(4R)-8-fluoro-3,4-dihydro-2H-chromen-4-amine

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (R)-8-Fluorochroman-4-amine (60 mg) was added to a solution of 2,4-dichloro-5-nitropyrimidine (70 mg) and DIEA (0.14 mL) in THF (5 mL) at −78° C. The reaction mixture was stirred for a further 15 min at −78° C. then removed from the cold bath and allowed to warm to RT. A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) was added to the reaction intermediate ((R)-2-chloro-N-(8-fluorochroman-4-yl)-5-nitropyrimidin-4-amine) and the resulting mixture was stirred at RT overnight. Purification via column chromatography (elution with MeOH/DCM) gave the titled compound (120 mg), MH+=407. then removed from the cold bath to warm to RT A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) the resulting mixture was stirred at RT overnight Purification via column chromatography (elution with MeOH/DCM)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (R)-8-Fluorochroman-4-amine (60 mg) was added to a solution of 2,4-dichloro-5-nitropyrimidine (70 mg) and DIEA (0.14 mL) in THF (5 mL) at −78° C. The reaction mixture was stirred for a further 15 min at −78° C. then removed from the cold bath and allowed to warm to RT. A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) was added to the reaction intermediate ((R)-2-chloro-N-(8-fluorochroman-4-yl)-5-nitropyrimidin-4-amine) and the resulting mixture was stirred at RT overnight. Purification via column chromatography (elution with MeOH/DCM) gave the titled compound (120 mg), MH+=407. then removed from the cold bath to warm to RT A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) the resulting mixture was stirred at RT overnight Purification via column chromatography (elution with MeOH/DCM)

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

Procedure: (R)-8-Fluorochroman-4-amine (HCl salt, 0.45 g, 2.2 mmol) was dissolved in 1 mL DMSO with 1.7 mL N,N-diisopropylethyl amine (9.7 mmol) in 40 mL anhydrous THF. To this solution was added 0.93 g (2.0 mmol) 4-(2,4-dimethoxybenzylamino)-3-(5-nitro-4-thiocyanatopyrimidin-2-ylamino)benzonitrile. The slightly cloudy mixture was stirred at room temperature for 16 hrs under Argon balloon till HPLC showed the completion of reaction. The mixture became clear then. The reaction mixture was diluted with EtOAc, washed with brine twice, and then dried over Na2SO4. Solvents were removed under vacuum to give 1.1 g dark red solid as the crude product. the completion of reaction washed with brine twice dried over Na2SO4 Solvents were removed under vacuum

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

Procedure: A mixture of 8-fluorochroman-4-amine (3.40 g), methyl 2-methoxyacetate (2.44 g) and Novozyme 435 (Aldrich, 0.68 g) in anhydrous tert-butyl methyl ether (75 mL) was heated at reflux under argon for 2 hours (at which time the ratio of acylated to unacylated product was 1:1 by HPLC). The solid that formed upon cooling was collected via filtration and dissolved in EtOAc. The mixture was filtered to remove the biocatalyst and washed once with 0.5M HCl to remove any lingering (S)-amine. The solvent was evaporated and the product was recrystallized from tert-butyl methyl ether to yield (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g). The reaction solvent and recrystallization mother liquor was washed 3 times with 0.5 M HCl and concentrated to yield additional (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.83 g). The combined acidic aqueous layers were made basic by NaOH and extracted with DCM to yield (S)-8-fluorochroman-4-amine (1.6 g). A solution of (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g) in 8M HCl in EtOH (50 mL) was heated at reflux for 4 hours. The solvents were removed from the cooled reaction mixture, the resulting solid was taken up in 50 mL of 0.5M NaOH, salted out with NaCl(s), and extracted 4 times with DCM to yield (R)-8-fluorochroman-4-amine (0.48 g, 87%). The % ee was checked via chiral HPLC: Chiralcel OD-H (0.46×25 cm analytical column, Daicel Chemical Industries) method: isocratic 5% (0.05% TFA/EtOH) 95% (0.05% TFA/Hex), Rt=7.2 min (S)-enantiomer, Rt=9.2 min (R)-enantiomer. at reflux for 4 hours The solvents were removed from the cooled reaction mixture extracted 4 times with DCM

