4-chloro-2,6-difluorobenzaldehyde

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

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

Conditions: temp:35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Chloro-2,6-difluoro-benzaldehyde (15 g, 85 mmol) was dissolved in 1,2-dimethoxyethane 170 ml). O-Methyl-hydroxylamine hydrochloride (7.1 g, 85 mmol) and potassium carbonate (12.9 g, 93.5 mmol) were then added and the mixture was stirred at 35° C. for 24 h. The reaction was filtered, rinsed with dichloromethane, evaporated and redissolved in DMF (170 ml). Hydrazine (2.9 ml 93.5 mmol) was added and the reaction was stirred at 100° C. for 1 h. After cooling, water and ethyl acetate were added. The layers were separated and the aqueous layer was extracted twice more with ethyl acetate. The combined organic layers were washed with water and sodium chloride solution then dried over sodium sulfate. The solvent was evaporated to leave a solid which was purified by silica gel chromatography (diethyl ether/hexanes) to give 7 g (49%) of 6-chloro-4-fluoro-1H-indazole. (M+H)+=171. The reaction was filtered rinsed with dichloromethane evaporated redissolved in DMF (170 ml) the reaction was stirred at 100° C. for 1 h After cooling The layers were separated the aqueous layer was extracted twice more with ethyl acetate The combined organic layers were washed with water and sodium chloride solution then dried over sodium sulfate The solvent was evaporated to leave a solid which was purified by silica gel chromatography (diethyl ether/hexanes)

Conditions: temp:35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Chloro-2,6-difluoro-benzaldehyde (15 g, 85 mmol) was dissolved in 1,2-dimethoxyethane 170 ml). O-Methyl-hydroxylamine hydrochloride (7.1 g, 85 mmol) and potassium carbonate (12.9 g, 93.5 mmol) were then added and the mixture was stirred at 35° C. for 24 h. The reaction was filtered, rinsed with dichloromethane, evaporated and redissolved in DMF (170 ml). Hydrazine (2.9 ml 93.5 mmol) was added and the reaction was stirred at 100° C. for 1 h. After cooling, water and ethyl acetate were added. The layers were separated and the aqueous layer was extracted twice more with ethyl acetate. The combined organic layers were washed with water and sodium chloride solution then dried over sodium sulfate. The solvent was evaporated to leave a solid which was purified by silica gel chromatography (diethyl ether/hexanes) to give 7 g (49%) of 6-chloro-4-fluoro-1H-indazole. (M+H)+=171. The reaction was filtered rinsed with dichloromethane evaporated redissolved in DMF (170 ml) the reaction was stirred at 100° C. for 1 h After cooling The layers were separated the aqueous layer was extracted twice more with ethyl acetate The combined organic layers were washed with water and sodium chloride solution then dried over sodium sulfate The solvent was evaporated to leave a solid which was purified by silica gel chromatography (diethyl ether/hexanes)

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

Procedure: To a solution of the title compound of Step A (270 mg, 1.5 mmol) and 3-hydroxy-azetidine-1-carboxylic acid tert-butyl ester (270 mg, 1.5 mmol) in dry DMF (10 mL) at 0° C. was added NaH (60% in mineral oil, 22 mg, 1.5 mmol). After 18 h, H2O and EtOAc were added and the aqueous layer was extracted with EtOAc. The combined organic extracts were dried and concentrated. The crude residue was purified by RP HPLC to provide the title compound (75 mg, 15%). MS (ESI): mass calcd. for C15H17ClFNO4, 329.1; m/z found, 274.0 [M+H-56]+. 1H NMR (CDCl3): 10.4 (s, 1H), 6.84 (dd, J=10.0, 1.6 Hz, 1H), 6.39 (dd, J=1.4, 1.3 Hz, 1H), 5.00-4.92 (m, 1H), 4.38 (dd, J=9.9, 6.3 Hz, 2H), 4.08 (dd, J=10.7, 4.0 Hz, 2H), 1.46 (s, 9H). the aqueous layer was extracted with EtOAc The combined organic extracts were dried concentrated The crude residue was purified by RP HPLC

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

Procedure: To a −78° C. solution of 1-chloro-3,5-difluoro-benzene (5.0 g, 34 mmol) in THF (70 mL) at was added n-butyl lithium (1.6 M in hexane, 19 mL). After 50 min, DMF (5.2 mL, 67 mmol) was added and the reaction was allowed to warm to rt over 18 h. After the addition of 0.5 M HCl (150 mL) and ether (150 mL), the aqueous layer was extracted with Et2O (3×). The combined organic extracts were dried and concentrated to provide a yellow solid. The crude material was dissolved in warm hexanes and a small amount of white solid formed upon cooling. This white solid was filtered off and discarded. The filtrate was concentrated to provide the title compound as a light yellow solid (2.5 g, 41%). 1H NMR (CDCl3): 10.3 (s, 1H), 7.06 (d, J=8.1 Hz, 2H). the aqueous layer was extracted with Et2O (3×) The combined organic extracts were dried concentrated to provide a yellow solid a small amount of white solid formed upon cooling This white solid was filtered off The filtrate was concentrated

