4-piperidin-4-yl-1,4-benzoxazin-3-one

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-[1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1H-pyrazol-4-yl]-pyrazine (76 mg, 0.220 mmol) and 4-piperidin-4-yl-4H-benzo[1,4]oxazin-3-one (61 mg, 0.231 mmol) in EtOH (1.1 mL) was added triethylamine (0.031 mL, 0.220 mmol). The reaction mixture was heated to 80° C. overnight, concentrated, and purified by column chromatography (silica, 5-10% MeOH/CH2Cl2) to afford 4-(1-{2-hydroxy-3-[4-pyrazin-2-yl-3-(4-trifluoromethyl-phenyl)-pyrazol-1-yl]-propyl}-piperidin-4-yl)-4H-benzo[1,4]oxazin-3-one (27 mg, 21%). TLC (silica, 5% MeOH/CH2Cl2): Rf=0.09. MS (electrospray): m/z 579.2 (579.2, calculated for C30H29F3N6O3, M++H). 1H NMR (400 MHz, CDCl3): 8.53 (s, 1H), 8.48 (s, 1H), 8.40 (s, 1H), 8.11 (s, 1H), 7.73 (d, J=8.2 Hz, 2H), 7.63 (d, J=8.2 Hz, 2H), 7.16 (d, J=5.4 Hz, 1H), 7.00-7.03 (m, 3H), 4.49 (s, 2H), 4.39 (d, J=10.8 Hz, 1H), 3.13 (d, J=11.9 Hz, 1H), 2.96 (d, J=11.9 Hz, 1H), 2.59-2.80 (m, 2H), 2.40-2.55 (m, 3H), 2.17 (t, J=11.9 Hz, 1H),1.77 (d, J=11.9 Hz, 2H). concentrated purified by column chromatography (silica, 5-10% MeOH/CH2Cl2)

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

Procedure: 4-(3-Oxo-2,3-dihydro-benzo[1,4]oxazin-4-yl)-piperidine-1-carboxylic acid tert-butyl ester (17 g, 51 mmol) and 1:1 TFA/CH2Cl2 (40 mL) were combined and set stirring. After 45 min the mixture was evaporated to give a clear brown oil. The oil was set stirring and Et2O was added (300 mL). A solid formed and was filtered, washed with Et2O and air dried to give 16 g (90%) of a light beige solid. MS (electrospray): exact mass calculated for C13H16N2O2, 232.12. m/z found, 233.1 [M+H]+. 1H NMR (400 MHz, CD3OD): 7.44 (dd, J=6.5, 1.4 Hz, 1H), 7.20-7.7.10 (m, 3H), 4.58 (s, 2H), 4.55-4.45 (m, 1H), 4.65-4.55 (m, 2H), 3.27 (dt, J=13.0, 2.3 Hz, 2H), 3.05 (dd, J=12.3, 4.1 Hz, 2H), 2.15 (d, J=13.8 Hz, 2H). After 45 min the mixture was evaporated to give a clear brown oil The oil was set stirring A solid formed was filtered washed with Et2O and air dried

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: 4-(1-tert-butyloxycarbonyl-4-piperidinyl)-(2H)-1,4-benzoxazin-3(4H)-one from Step 4 was N-deprotedcted with HCl in EtOAc using the procedure given in Step 4 of Example 1. The hydrochloride salt of 4-(4-piperidinyl)-(2H)-1,4-benzoxazin-3(4H)-one was obtained as a solid (95% yield).

