tert-butyl (2R)-pyrrolidine-2-carboxylate;hydrochloride

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

Procedure: A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.134 g, 0.46 mmol), D-proline tert-butyl ester hydrochloride (Bachem; 0.22 g, 1.1 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (Avocado; 0.18 g, 0.95 mmol), and N,N-dimethylaminopyridine (0.166 g, 1.36 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give 5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-D-pyrrolidine-2-carboxylic acid tert-butyl ester as a white solid (0.115 g, 56%). The solvents were evaporated under reduced pressure, and water and ethyl acetate were added The aqueous phase was extracted three times with ethyl acetate the combined organic layers were dried (sodium sulfate) filtered evaporated purified a Biotage Flash 40 purification system eluting with methylene chloride/acetone 9:1

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

Procedure: A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.134 g, 0.46 mmol), D-proline tert-butyl ester hydrochloride (Bachem; 0.22 g, 1.1 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (Avocado; 0.18 g, 0.95 mmol), and N,N-dimethylaminopyridine (0.166 g, 1.36 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give 5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-D-pyrrolidine-2-carboxylic acid tert-butyl ester as a white solid (0.115 g, 56%). The solvents were evaporated under reduced pressure, and water and ethyl acetate were added The aqueous phase was extracted three times with ethyl acetate the combined organic layers were dried (sodium sulfate) filtered evaporated purified a Biotage Flash 40 purification system eluting with methylene chloride/acetone 9:1

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

Procedure: A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.134 g, 0.46 mmol), D-proline tert-butyl ester hydrochloride (Bachem; 0.22 g, 1.1 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (Avocado; 0.18 g, 0.95 mmol), and N,N-dimethylaminopyridine (0.166 g, 1.36 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give 5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-D-pyrrolidine-2-carboxylic acid tert-butyl ester as a white solid (0.115 g, 56%). The solvents were evaporated under reduced pressure, and water and ethyl acetate were added The aqueous phase was extracted three times with ethyl acetate the combined organic layers were dried (sodium sulfate) filtered evaporated purified a Biotage Flash 40 purification system eluting with methylene chloride/acetone 9:1

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

Procedure: A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.134 g, 0.46 mmol), D-proline tert-butyl ester hydrochloride (Bachem; 0.22 g, 1.1 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (Avocado; 0.18 g, 0.95 mmol), and N,N-dimethylaminopyridine (0.166 g, 1.36 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give 5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-D-pyrrolidine-2-carboxylic acid tert-butyl ester as a white solid (0.115 g, 56%). The solvents were evaporated under reduced pressure, and water and ethyl acetate were added The aqueous phase was extracted three times with ethyl acetate the combined organic layers were dried (sodium sulfate) filtered evaporated purified a Biotage Flash 40 purification system eluting with methylene chloride/acetone 9:1

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

Procedure: A mixture of 4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoic acid (45 mg, 0.1 mmol), D-proline t-butyl ester hydrochloride (31 mg, 0.15 mmol), triethylamine (50 μL, 0.3 mmol), 1-hydroxy-7-azabenzotriazole (HOAT) (20 mg, 0.15 mmol), and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (30 mg, 0.15 mmol) in anhydrous dichloromethane (5 mL) and N,N-dimethylformamide (1.5 mL) was stirred at room temperature overnight. The reaction mixture was concentrated and purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane) to give (R)-1-(4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoyl)-pyrrolidine-2-carboxylic acid tert-butyl ester (51 mg, 84%) as a white solid. The reaction mixture was concentrated purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane)

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

Procedure: A mixture of 4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoic acid (45 mg, 0.1 mmol), D-proline t-butyl ester hydrochloride (31 mg, 0.15 mmol), triethylamine (50 μL, 0.3 mmol), 1-hydroxy-7-azabenzotriazole (HOAT) (20 mg, 0.15 mmol), and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (30 mg, 0.15 mmol) in anhydrous dichloromethane (5 mL) and N,N-dimethylformamide (1.5 mL) was stirred at room temperature overnight. The reaction mixture was concentrated and purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane) to give (R)-1-(4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoyl)-pyrrolidine-2-carboxylic acid tert-butyl ester (51 mg, 84%) as a white solid. The reaction mixture was concentrated purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane)

