tert-butyl N-[(1R,2R)-2-aminocyclohexyl]carbamate

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

Procedure: 5-Chloroindole-2-carboxylic acid (2.88 g), 1-hydroxybenzotriazole monohydrate (2.08 g) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.95 g) were added to a solution of (±)-trans-N-tert-butoxycarbonyl-1,2-cyclohexanediamine (3.00 g) in N,N-dimethylformamide (10 ml) at room temperature. After stirring for 3 days, the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml), a saturated aqueous solution (150 ml) of sodium hydrogencarbonate and water (150 ml) were added to the residue. After collecting colorless precipitate formed was collected by filtration and dried to obtain the title compound (5.21 g) as a colorless solid. the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml) a saturated aqueous solution (150 ml) of sodium hydrogencarbonate and water (150 ml) were added to the residue After collecting colorless precipitate formed was collected by filtration dried

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

Procedure: 5-Chloroindole-2-carboxylic acid (2.88 g), 1-hydroxybenzotriazole monohydrate (2.08 g) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.95 g) were added to a solution of (±)-trans-N-tert-butoxycarbonyl-1,2-cyclohexanediamine (3.00 g) in N,N-dimethylformamide (10 ml) at room temperature. After stirring for 3 days, the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml), a saturated aqueous solution (150 ml) of sodium hydrogencarbonate and water (150 ml) were added to the residue. After collecting colorless precipitate formed was collected by filtration and dried to obtain the title compound (5.21 g) as a colorless solid. the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml) a saturated aqueous solution (150 ml) of sodium hydrogencarbonate and water (150 ml) were added to the residue After collecting colorless precipitate formed was collected by filtration dried

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

Procedure: (±)-trans-N-tert-Butoxycarbonyl-1,2-cyclohexane-diamine (642 mg) was dissolved in N,N-dimethylformamide (20 ml), and to the solution lithium 5-methyl-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine-2-carboxylate (795 mg), 1-hydroxybenzotriazole monohydrate (46 mg) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.30 g) were added, and the mixture was stirred overnight at room temperature. After the reaction mixture was concentrated under reduced pressure, and dichloromethane and water were added to the residue, the organic layer was taken out and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by column chromatography on silica gel (dichloromethane:methanol 100:3) to obtain a pale yellow foamy substance. This substance was dissolved in dichloromethane (5 ml), and trifluoroacetic acid (30 ml) was added, and the mixture was stirred at room temperature for 1 minute. The reaction mixture was concentrated under reduced pressure to obtain the title compound (731 mg) as a pale brown foamy substance. After the reaction mixture was concentrated under reduced pressure, and dichloromethane and water were added to the residue dried over anhydrous sodium sulfate The solvent was distilled off under reduced pressure the residue was purified by column chromatography on silica gel (dichloromethane:methanol 100:3) to obtain a pale yellow foamy substance the mixture was stirred at room temperature for 1 minute The reaction mixture was concentrated under reduced pressure

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

Procedure: 5-Chloroindole-2-carboxylic acid (2.88 g), 1-hydroxybenzotriazole monohydrate (2.08 g) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.95 g) were added to a solution of (±)-trans-N-tert-butoxycarbonyl-1,2-cyclohexanediamine (3.00 g) in N,N-dimethylformamide (10 ml) at room temperature. After stirring for 3 days, the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml), a saturated aqueous solution (150 ml) of sodium hydrogencarbonate and water (150 ml). were added to the residue. After collecting colorless precipitate formed was collected by filtration and dried to obtain the title compound (5.21 g) as a colorless solid. the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml) were added to the residue After collecting colorless precipitate formed was collected by filtration dried

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

Procedure: 5-Chloroindole-2-carboxylic acid (2.88 g), 1-hydroxybenzotriazole monohydrate (2.08 g) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.95 g) were added to a solution of (±)-trans-N-tert-butoxycarbonyl-1,2-cyclohexanediamine (3.00 g) in N,N-dimethylformamide (10 ml) at room temperature. After stirring for 3 days, the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml), a saturated aqueous solution (150 ml) of sodium hydrogencarbonate and water (150 ml). were added to the residue. After collecting colorless precipitate formed was collected by filtration and dried to obtain the title compound (5.21 g) as a colorless solid. the reaction mixture was concentrated under reduced pressure, and dichloromethane (30 ml) were added to the residue After collecting colorless precipitate formed was collected by filtration dried