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

Procedure: A mixture of 8-fluorochroman-4-amine (3.40 g), methyl 2-methoxyacetate (2.44 g) and Novozyme 435 (Aldrich, 0.68 g) in anhydrous tert-butyl methyl ether (75 mL) was heated at reflux under argon for 2 hours (at which time the ratio of acylated to unacylated product was 1:1 by HPLC). The solid that formed upon cooling was collected via filtration and dissolved in EtOAc. The mixture was filtered to remove the biocatalyst and washed once with 0.5M HCl to remove any lingering (S)-amine. The solvent was evaporated and the product was recrystallized from tert-butyl methyl ether to yield (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g). The reaction solvent and recrystallization mother liquor was washed 3 times with 0.5 M HCl and concentrated to yield additional (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.83 g). The combined acidic aqueous layers were made basic by NaOH and extracted with DCM to yield (S)-8-fluorochroman-4-amine (1.6 g). A solution of (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g) in 8M HCl in EtOH (50 mL) was heated at reflux for 4 hours. The solvents were removed from the cooled reaction mixture, the resulting solid was taken up in 50 mL of 0.5M NaOH, salted out with NaCl(s), and extracted 4 times with DCM to yield (R)-8-fluorochroman-4-amine (0.48 g, 87%). The % ee was checked via chiral HPLC: Chiralcel OD-H (0.46×25 cm analytical column, Daicel Chemical Industries) method: isocratic 5% (0.05% TFA/EtOH) 95% (0.05% TFA/Hex), Rt=7.2 min (S)-enantiomer, Rt=9.2 min (R)-enantiomer. at reflux for 4 hours The solvents were removed from the cooled reaction mixture extracted 4 times with DCM

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

Procedure: A mixture of 8-fluorochroman-4-amine (3.40 g), methyl 2-methoxyacetate (2.44 g) and Novozyme 435 (Aldrich, 0.68 g) in anhydrous tert-butyl methyl ether (75 mL) was heated at reflux under argon for two hours (at which time the ratio of acylated to unacylated product was 1:1 by HPLC). The solid that formed upon cooling was collected via filtration and dissolved in EtOAc. The mixture was filtered to remove the biocatalyst and washed once with 0.5M HCl to remove any lingering (S)-amine. The solvent was evaporated and the product was recrystallized from tert-butyl methyl ether to yield (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g). The reaction solvent and recrystallization mother liquor was washed three times with 0.5 M HCl and concentrated to yield additional (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.83 g). The combined acidic aqueous layers were made basic by NaOH and extracted with methylene chloride to yield (S)-8-fluorochroman-4-amine (5a) (1.6 g). A solution of (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g) in 8M HCl in EtOH (50 mL) was heated at reflux for four hours. The solvents were removed from the cooled reaction mixture, the resulting solid was taken up in 50 mL of 0.5M NaOH, salted out with NaCl(s), and extracted four times with methylene chloride to yield (R)-8-fluorochroman-4-amine (0.48 g (87%)) (5b). The % ee was checked via chiral HPLC: Chiralcel OD-H (0.46×25 cm analytical column, Daicel Chemical Industries) method: isocratic 5% (0.05% TFA/EtOH) 95% (0.05% TFA/Hex), Rt=7.2 min (S)-enantiomer, Rt=9.2 min (R)-enantiomer. at reflux for four hours The solvents were removed from the cooled reaction mixture extracted four times with methylene chloride