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

Procedure: To a mixture of 4-chloro-2,6-difluoro-benzaldehyde (5.7 g, 32 mmol), tetrahydrofuran (150 mL) and ethanol (20 mL) was added sodium borohydride (1.2 g, 32 mmol) at 0° C. The mixture was stirred for 30 minutes, warmed to ambient temperature, and additional sodium borohydride (0.40 g, 11 mmol) was added to drive the reaction to completion (TLC). The mixture was concentrated in vacuo, diluted with ether and treated cautiously with 1M aqueous HCl. The aqueous phase was extracted 3× with ether, and the combined organic layers were dried over MgSO4, filtered and concentrated. Trituration of the residue with pentane afforded 4.8 g (83%) of (4-chloro-2,6-difluoro-phenyl)-methanol as a colorless solid. 1H NMR (300 MHz, CDCl3) δ 7.04 (d, 2H, J=7.1 Hz), 4.73 (s, 2H) ppm. the reaction to completion (TLC) The mixture was concentrated in vacuo diluted with ether treated cautiously with 1M aqueous HCl The aqueous phase was extracted 3× with ether the combined organic layers were dried over MgSO4 filtered concentrated

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

Procedure: To a solution of 3,5-difluoro-1-chlorobenzene (5.0 g, 34 mmol) in tetrahydrofuran (70 mL) at −78° C. was added a solution of n-butyllithium in hexane (12.1 mL, 2.5 M, 30 mmol). After stirring for 1 hour, dimethylformamide (5.2 mL, 67 mmol) was added, and the mixture was stirred for 1.5 hours. The mixture was warmed to ambient temperature, diluted with ether and poured into 150 mL of 0.5 M aqueous HCl. The aqueous phase was extracted 3× into ether, and the combined organic layers were dried over MgSO4, filtered and concentrated in vacuo, affording 5.72 g (96%) of 4-chloro-2,6-difluoro-benzaldehyde as a colorless solid. 1H NMR (400 MHz, CDCl3) δ 10.27 (s, 1H), 7.04 (d, 2H, J=7.9 Hz) ppm. the mixture was stirred for 1.5 hours The aqueous phase was extracted 3× into ether the combined organic layers were dried over MgSO4 filtered concentrated in vacuo

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

Procedure: To a solution of 3,5-difluoro-1-chlorobenzene (5.0 g, 34 mmol) in tetrahydrofuran (70 mL) at −78° C. was added a solution of n-butyllithium in hexane (12.1 mL, 2.5 M, 30 mmol). After stirring for 1 hour, dimethylformamide (5.2 mL, 67 mmol) was added, and the mixture was stirred for 1.5 hours. The mixture was warmed to ambient temperature, diluted with ether and poured into 150 mL of 0.5 M aqueous HCl. The aqueous phase was extracted 3× into ether, and the combined organic layers were dried over MgSO4, filtered and concentrated in vacuo, affording 5.72 g (96%) of 4-chloro-2,6-difluoro-benzaldehyde as a colorless solid. 1H NMR (400 MHz, CDCl3) δ 10.27 (s, 1H), 7.04 (d, 2H, J=7.9 Hz) ppm. the mixture was stirred for 1.5 hours The aqueous phase was extracted 3× into ether the combined organic layers were dried over MgSO4 filtered concentrated in vacuo

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred suspension of 4-chloro-2,6-difluorobenzaldehyde (45 g, 255 mmol) in DMA (360 mL), at room temperature under nitrogen was added guanidine bis(carbonate) (70.0 g, 382 mmol). The mixture was heated to 140° C. for 3 hours. The reaction was then cooled to room temperature followed by addition of 400 mL water with stirring. The mixture was then filtered. The solids were then collected and triturated in 200 mL methanol for 10 minutes, then filtered. These solids were then dried in vacuo to obtain 31.6 g (63%) of 7-chloro-5-fluoroquinazolin-2-amine (82a) as a brown solid. The reaction was then cooled to room temperature The mixture was then filtered The solids were then collected triturated in 200 mL methanol for 10 minutes filtered These solids were then dried in vacuo

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

Procedure: 2.00 g (11.33 mmol) of 4-chloro-2,6-difluorobenzaldehyde were dissolved in 15 ml of diethyl ether at 0° C., and 34.0 ml (16.99 mmol) of a 0.5N solution of cyclopropylmagnesium bromide in tetrahydrofuran were slowly added dropwise. After stirring at RT for 2 h, the reaction solution was mixed with 1N hydrochloric acid and ethyl acetate, and the phases were separated. The aqueous phase was extracted three times with diethyl ether. The combined organic phases were washed with saturated aqueous sodium chloride solution, and the solvents were removed in vacuo. The crude product was purified by preparative HPLC (mobile phase: acetonitrile/water gradient). 1.20 g (48% of theory) of the title compound were obtained. the phases were separated The aqueous phase was extracted three times with diethyl ether The combined organic phases were washed with saturated aqueous sodium chloride solution the solvents were removed in vacuo The crude product was purified by preparative HPLC (mobile phase: acetonitrile/water gradient)

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

Procedure: 2.00 g (11.33 mmol) of 4-chloro-2,6-difluorobenzaldehyde were dissolved in 15 ml of diethyl ether at 0° C., and 34.0 ml (16.99 mmol) of a 0.5N solution of cyclopropylmagnesium bromide in tetrahydrofuran were slowly added dropwise. After stirring at RT for 2 h, the reaction solution was mixed with 1N hydrochloric acid and ethyl acetate, and the phases were separated. The aqueous phase was extracted three times with diethyl ether. The combined organic phases were washed with saturated aqueous sodium chloride solution, and the solvents were removed in vacuo. The crude product was purified by preparative HPLC (mobile phase: acetonitrile/water gradient). 1.20 g (48% of theory) of the title compound were obtained. the phases were separated The aqueous phase was extracted three times with diethyl ether The combined organic phases were washed with saturated aqueous sodium chloride solution the solvents were removed in vacuo The crude product was purified by preparative HPLC (mobile phase: acetonitrile/water gradient)