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

Procedure: (±)-trans-N-tert-Butoxycarbonyl-1,2-cyclohexane-diamine (642 mg) was dissolved in N,N-dimethylformamide (20 ml), and to the solution lithium 5-methyl-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine-2-carboxylate (795 mg), 1-hydroxybenzotriazole monohydrate (46 mg) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.30 g) were added, and the mixture was stirred overnight at room temperature. After the reaction mixture was concentrated under reduced pressure, and dichloromethane and water were added to the residue, the organic layer was taken out and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by column chromatography on silica gel (dichloromethane:methanol=100:3) to obtain a pale yellow foamy substance. This substance was dissolved in dichloromethane (5 ml), and trifluoroacetic acid (30 ml) was added, and the mixture was stirred at room temperature for 1 minute. The reaction mixture was concentrated under reduced-pressure to obtain the title compound (731 mg) as a pale brown foamy substance. After the reaction mixture was concentrated under reduced pressure, and dichloromethane and water were added to the residue dried over anhydrous sodium sulfate The solvent was distilled off under reduced pressure the residue was purified by column chromatography on silica gel (dichloromethane:methanol=100:3) to obtain a pale yellow foamy substance the mixture was stirred at room temperature for 1 minute The reaction mixture was concentrated under reduced-pressure

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

Procedure: To a round bottom flask under argon was added 4-((1S,4R)-6-oxo-2-azabicyclo[2.2.1]heptan-2-yl)benzonitrile (272 mg, 1.282 mmol), tert-butyl (1R,2R)-2-aminocyclohexylcarbamate (330 mg, 1.538 mmol), CH2Cl2 (6.4 ml), solid anhydrous Na2SO4 (1 gm) and HOAc (1 drop). Argon was bubbled through the reaction mixture for 1 min and then the reaction was stirred under argon at rt for 1 hr. After this time, sodium triacetoxy borohydride (815 mg, 3.84 mmol) was added to the reaction which was then stirred at rt overnight. The reaction mixture was then diluted with CH2Cl2. The resulting solution was wash with saturated aqueous NaHCO3, water and saturated aqueous NaCl. The organic layer was separated, dried over MgSO4, filtered and concentrated. The resulting residue was purified using silica gel chromatography (ISCO system) eluting with a gradient of 0-100% EtOAc/Hex. The fractions containing the desired product were concentrated to give tert-butyl (1R,2R)-2-((1R,4R,6S)-2-(4-cyanophenyl)-2-azabicyclo[2.2.1]heptan-6-ylamino)cyclohexylcarbamate (466 mg, 1.135 mmol, 89% yield). Anal. Calcd. for C24H34N4O2 m/z 410.5, found: 411.3 (M+H)+; 1H NMR (500 MHz, CDCl3) δ ppm 7.45 (2 H, d, J=8.8 Hz), 6.55 (2 H, d, J=8.8 Hz), 4.26 (1 H, s), 3.65 (1 H, br. s.), 3.47-3.41 (1 H, m), 3.30 (1 H, dt, J=8.8, 3.0 Hz), 3.15 (1 H, d, J=8.8 Hz), 2.98 (1 H, d, J=8.2 Hz), 2.64 (1 H, s), 2.29-2.19 (2 H, m), 2.10-2.02 (1 H, m), 2.01-1.93 (1 H, m), 1.74-1.59 (4 H, m), 1.45-1.37 (1 H, m), 1.35 (9 H, s), 1.30-1.18 (2 H, m), 1.09- -0.93 (2 H, m), 0.90 (1 H, ddd, J=12.9, 3.8, 3.6 Hz). Argon was bubbled through the reaction mixture for 1 min was then stirred at rt overnight The resulting solution was wash with saturated aqueous NaHCO3, water and saturated aqueous NaCl The organic layer was separated dried over MgSO4 filtered concentrated The resulting residue was purified eluting with a gradient of 0-100% EtOAc/Hex The fractions containing the desired product were concentrated