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

Procedure: A mixture of 8-fluorochroman-4-amine (3.40 g), methyl 2-methoxyacetate (2.44 g) and Novozyme 435 (Aldrich, 0.68 g) in anhydrous tert-butyl methyl ether (75 mL) was heated at reflux under argon for two hours (at which time the ratio of acylated to unacylated product was 1:1 by HPLC). The solid that formed upon cooling was collected via filtration and dissolved in EtOAc. The mixture was filtered to remove the biocatalyst and washed once with 0.5M HCl to remove any lingering (S)-amine. The solvent was evaporated and the product was recrystallized from tert-butyl methyl ether to yield (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g). The reaction solvent and recrystallization mother liquor was washed three times with 0.5 M HCl and concentrated to yield additional (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.83 g). The combined acidic aqueous layers were made basic by NaOH and extracted with methylene chloride to yield (S)-8-fluorochroman-4-amine (5a) (1.6 g). A solution of (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g) in 8M HCl in EtOH (50 mL) was heated at reflux for four hours. The solvents were removed from the cooled reaction mixture, the resulting solid was taken up in 50 mL of 0.5M NaOH, salted out with NaCl(s), and extracted four times with methylene chloride to yield (R)-8-fluorochroman-4-amine (0.48 g (87%)) (5b). The % ee was checked via chiral HPLC: Chiralcel OD-H (0.46×25 cm analytical column, Daicel Chemical Industries) method: isocratic 5% (0.05% TFA/EtOH) 95% (0.05% TFA/Hex), Rt=7.2 min (S)-enantiomer, Rt=9.2 min (R)-enantiomer. at reflux for four hours The solvents were removed from the cooled reaction mixture extracted four times with methylene chloride

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

Procedure: A mixture of 8-fluorochroman-4-amine (3.40 g), methyl 2-methoxyacetate (2.44 g) and Novozyme 435 (Aldrich, 0.68 g) in anhydrous tert-butyl methyl ether (75 mL) was heated at reflux under argon for two hours (at which time the ratio of acylated to unacylated product was 1:1 by HPLC). The solid that formed upon cooling was collected via filtration and dissolved in EtOAc. The mixture was filtered to remove the biocatalyst and washed once with 0.5M HCl to remove any lingering (S)-amine. The solvent was evaporated and the product was recrystallized from tert-butyl methyl ether to yield (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g). The reaction solvent and recrystallization mother liquor was washed three times with 0.5 M HCl and concentrated to yield additional (R)-N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.83 g). The combined acidic aqueous layers were made basic by NaOH and extracted with methylene chloride to yield (S)-8-fluorochroman-4-amine (5a) (1.6 g). A solution of (R)-N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g) in 8M HCl in EtOH (50 mL) was heated at reflux for four hours. The solvents were removed from the cooled reaction mixture, the resulting solid was taken up in 50 mL of 0.5M NaOH, salted out with NaCl(s), and extracted four times with methylene chloride to yield (R)-8-fluorochroman-4-amine (0.48 g (87%)) (5b). The % ee was checked via chiral HPLC: Chiralcel OD-H (0.46×25 cm analytical column, Daicel Chemical Industries) method: isocratic 5% (0.05% TFA/EtOH) 95% (0.05% TFA/Hex), Rt=7.2 min (S)-enantiomer, Rt=9.2 min (R)-enantiomer. at reflux for four hours The solvents were removed from the cooled reaction mixture extracted four times with methylene chloride

