(2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile

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

Procedure: To a stirred mixture of 1-[4-(1,1-dioxidoisothiazolidin-2-yl)phenyl]tricyclo[3.3.1.03,7]nonan-3-amine (as obtained in example 8 Step II) (0.17 g, 0.5 mmol) and K2CO3 (0.21 g, 1.5 mmol) in DMSO (2 mL) at an ice bath temperature was added (2S,4S)-1-(chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile (0.1 g, 0.5 mmol). The reaction mixture was gradually warmed to room temperature and stirred for 3 h. Upon completion of the reaction (checked by TLC), the reaction mixture was diluted with EtOAc and washed with water and brine, dried over Na2SO4, and the solvent was removed under reduced pressure. The crude product was purified by column chromatography to obtain (2S,4S)-1-{N-[2-[4-(1,1-dioxidoisothiazolidin-2-yl)phenyl]hexahydro-2,5-methanopentalen-3a(1H)-yl]glycyl}-4-fluoropyrrolidine-2-carbonitrile as an off-white powder (0.09 g) in 37% yield as a 3:1 mixture of two rotomers. IR cm−1 3438, 2953, 2776, 1673, 1518, 1427, 1301, 1135, 1078, 955; m/z (M+1) 487; 1H NMR (CDCl3) 300 MHz δ 7.25 (d, J=6.2 Hz, 2H), 7.20 (d, J=8.6 Hz, 2H), 5.42 (d (br), J=51.0 Hz, 0.8H), 5.34 (d (br), J=50.4 Hz, 0.2H), 5.15 (d, J=10.2 Hz, 0.2H), 4.98 (d, J=7.4 Hz, 0.8H), 4.0-3.50 (m, 4H), 3.76 (t, J=6.5H, 2H), 3.35 (t, J=6.5 Hz, 2H), 2.80-2.28 (m, 6H), 2.15-1.58 (m, 10H). Upon completion of the reaction (checked by TLC) washed with water and brine dried over Na2SO4 the solvent was removed under reduced pressure The crude product was purified by column chromatography

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

Procedure: A suspension of 1.4 g of (2S,4S)-4-fluoropyrrolidine-2-carboxamide monohydrochloride prepared according to the similar method as that described in a patent reference (International Publication WO02/38451 pamphlet), and 3.0 ml of N,N-diisopropylethylamine in 10 ml of chloroform was added dropwise to a solution of 0.73 ml of chloroacetyl chloride in 14 ml of chloroform under cooling with an ice-water bath, and the reaction mixture was stirred for 30 minutes under cooling with an ice-water bath. Then, the reaction mixture was concentrated under reduced pressure. To a solution of the resulting residue in 14 ml of chloroform, 2.4 ml of trifluoroacetic anhydride was added dropwise under cooling with an ice-water bath. Then, the reaction mixture was allowed to room temperature, and stirred for 1 hour. This was concentrated under reduced pressure, and 0.1 M hydrochloric acid was added to the resulting residue, and this was then extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate. The drying agent was removed, and the solvent was removed under reduced pressure. The resulting residue was purified with silica gel column chromatography (eluent: chloroform to chloroform/methanol=30/1) to obtain 0.84 g of (2S,4S)-1-(chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile. prepared under cooling with an ice-water bath under cooling with an ice-water bath Then, the reaction mixture was concentrated under reduced pressure To a solution of the resulting residue in 14 ml of chloroform, 2.4 ml of trifluoroacetic anhydride was added dropwise under cooling with an ice-water bath was allowed to room temperature stirred for 1 hour This was concentrated under reduced pressure, and 0.1 M hydrochloric acid was added to the resulting residue this was then extracted with ethyl acetate The organic layer was dried over anhydrous magnesium sulfate The drying agent was removed the solvent was removed under reduced pressure The resulting residue was purified with silica gel column chromatography (eluent: chloroform to chloroform/methanol=30/1)

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

Procedure: According to the production process of (2S,4S)-1-(2-bromoacetyl)-4-fluoropyrrolidine-2-carbonitrile described in WO 02/38541 pamphlet, (2S,4S)-4-fluoropyrrolidine-2-carboxamide hydrochloride (5.00 g) and chloroacetyl chloride (2.60 mL) were used to obtain (2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile (4.96 g).

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

Procedure: A solution of step 3 intermediate (10 g, 32.89 mmol) and triethylamine (4.32 g, 42.77 mmol) in dichloromethane (200 ml) was added drop wise to a stirred and cooled (0° C.) solution of chloroacetyl chloride (4.81 g, 32.95 mmol) in dichloromethane (50 ml) over a period of 10 min. The mixture was stirred at the same temperature for 2 h and diluted with dichloromethane (100 ml) and water (100 ml) under stirring. The layers were separated. The organic layer was washed with water (2×50 ml), brine (50 ml) and dried (Na2SO4). The residue obtained after evaporation of the solvent was triturated with diethyl ether to give 5.89 g (94%) of the product as an off-white solid, IR (KBr) 2924, 2241, 1678, 1407, 1281, 1225, 1076, 1051, 958 cm−1; 1H NMR (CDCl3, 300 MHz) δ 2.26-2.48 (m, 1H), 2.66-2.80 (m, 1H), 4.06 (s, 2H), 3.81-4.29 (m, 2H), 4.95 (d, J=9.6 Hz, 0.8H, rotomer), 5.38 (brd, J=51.3 Hz, 0.2H, rotomer) 5.46 (d, J=9.0 Hz, 0.2H, rotomer), 5.46 (dt, J=44.4, 3.3 Hz, 0.8H, rotomer). The mixture was stirred at the same temperature for 2 h under stirring The layers were separated The organic layer was washed with water (2×50 ml), brine (50 ml) dried (Na2SO4) The residue obtained after evaporation of the solvent was triturated with diethyl ether