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

Procedure: To a round bottom flask under argon was added 4-((1S,4R)-6-oxo-2-azabicyclo[2.2.1]heptan-2-yl)benzonitrile (272 mg, 1.282 mmol), tert-butyl (1R,2R)-2-aminocyclohexylcarbamate (330 mg, 1.538 mmol), CH2Cl2 (6.4 ml), solid anhydrous Na2SO4 (1 gm) and HOAc (1 drop). Argon was bubbled through the reaction mixture for 1 min and then the reaction was stirred under argon at rt for 1 hr. After this time, sodium triacetoxy borohydride (815 mg, 3.84 mmol) was added to the reaction which was then stirred at rt overnight. The reaction mixture was then diluted with CH2Cl2. The resulting solution was wash with saturated aqueous NaHCO3, water and saturated aqueous NaCl. The organic layer was separated, dried over MgSO4, filtered and concentrated. The resulting residue was purified using silica gel chromatography (ISCO system) eluting with a gradient of 0-100% EtOAc/Hex. The fractions containing the desired product were concentrated to give tert-butyl (1R,2R)-2-((1R,4R,6S)-2-(4-cyanophenyl)-2-azabicyclo[2.2.1]heptan-6-ylamino)cyclohexylcarbamate (466 mg, 1.135 mmol, 89% yield). Anal. Calcd. for C24H34N4O2 m/z 410.5, found: 411.3 (M+H)+; 1H NMR (500 MHz, CDCl3) δ ppm 7.45 (2 H, d, J=8.8 Hz), 6.55 (2 H, d, J=8.8 Hz), 4.26 (1 H, s), 3.65 (1 H, br. s.), 3.47-3.41 (1 H, m), 3.30 (1 H, dt, J=8.8, 3.0 Hz), 3.15 (1 H, d, J=8.8 Hz), 2.98 (1 H, d, J=8.2 Hz), 2.64 (1 H, s), 2.29-2.19 (2 H, m), 2.10-2.02 (1 H, m), 2.01-1.93 (1 H, m), 1.74-1.59 (4 H, m), 1.45-1.37 (1 H, m), 1.35 (9 H, s), 1.30-1.18 (2 H, m), 1.09- -0.93 (2 H, m), 0.90 (1 H, ddd, J=12.9, 3.8, 3.6 Hz). Argon was bubbled through the reaction mixture for 1 min was then stirred at rt overnight The resulting solution was wash with saturated aqueous NaHCO3, water and saturated aqueous NaCl The organic layer was separated dried over MgSO4 filtered concentrated The resulting residue was purified eluting with a gradient of 0-100% EtOAc/Hex The fractions containing the desired product were concentrated

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

Procedure: To a round bottom flask under argon was added 4-((1S,4R)-6-oxo-2-azabicyclo[2.2.1]heptan-2-yl)benzonitrile (272 mg, 1.282 mmol), tert-butyl (1R,2R)-2-aminocyclohexylcarbamate (330 mg, 1.538 mmol), CH2Cl2 (6.4 ml), solid anhydrous Na2SO4 (1 gm) and HOAc (1 drop). Argon was bubbled through the reaction mixture for 1 min and then the reaction was stirred under argon at rt for 1 hr. After this time, sodium triacetoxy borohydride (815 mg, 3.84 mmol) was added to the reaction which was then stirred at rt overnight. The reaction mixture was then diluted with CH2Cl2. The resulting solution was wash with saturated aqueous NaHCO3, water and saturated aqueous NaCl. The organic layer was separated, dried over MgSO4, filtered and concentrated. The resulting residue was purified using silica gel chromatography (ISCO system) eluting with a gradient of 0-100% EtOAc/Hex. The fractions containing the desired product were concentrated to give tert-butyl (1R,2R)-2-((1R,4R,6S)-2-(4-cyanophenyl)-2-azabicyclo[2.2.1]heptan-6-ylamino)cyclohexylcarbamate (466 mg, 1.135 mmol, 89% yield). Anal. Calcd. for C24H34N4O2 m/z 410.5, found: 411.3 (M+H)+; 1H NMR (500 MHz, CDCl3) δ ppm 7.45 (2 H, d, J=8.8 Hz), 6.55 (2 H, d, J=8.8 Hz), 4.26 (1 H, s), 3.65 (1 H, br. s.), 3.47-3.41 (1 H, m), 3.30 (1 H, dt, J=8.8, 3.0 Hz), 3.15 (1 H, d, J=8.8 Hz), 2.98 (1 H, d, J=8.2 Hz), 2.64 (1 H, s), 2.29-2.19 (2 H, m), 2.10-2.02 (1 H, m), 2.01-1.93 (1 H, m), 1.74-1.59 (4 H, m), 1.45-1.37 (1 H, m), 1.35 (9 H, s), 1.30-1.18 (2 H, m), 1.09- -0.93 (2 H, m), 0.90 (1 H, ddd, J=12.9, 3.8, 3.6 Hz). Argon was bubbled through the reaction mixture for 1 min was then stirred at rt overnight The resulting solution was wash with saturated aqueous NaHCO3, water and saturated aqueous NaCl The organic layer was separated dried over MgSO4 filtered concentrated The resulting residue was purified eluting with a gradient of 0-100% EtOAc/Hex The fractions containing the desired product were concentrated

