azetidine-3-carbonitrile;hydrochloride

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

Procedure: This compound was prepared by using procedures analogous to those described for the synthesis of Example 54, Step 3 starting from 2-(4-{3-[3-({[(2,2,2-trifluoroethyl)amino]carbonyl}amino)phenyl]imidazo[1,2-b]pyridazin-7-yl}-1H-pyrazol-1-yl)propanoic acid and azetidine-3-carbonitrile hydrochloride (Asta Tech, Inc. and Cat. No. 52028). LCMS (M+H)+: m/z=538.2. This compound was prepared

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a 25 mL round-bottomed flask were mixed with stirring azetidine-3-carbonitrile hydrochloride (available from ASW MedChem. Inc., 250 mg, 2.11 mmol) and 1-bromo-3-chloropropane (664 mg, 415 μL, 4.22 mmol.0) in acetonitrile (5 mL) to the suspension was added Cs2CO3 (2.06 g, 6.33 mmol). The mixture was stirred at 25° C. for 18 h, then diluted with 15 mL of EtOAc and filtered to remove solids. Filtrate was evaporated and residue purified by chromatography (40 g column, 50 μm from Analogix, 0 to 5% over 20 min (MeOH containing 10% ammonium hydroxide)/dichloromethane (developing TLC in an iodine chamber) to give 1-(3-chloropropyl)azetidine-3-carbonitrile (230 mg, 1.45 mmol, 68.8%) as a clear dense liquid. 1H NMR (CDCl3) δ: 3.46-3.59 (m, 4H), 3.20-3.31 (m, 3H), 2.55 (t, J=6.8 Hz, 2H), 1.75 (quin, J=6.6 Hz, 2H). filtered to remove solids Filtrate was evaporated residue purified by chromatography (40 g column, 50 μm from Analogix, 0 to 5% over 20 min (MeOH containing 10% ammonium hydroxide)/dichloromethane (

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a 25 mL round-bottomed flask were mixed with stirring azetidine-3-carbonitrile hydrochloride (available from ASW MedChem. Inc., 250 mg, 2.11 mmol) and 1-bromo-3-chloropropane (664 mg, 415 μL, 4.22 mmol.0) in acetonitrile (5 mL) to the suspension was added Cs2CO3 (2.06 g, 6.33 mmol). The mixture was stirred at 25° C. for 18 h, then diluted with 15 mL of EtOAc and filtered to remove solids. Filtrate was evaporated and residue purified by chromatography (40 g column, 50 μm from Analogix, 0 to 5% over 20 min (MeOH containing 10% ammonium hydroxide)/dichloromethane (developing TLC in an iodine chamber) to give 1-(3-chloropropyl)azetidine-3-carbonitrile (230 mg, 1.45 mmol, 68.8%) as a clear dense liquid. 1H NMR (CDCl3) δ: 3.46-3.59 (m, 4H), 3.20-3.31 (m, 3H), 2.55 (t, J=6.8 Hz, 2H), 1.75 (quin, J=6.6 Hz, 2H). filtered to remove solids Filtrate was evaporated residue purified by chromatography (40 g column, 50 μm from Analogix, 0 to 5% over 20 min (MeOH containing 10% ammonium hydroxide)/dichloromethane (

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

Procedure: A 25 mL round-bottomed flask was charged with (R)-2-tert-butoxycarbonylamino-3-methoxy-propionic acid (0.475 g, 2.17 mmol), azetidine-3-carbonitrile hydrochloride (314 mg, 2.65 mmol) and HATU (832 mg, 2.19 mmol). Then added DMF (3.6 mL) followed by N,N-diisopropylethylamine (1.5 mL, 8.67 mmol). The reaction mixture was stirred at room temperature overnight then quenched with water and extracted with EtOAc (30 mL). The organic layer was washed once with saturated NaHCO3 and water. The combined aqueous layers were back extracted with EtOAc (25 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated. The residue was purified by chromatography over SiO2 with EtOAc/heptane (gradient: 0-100% EtOAc) to afford 288 mg (47%) of [(R)-2-(3-cyano-azetidin-1-yl)-1-methoxymethyl-2-oxo-ethyl]-carbamic acid tert-butyl ester as a viscous colorless oil. then quenched with water extracted with EtOAc (30 mL) The organic layer was washed once with saturated NaHCO3 and water The combined aqueous layers were back extracted with EtOAc (25 mL) The combined organic layers were dried over sodium sulfate filtered concentrated The residue was purified by chromatography over SiO2 with EtOAc/heptane (gradient: 0-100% EtOAc)