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

Procedure: A solution of step 3 intermediate (10 g, 32.89 mmol) and triethylamine (4.32 g, 42.77 mmol) in dichloromethane (200 ml) was added drop wise to a stirred and cooled (0° C.) solution of chloroacetyl chloride (4.81 g, 32.95 mmol) in dichloromethane (50 ml) over a period of 10 min. The mixture was stirred at the same temperature for 2 h and diluted with dichloromethane (100 ml) and water (100 ml) under stirring. The layers were separated. The organic layer was washed with water (2×50 ml), brine (50 ml) and dried (Na2SO4). The residue obtained after evaporation of the solvent was triturated with diethyl ether to give 5.89 g (94%) of the product as an off-white solid, IR (KBr) 2924, 2241, 1678, 1407, 1281, 1225, 1076, 1051, 958 cm−1; 1H NMR (CDCl3, 300 MHz) δ 2.26-2.48 (m, 1H), 2.66-2.80 (m, 1H), 4.06 (s, 2H), 3.81-4.29 (m, 2H), 4.95 (d, J=9.6 Hz, 0.8H, rotomer), 5.38 (brd, J=51.3 Hz, 0.2H, rotomer) 5.46 (d, J=9.0 Hz, 0.2H, rotomer), 5.46 (dt, J=44.4, 3.3 Hz, 0.8H, rotomer). The mixture was stirred at the same temperature for 2 h under stirring The layers were separated The organic layer was washed with water (2×50 ml), brine (50 ml) dried (Na2SO4) The residue obtained after evaporation of the solvent was triturated with diethyl ether

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

Procedure: To a mixture of (2,4,6-Trimethyltetrahydro-2H-pyran-4-yl)amine obtained in Example 9-4 (900 mg) and K2CO3 (1.2 g) in tetrahydrofuran (10 mL) cooled on an ice bath, were added (2S,4S)-1-(chloroacetyl)-4-fluoro-2-pyrrolidinecarbonitrile obtained in Example 7-11 (700 mg) and a catalytic amount of NaI. The reaction mixture was warmed to room temperature and stirred for 65 hrs. cooled on an ice bath

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

Procedure: According to the process for producing (2S,4S)-1-(2-bromoacetyl)-4-fluoropyrrolidine-2-carbonitrile described in the publication of WO 02/38541, (2S,4S)-4-fluoropyrrolidine-2-carboxamide hydrochloride (5.00 g) and chloroacetylchloride (2.60 mL) were used to give (2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile (4.96 g).

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

Procedure: According to the process for producing (2S,4S)-1-(2-bromoacetyl)-4-fluoropyrrolidine-2-carbonitrile described in the publication of WO 02/38541, (2S,4S)-4-fluoropyrrolidine-2-carboxamide hydrochloride (5.00 g) and chloroacetylchloride (2.60 mL) were used to give (2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile (4.96 g).

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

Procedure: According to the production process of (2S,4S)-1-(2-bromoacetyl)-4-fluoropyrrolidine-2-carbonitrile described in WO 02/38541 pamphlet, (2S,4S)-4-fluoropyrrolidine-2-carboxamide hydrochloride (5.00 g) and chloroacetyl chloride (2.60 mL) were used to obtain (2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile (4.96 g).

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

Procedure: According to the process for producing (2S,4S)-1-(2-bromoacetyl)-4-fluoropyrrolidine-2-carbonitrile described in WO02/38541 pamphlet, (2S,4S)-4-fluoropyrrolidine-2-carboxamide hydrochloride (5.00 g) and chloroacetylchloride (2.60 mL) were used to obtain (2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile (4.96 g).

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

Procedure: 5-Amino-5-methyl-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide 11c (1.3 g, 7.58 mmol), (2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile 13g (1.74 g, 9.1 mmol), potassium carbonate (1.26 g, 9.1 mmol), 30 mL of N,N-dimethylformamide and 18 mL of dichloromethane were added to a flask under nitrogen atmosphere. The reaction mixture was reacted for overnight at 30° C. upon heating by an oil bath. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was concentrated to remove N,N-dimethylformamide. The resulting residue was purified by silica gel column chromatography to obtain the title compound 5-[2-((2S,4S)-2-cyano-4-fluoro-pyrrolidin-1-yl)-2-oxo-ethylamino]-5-methyl-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide 18a (1.39 g, yield 50%) as a white solid. The reaction mixture was reacted for overnight at 30° C. upon heating by an oil bath The mixture was concentrated to remove N,N-dimethylformamide The resulting residue was purified by silica gel column chromatography

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

Procedure: 5-Amino-5-benzyl-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide 14f (0.1 g, 0.35 mmol) was dissolved in 4 mL of the solvent mixture of dichloromethane/N,N-dimethylformamide (V/V=1/1) followed by addition of (2S,4S)-1-(2-chloroacetyl)-4-fluoropyrrolidine-2-carbonitrile 13g (66.5 mg, 0.35 mmol) and potassium carbonate (49 mg, 0.35 mmol). The reaction mixture was reacted at 40° C. for 12 hours. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was concentrated, and the resulting residue was purified by silica gel column chromatography to obtain the title compound 5-benzyl-5-[(2-((2S,4S)-2-cyano-4-fluoro-pyrrolidin-1-yl)-2-oxo-ethylamino]-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide 14g (87 mg, yield 56%) as a white solid. The reaction mixture was reacted at 40° C. for 12 hours The mixture was concentrated the resulting residue was purified by silica gel column chromatography