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-(4-(oxazol-2-yl)phenyl)piperidin-3-yl methane sulfonate (110 mg, 0.341 mmol) in acetonitrile (4 mL) was added tert-butyl (1R,2R)-2-aminocyclohexylcarbamate (110 mg, 0.512 mmol). The reaction was stirred in a microwave at 120° C. for 30 min. After this time, LC/MS showed two pairs of products formed. The reaction mixture was concentrated. The residue was diluted with EtOAc and washed with water. The remaining EtOAc organic layer was concentrated. The resulting residue was purified using silica gel chromatography (ISCO system) eluting with a gradient of 50-100% EtOAc/Hex. Under these conditions, the two diastereomers separated and the desired diastereomer tert-butyl (1R,2R)-2-((1-(4-(oxazol-2-yl)phenyl)pyrrolidin-2-yl)methylamino)cyclohexylcarbamate (156 mg total) as a white foam. formed The reaction mixture was concentrated The residue was diluted with EtOAc washed with water The remaining EtOAc organic layer was concentrated The resulting residue was purified eluting with a gradient of 50-100% EtOAc/Hex Under these conditions, the two diastereomers separated

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-(4-(oxazol-2-yl)phenyl)piperidin-3-yl methane sulfonate (110 mg, 0.341 mmol) in acetonitrile (4 mL) was added tert-butyl (1R,2R)-2-aminocyclohexylcarbamate (110 mg, 0.512 mmol). The reaction was stirred in a microwave at 120° C. for 30 min. After this time, LC/MS showed two pairs of products formed. The reaction mixture was concentrated. The residue was diluted with EtOAc and washed with water. The remaining EtOAc organic layer was concentrated. The resulting residue was purified using silica gel chromatography (ISCO system) eluting with a gradient of 50-100% EtOAc/Hex. Under these conditions, the two diastereomers separated and the desired diastereomer tert-butyl (1R,2R)-2-((1-(4-(oxazol-2-yl)phenyl)pyrrolidin-2-yl)methylamino)cyclohexylcarbamate (156 mg total) as a white foam. formed The reaction mixture was concentrated The residue was diluted with EtOAc washed with water The remaining EtOAc organic layer was concentrated The resulting residue was purified eluting with a gradient of 50-100% EtOAc/Hex Under these conditions, the two diastereomers separated

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-(4-(oxazol-2-yl)phenyl)piperidin-3-yl methanesulfonate (110 mg, 0.341 mmol) in acetonitrile (4 mL) was added tert-butyl (1R,2R)-2-aminocyclohexylcarbamate (110 mg, 0.512 mmol). The reaction was stirred in a microwave at 120° C. for 30 min. After this time, LC/MS showed two pairs of products formed. The reaction was concentrated. The residue was diluted with EtOAc and washed with water. EtOAc extracts were concentrated. The resulting residue was purified using silica gel chromatography (ISCO system) eluting with a gradient of 50-100% EtOAc/Hex to give desired product tert-butyl (1R,2R)-2-((1-(4-(oxazol-2-yl)phenyl)pyrrolidin-2-yl)methylamino)cyclohexylcarbamate and the unwanted diastereomer, tert-butyl (1R,2S)-2-((1-(4-(oxazol-2-yl)phenyl)pyrrolidin-2-yl)methylamino)cyclohexylcarbamate (156 mg total) as a white foam. formed The reaction was concentrated The residue was diluted with EtOAc washed with water EtOAc extracts were concentrated The resulting residue was purified eluting with a gradient of 50-100% EtOAc/Hex