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

Procedure: A round-bottomed flask was charged with Boc-D-tert-leucine (300 mg, 1.3 mmol) and azetidine-3-carbonitrile hydrochloride (231 mg, 1.95 mmol). DMF (6 ml) was added followed by N,N-diisopropylethylamine (0.68 ml, 3.9 mmol) and HATU (543 mg, 1.43 mmol). The light yellow solution was stirred at room temperature for 48 h then quenched with water and extracted with diethyl ether (2×). The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate, filtered and concentrated to afford 458 mg of [(R)-1-(3-cyano-azetidine-1-carbonyl)-2,2-dimethyl-propyl]-carbamic acid tert-butyl ester as a light yellow oil. then quenched with water extracted with diethyl ether (2×) The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate filtered concentrated

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

Procedure: A round-bottomed flask was charged with Boc-D-tert-leucine (300 mg, 1.3 mmol) and azetidine-3-carbonitrile hydrochloride (231 mg, 1.95 mmol). DMF (6 ml) was added followed by N,N-diisopropylethylamine (0.68 ml, 3.9 mmol) and HATU (543 mg, 1.43 mmol). The light yellow solution was stirred at room temperature for 48 h then quenched with water and extracted with diethyl ether (2×). The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate, filtered and concentrated to afford 458 mg of [(R)-1-(3-cyano-azetidine-1-carbonyl)-2,2-dimethyl-propyl]-carbamic acid tert-butyl ester as a light yellow oil. then quenched with water extracted with diethyl ether (2×) The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate filtered concentrated

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

Procedure: In a round-bottomed flask Boc-D-cyclopropylglycine (500 mg, 2.32 mmol) and azetidine-3-carbonitrile hydrochloride (441 mg, 3.72 mmol) were dissolved in DMF (10 ml). N,N-Diisopropylethylamine (1.2 ml, 6.87 mmol) was added followed by HATU (972 mg, 2.56 mmol). The reaction mixture was stirred at room temperature overnight then quenched with water and extracted with diethyl ether (2×). The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate, filtered and concentrated. The residue was triturated with petroleum ether to afford 384 mg (59%) of [(R)-2-(3-cyano-azetidin-1-yl)-1-cyclopropyl-2-oxo-ethyl]-carbamic acid tert-butyl ester as an off-white solid. then quenched with water extracted with diethyl ether (2×) The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate filtered concentrated The residue was triturated with petroleum ether

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

Procedure: In a round-bottomed flask Boc-D-2-aminobutyric acid (400 mg, 1.97 mmol) and azetidine-3-carbonitrile hydrochloride (373 mg, 3.15 mmol) were dissolved in DMF (9 ml). N,N-Diisopropylethylamine (1.0 ml, 5.73 mmol) was added followed by HATU (823 mg, 2.16 mmol). The reaction mixture was stirred at room temperature for 48 h then quenched with water and extracted with diethyl ether (2×). The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate, filtered and concentrated to provide 410 mg (70%) of [(R)-1-(3-cyano-azetidine-1-carbonyl)-propyl]-carbamic acid tert-butyl ester as an off-white solid. then quenched with water extracted with diethyl ether (2×) The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate filtered concentrated