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

Procedure: A mixture of 4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoic acid (45 mg, 0.1 mmol), D-proline t-butyl ester hydrochloride (31 mg, 0.15 mmol), triethylamine (50 μL, 0.3 mmol), 1-hydroxy-7-azabenzotriazole (HOAT) (20 mg, 0.15 mmol), and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (30 mg, 0.15 mmol) in anhydrous dichloromethane (5 mL) and N,N-dimethylformamide (1.5 mL) was stirred at room temperature overnight. The reaction mixture was concentrated and purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane) to give (R)-1-(4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoyl)-pyrrolidine-2-carboxylic acid tert-butyl ester (51 mg, 84%) as a white solid. The reaction mixture was concentrated purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane)

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

Procedure: A mixture of 4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoic acid (45 mg, 0.1 mmol), D-proline t-butyl ester hydrochloride (31 mg, 0.15 mmol), triethylamine (50 μL, 0.3 mmol), 1-hydroxy-7-azabenzotriazole (HOAT) (20 mg, 0.15 mmol), and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (30 mg, 0.15 mmol) in anhydrous dichloromethane (5 mL) and N,N-dimethylformamide (1.5 mL) was stirred at room temperature overnight. The reaction mixture was concentrated and purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane) to give (R)-1-(4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoyl)-pyrrolidine-2-carboxylic acid tert-butyl ester (51 mg, 84%) as a white solid. The reaction mixture was concentrated purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane)

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

Procedure: A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.134 g, 0.46 mmol), D-proline tert-butyl ester hydrochloride (Bachem; 0.22 g, 1.1 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (Avocado; 0.18 g, 0.95 mmol), and N,N-dimethylaminopyridine (0.166 g, 1.36 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give 5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-D-pyrrolidine-2-carboxylic acid tert-butyl ester as a white solid (0.115 g, 56%). The solvents were evaporated under reduced pressure, and water and ethyl acetate were added The aqueous phase was extracted three times with ethyl acetate the combined organic layers were dried (sodium sulfate) filtered evaporated purified a Biotage Flash 40 purification system eluting with methylene chloride/acetone 9:1

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

Procedure: A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.134 g, 0.46 mmol), D-proline tert-butyl ester hydrochloride (Bachem; 0.22 g, 1.1 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (Avocado; 0.18 g, 0.95 mmol), and N,N-dimethylaminopyridine (0.166 g, 1.36 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give 5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-D-pyrrolidine-2-carboxylic acid tert-butyl ester as a white solid (0.115 g, 56%). The solvents were evaporated under reduced pressure, and water and ethyl acetate were added The aqueous phase was extracted three times with ethyl acetate the combined organic layers were dried (sodium sulfate) filtered evaporated purified a Biotage Flash 40 purification system eluting with methylene chloride/acetone 9:1

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

Procedure: A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.134 g, 0.46 mmol), D-proline tert-butyl ester hydrochloride (Bachem; 0.22 g, 1.1 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (Avocado; 0.18 g, 0.95 mmol), and N,N-dimethylaminopyridine (0.166 g, 1.36 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give 5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-D-pyrrolidine-2-carboxylic acid tert-butyl ester as a white solid (0.115 g, 56%). The solvents were evaporated under reduced pressure, and water and ethyl acetate were added The aqueous phase was extracted three times with ethyl acetate the combined organic layers were dried (sodium sulfate) filtered evaporated purified a Biotage Flash 40 purification system eluting with methylene chloride/acetone 9:1

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

Procedure: A mixture of 4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoic acid (45 mg, 0.1 mmol), D-proline t-butyl ester hydrochloride (31 mg, 0.15 mmol), triethylamine (50 μL, 0.3 mmol), 1-hydroxy-7-azabenzotriazole (HOAT) (20 mg, 0.15 mmol), and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (30 mg, 0.15 mmol) in anhydrous dichloromethane (5 mL) and N,N-dimethylformamide (1.5 mL) was stirred at room temperature overnight. The reaction mixture was concentrated and purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane) to give (R)-1-(4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoyl)-pyrrolidine-2-carboxylic acid tert-butyl ester (51 mg, 84%) as a white solid. The reaction mixture was concentrated purified by flash chromatography (Merck silica gel 60, 230-400 mesh, 0%-100% ethyl acetate in hexane)