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

Procedure: Resolution of 8-fluorochroman-4-amine. (Procedure based on US published application 2004/0157739). A mixture of 8-fluorochroman-4-amine (3.40 g), methyl 2-methoxyacetate (2.44 g) and Novozyme 435 (Aldrich, 0.68 g) in anhydrous tert-butyl methyl ether (75 mL) was heated at reflux under argon for 2 hours (at which time the ratio of acylated to unacylated product was 1:1 by HPLC). The solid that formed upon cooling was collected via filtration and dissolved in EtOAc. The mixture was filtered to remove the biocatalyst and washed once with 0.5M HCl to remove any lingering (S)-amine. The solvent was evaporated and the product was recrystallized from tert-butyl methyl ether to yield (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g). The reaction solvent and recrystallization mother liquor was washed 3 times with 0.5 M HCl and concentrated to yield additional (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.83 g). The combined acidic aqueous layers were made basic by NaOH and extracted with DCM to yield (S)-8-fluorochroman-4-amine (1.6 g). A solution of (R)—N-(8-fluorochroman-4-yl)-2-methoxyacetamide (0.78 g) in 8M HCl in EtOH (50 mL) was heated at reflux for 4 hours. The solvents were removed from the cooled reaction mixture, the resulting solid was taken up in 50 mL of 0.5M NaOH, salted out with NaCl(S), and extracted 4 times with DCM to yield (R)-8-fluorochroman-4-amine (0.48 g (87%)). The % ee was checked via chiral HPLC: Chiralcel OD-H (0.46×25 cm analytical column, Daicel Chemical Industries) method: isocratic 5% (0.05% TFA/EtOH) 95% (0.05% TFA/Hex), Rt=7.2 min (S)-enantiomer, Rt=9.2 min (R)-enantiomer. at reflux for 4 hours The solvents were removed from the cooled reaction mixture extracted 4 times with DCM

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (R)-8-fluorochroman-4-amine (60 mg, Example 29) was added to a solution of 2,4-dichloro-5-nitropyrimidine (70 mg) and DIEA (0.14 mL) in THF (5 mL) at −78° C. The reaction mixture was stirred for a further 15 min at −78° C. then removed from the cold bath and allowed to warm to RT. A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) was added to the reaction intermediate ((R)-2-chloro-N-(8-fluorochroman-4-yl)-5-nitropyrimidin-4-amine) and the resulting mixture was stirred at RT overnight. Purification via column chromatography (elution with 1 MeOH/DCM) gave the titled compound (120 mg), MH+=407. then removed from the cold bath to warm to RT A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) the resulting mixture was stirred at RT overnight Purification via column chromatography (elution with 1 MeOH/DCM)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (R)-8-Fluorochroman-4-amine (60 mg) was added to a solution of 2,4-dichloro-5-nitropyrimidine (70 mg) and DIEA (0.14 mL) in THF (5 mL) at −78° C. The reaction mixture was stirred for a further 15 min at −78° C. then removed from the cold bath and allowed to warm to RT. A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) was added to the reaction intermediate ((R)-2-chloro-N-(8-fluorochroman-4-yl)-5-nitropyrimidin-4-amine) and the resulting mixture was stirred at RT overnight. Purification via column chromatography (elution with MeOH/DCM) gave the titled compound (120 mg), MH+=407. then removed from the cold bath to warm to RT A one molar solution of the sodium salt of benzimidazole (0.7 ml, stock solution prepared via the addition of sodium hydride to a benzimidazole solution in THF) the resulting mixture was stirred at RT overnight Purification via column chromatography (elution with MeOH/DCM)

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

Procedure: (R)-8-Fluorochroman-4-amine (HCl salt, 0.45 g, 2.2 mmol) was dissolved in 1 mL DMSO with 1.7 mL N,N-diisopropylethyl amine (9.7 mmol) in 40 mL anhydrous THF. To this solution was added 0.93 g (2.0 mmol) 4-(2,4-dimethoxybenzylamino)-3-(5-nitro-4-thiocyanatopyrimidin-2-ylamino)benzonitrile. The slightly cloudy mixture was stirred at room temperature for 16 hrs under Argon balloon till HPLC showed the completion of reaction. The mixture became clear then. The reaction mixture was diluted with EtOAc, washed with brine twice, and then dried over Na2SO4. Solvents were removed under vacuum to give 1.1 g dark red solid as the crude product. the completion of reaction washed with brine twice dried over Na2SO4 Solvents were removed under vacuum