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

Procedure: In a round-bottomed flask Boc-D-2-aminobutyric acid (400 mg, 1.97 mmol) and azetidine-3-carbonitrile hydrochloride (373 mg, 3.15 mmol) were dissolved in DMF (9 ml). N,N-Diisopropylethylamine (1.0 ml, 5.73 mmol) was added followed by HATU (823 mg, 2.16 mmol). The reaction mixture was stirred at room temperature for 48 h then quenched with water and extracted with diethyl ether (2×). The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate, filtered and concentrated to provide 410 mg (70%) of [(R)-1-(3-cyano-azetidine-1-carbonyl)-propyl]-carbamic acid tert-butyl ester as an off-white solid. then quenched with water extracted with diethyl ether (2×) The combined organic layers were washed twice with water and once with brine then dried over sodium sulfate filtered concentrated

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

Procedure: In a round-bottomed flask were combined Boc-D-alanine (500 mg, 2.64 mmol), azetidine-3-carbonitrile hydrochloride (376 mg, 3.17 mmol), HOBT (445 mg, 2.91 mmol) and HATU (1.11 g, 2.91 mmol). Then added DMF (5 mL) followed by N,N-diisopropylethylamine (1.38 mL, 7.93 mmol). The yellow reaction mixture was stirred at room temperature for 3 h then quenched with water and extracted with EtOAc (3×). The combined organics were washed with water (3×) dried over MgSO4 and concentrated. The residue was purified by SiO2 chromatography (50% to 100% EtOAc/hexanes) to afford 493 mg (74%) of [(R)-2-(3-cyanoazetidin-1-yl)-1-methyl-2-oxo-ethyl]-carbamic acid tert-butyl ester as a white solid. In a round-bottomed flask were combined then quenched with water extracted with EtOAc (3×) The combined organics were washed with water (3×) dried over MgSO4 concentrated The residue was purified by SiO2 chromatography (50% to 100% EtOAc/hexanes)

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

Procedure: In a round-bottomed flask were combined Boc-D-alanine (500 mg, 2.64 mmol), azetidine-3-carbonitrile hydrochloride (376 mg, 3.17 mmol), HOBT (445 mg, 2.91 mmol) and HATU (1.11 g, 2.91 mmol). Then added DMF (5 mL) followed by N,N-diisopropylethylamine (1.38 mL, 7.93 mmol). The yellow reaction mixture was stirred at room temperature for 3 h then quenched with water and extracted with EtOAc (3×). The combined organics were washed with water (3×) dried over MgSO4 and concentrated. The residue was purified by SiO2 chromatography (50% to 100% EtOAc/hexanes) to afford 493 mg (74%) of [(R)-2-(3-cyanoazetidin-1-yl)-1-methyl-2-oxo-ethyl]-carbamic acid tert-butyl ester as a white solid. In a round-bottomed flask were combined then quenched with water extracted with EtOAc (3×) The combined organics were washed with water (3×) dried over MgSO4 concentrated The residue was purified by SiO2 chromatography (50% to 100% EtOAc/hexanes)

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

Procedure: A solution of 1-Benzhydryl-azetidine-3-carbonitrile (0.25 g, 1.0 mmol) in dichloromethane (2 ml) is treated with 1-chloroethylchloroformate (0.12 ml, 1.1 mmol). The reaction mixture is stirred at room temperature for 3 hours, the solvent evaporated and the residue taken-up in methanol and refluxed for 1 hour. The reaction mixture is cooled to room temperature and stirred for a further 18 hours. The solvent is evaporated to afford crude azetidine-3-carbonitrile hydrochloride. The crude azetidine-3-carbonitrile is dissolved in dichloromethane (3 ml) and treated with triethylamine (0.25 ml, 2.0 mmol) and 3,4-dichlorobenzylbromide (0.24 g, 1.0 mmol). The reaction mixture is stirred at ambient temperature for 2 hours, then washed with water, the organic phase dried over magnesium sulphate and evaporated. The crude product is purified by chromatography over flash silica using hexane:ethylacetate 2:1 as eluent to afford 1-(3,4-Dichloro-benzyl)-azetidine-3-carbonitrile. [MH]+ 240.97 washed with water the organic phase dried over magnesium sulphate evaporated The crude product is purified by chromatography over flash silica