in Step D. During the addition the temperature rose to 35° C without external heating for 30 minutes heated at reflux for approximately 17 hours At the end of this time all of the solvent was removed by distillation