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-[1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1H-pyrazol-4-yl]-pyrazine (76 mg, 0.220 mmol) and 4-piperidin-4-yl-4H-benzo[1,4]oxazin-3-one (61 mg, 0.231 mmol) in EtOH (1.1 mL) was added triethylamine (0.031 mL, 0.220 mmol). The reaction mixture was heated to 80° C. overnight, concentrated, and purified by column chromatography (silica, 5-10% MeOH/CH2Cl2) to afford 4-(1-{2-hydroxy-3-[4-pyrazin-2-yl-3-(4-trifluoromethyl-phenyl)-pyrazol-1-yl]-propyl}-piperidin-4-yl)-4H-benzo[1,4]oxazin-3-one (27 mg, 21%). TLC (silica, 5% MeOH/CH2Cl2): Rf=0.09. MS (electrospray): m/z 579.2 (579.2, calculated for C30H29F3N6O3, M++H). 1H NMR (400 MHz, CDCl3): 8.53 (s, 1H), 8.48 (s, 1H), 8.40 (s, 1H), 8.11 (s, 1H), 7.73 (d, J=8.2 Hz, 2H), 7.63 (d, J=8.2 Hz, 2H), 7.16 (d, J=5.4 Hz, 1H), 7.00-7.03 (m, 3H), 4.49 (s, 2H), 4.39 (d, J=10.8 Hz, 1H), 3.13 (d, J=11.9 Hz, 1H), 2.96 (d, J=11.9 Hz, 1H), 2.59-2.80 (m, 2H), 2.40-2.55 (m, 3H), 2.17 (t, J=11.9 Hz, 1H), 1.77 (d, J=11.9 Hz, 2H). concentrated purified by column chromatography (silica, 5-10% MeOH/CH2Cl2)

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-[1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1H-pyrazol-4-yl]-pyrazine (76 mg, 0.220 mmol) and 4-piperidin-4-yl-4H-benzo[1,4]oxazin-3-one (61 mg, 0.231 mmol) in EtOH (1.1 mL) was added triethylamine (0.031 mL, 0.220 mmol). The reaction mixture was heated to 80° C. overnight, concentrated, and purified by column chromatography (silica, 5-10% MeOH/CH2Cl2) to afford 4-(1-{2-hydroxy-3-[4-pyrazin-2-yl-3-(4-trifluoromethyl-phenyl)-pyrazol-1-yl]-propyl}-piperidin-4-yl)-4H-benzo[1,4]oxazin-3-one (27 mg, 21%). TLC (silica, 5% MeOH/CH2Cl2): Rf=0.09. MS (electrospray): m/z 579.2 (579.2, calculated for C30H29F3N6O3, M++H). 1H NMR (400 MHz, CDCl3): 8.53 (s, 1H), 8.48 (s, 1H), 8.40 (s, 1H), 8.11 (s, 1H), 7.73 (d, J=8.2 Hz, 2H), 7.63 (d, J=8.2 Hz, 2H), 7.16 (d, J=5.4 Hz, 1H), 7.00-7.03 (m, 3H), 4.49 (s, 2H), 4.39 (d, J=10.8 Hz, 1H), 3.13 (d, J=11.9 Hz, 1H), 2.96 (d, J=11.9 Hz, 1H), 2.59-2.80 (m, 2H), 2.40-2.55 (m, 3H), 2.17 (t, J=11.9 Hz, 1H),1.77 (d, J=11.9 Hz, 2H). concentrated purified by column chromatography (silica, 5-10% MeOH/CH2Cl2)

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

Procedure: 4-(3-Oxo-2,3-dihydro-benzo[1,4]oxazin-4-yl)-piperidine-1-carboxylic acid tert-butyl ester (17 g, 51 mmol) and 1:1 TFA/CH2Cl2 (40 mL) were combined and set stirring. After 45 min the mixture was evaporated to give a clear brown oil. The oil was set stirring and Et2O was added (300 mL). A solid formed and was filtered, washed with Et2O and air dried to give 16 g (90%) of a light beige solid. MS (electrospray): exact mass calculated for C13H16N2O2, 232.12. m/z found, 233.1 [M+H]+. 1H NMR (400 MHz, CD3OD): 7.44 (dd, J=6.5, 1.4 Hz, 1H), 7.20-7.7.10 (m, 3H), 4.58 (s, 2H), 4.55-4.45 (m, 1H), 4.65-4.55 (m, 2H), 3.27 (dt, J=13.0, 2.3 Hz, 2H), 3.05 (dd, J=12.3, 4.1 Hz, 2H), 2.15 (d, J=13.8 Hz, 2H). After 45 min the mixture was evaporated to give a clear brown oil The oil was set stirring A solid formed was filtered washed with Et2O and air dried