3-bromooxan-4-one

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

Procedure: To the stirred suspension of ethyl 5-hydroxy-1H-pyrazole-3-carboxylate (7.0 g, 45 mmol) and 24.9 g g of potassium carbonate in 500 ml of acetonitrile was added 8.0 g of 3-bromo-tetrahydro-pyran-4-one, and refluxed for 16 hours. The reaction mixture was allowed to cool to room temperature, then filtered, the solid was washed with acetonitrile. The filtrate was concentrated to an oil. The residue was dissolved in ethyl acetate and extracted with water. The organic phase was dried over MgSO4 and evaporated to dryness. 9.0 g (78%) of the desired product was obtained as a white solid. M.Pt. 121-123° C.; (M+H) 255. refluxed for 16 hours filtered the solid was washed with acetonitrile The filtrate was concentrated to an oil The residue was dissolved in ethyl acetate extracted with water The organic phase was dried over MgSO4 evaporated to dryness

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

Procedure: To the stirred suspension of ethyl 5-hydroxy-1H-pyrazole-3-carboxylate (7.0 g, 45 mmol) and 24.9 g g of potassium carbonate in 500 ml of acetonitrile was added 8.0 g of 3-bromo-tetrahydro-pyran-4-one, and refluxed for 16 hours. The reaction mixture was allowed to cool to room temperature, then filtered, the solid was washed with acetonitrile. The filtrate was concentrated to an oil. The residue was dissolved in ethyl acetate and extracted with water. The organic phase was dried over MgSO4 and evaporated to dryness. 9.0 g (78%) of the desired product was obtained as a white solid. M.Pt. 121-123° C.; (M+H) 255. refluxed for 16 hours filtered the solid was washed with acetonitrile The filtrate was concentrated to an oil The residue was dissolved in ethyl acetate extracted with water The organic phase was dried over MgSO4 evaporated to dryness

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

Procedure: To a solution of methyl 5-carbamothioyl-2,4-dimethylbenzoate (compound 130.1, 500 mg, 2.24 mmol, 1.00 equiv) in ethanol (5 mL) was added sodium bicarbonate (396 mg, 4.71 mmol, 1.00 equiv) and 3-bromodihydro-2H-pyran-4(3H)-one (compound 1.10.1, 186 mg, 1.04 mmol, 1.00 equiv). The resulting solution was stiffed overnight at 80° C. under nitrogen. After cooling to room temperature the mixture was concentrated under reduced pressure. The residue was taken up 10 mL of water and ethyl acetate. The aqueous phase was extracted with 2×20 mL of ethyl acetate and the combined organic layers were dried (MgSO4), and concentrated under reduced pressure to yield 400 mg (56%) of the title compound as a yellow solid. was concentrated under reduced pressure The aqueous phase was extracted with 2×20 mL of ethyl acetate the combined organic layers were dried (MgSO4) concentrated under reduced pressure

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

Procedure: To a solution of methyl 5-carbamothioyl-2,4-dimethylbenzoate (compound 130.1, 500 mg, 2.24 mmol, 1.00 equiv) in ethanol (5 mL) was added sodium bicarbonate (396 mg, 4.71 mmol, 1.00 equiv) and 3-bromodihydro-2H-pyran-4(3H)-one (compound 1.10.1, 186 mg, 1.04 mmol, 1.00 equiv). The resulting solution was stiffed overnight at 80° C. under nitrogen. After cooling to room temperature the mixture was concentrated under reduced pressure. The residue was taken up 10 mL of water and ethyl acetate. The aqueous phase was extracted with 2×20 mL of ethyl acetate and the combined organic layers were dried (MgSO4), and concentrated under reduced pressure to yield 400 mg (56%) of the title compound as a yellow solid. was concentrated under reduced pressure The aqueous phase was extracted with 2×20 mL of ethyl acetate the combined organic layers were dried (MgSO4) concentrated under reduced pressure

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

Procedure: A mixture of methyl 3-carbamimidoyl-4-methylbenzoate (compound 1.9, 400 mg, 1.98 mmol, 1.00 equiv, 95%), 3-bromodihydro-2H-pyran-4(3H)-one (compound 1.10.1, 750 mg, 2.09 mmol, 1.00 equiv), and potassium carbonate (580 mg, 4.20 mmol, 2.00 equiv) in CH3CN (15 mL) was stirred overnight at 80° C. under nitrogen. After cooling to ambient temperature, the reaction mixture was concentrated under reduced pressure. The residue was dissolved in 50 mL of ethyl acetate and washed with 2×10 mL of H2O. The organic phase was dried over (Na2SO4) and concentrated under reduced pressure. The residue was purified using silica gel column chromatography and purified using ethyl acetate/petroleum ether (1/3) to yield 0.21 g (37%) of the title compound as a white solid. After cooling to ambient temperature the reaction mixture was concentrated under reduced pressure The residue was dissolved in 50 mL of ethyl acetate washed with 2×10 mL of H2O The organic phase was dried over (Na2SO4) concentrated under reduced pressure The residue was purified purified

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

Procedure: To the stirred suspension of ethyl 5-hydroxy-1H-pyrazole-3-carboxylate (7.0 g, 45 mmol) and 24.9 g g of potassium carbonate in 500 ml of acetonitrile was added 8.0 g of 3-bromo-tetrahydro-pyran-4-one, and refluxed for 16 hours. The reaction mixture was allowed to cool to room temperature, then filtered, the solid was washed with acetonitrile. The filtrate was concentrated to an oil. The residue was dissolved in ethyl acetate and extracted with water. The organic phase was dried over MgSO4 and evaporated to dryness. 9.0 g (78%) of the desired product was obtained as a white solid. M.Pt. 121–123° C.; (M+H) 255. refluxed for 16 hours filtered the solid was washed with acetonitrile The filtrate was concentrated to an oil The residue was dissolved in ethyl acetate extracted with water The organic phase was dried over MgSO4 evaporated to dryness

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

Procedure: To the stirred suspension of ethyl 5-hydroxy-1H-pyrazole-3-carboxylate (7.0 g, 45 mmol) and 24.9 g g of potassium carbonate in 500 ml of acetonitrile was added 8.0 g of 3-bromo-tetrahydro-pyran-4-one, and refluxed for 16 hours. The reaction mixture was allowed to cool to room temperature, then filtered, the solid was washed with acetonitrile. The filtrate was concentrated to an oil. The residue was dissolved in ethyl acetate and extracted with water. The organic phase was dried over MgSO4 and evaporated to dryness. 9.0 g (78%) of the desired product was obtained as a white solid. M.Pt. 121-123° C.; (M+H) 255. refluxed for 16 hours filtered the solid was washed with acetonitrile The filtrate was concentrated to an oil The residue was dissolved in ethyl acetate extracted with water The organic phase was dried over MgSO4 evaporated to dryness

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

Procedure: To a solution of methyl 5-carbamothioyl-2,4-dimethylbenzoate (compound 130.1, 500 mg, 2.24 mmol, 1.00 equiv) in ethanol (5 mL) was added sodium bicarbonate (396 mg, 4.71 mmol, 1.00 equiv) and 3-bromodihydro-2H-pyran-4(3H)-one (compound 1.10.1, 186 mg, 1.04 mmol, 1.00 equiv). The resulting solution was stiffed overnight at 80° C. under nitrogen. After cooling to room temperature the mixture was concentrated under reduced pressure. The residue was taken up 10 mL of water and ethyl acetate. The aqueous phase was extracted with 2×20 mL of ethyl acetate and the combined organic layers were dried (MgSO4), and concentrated under reduced pressure to yield 400 mg (56%) of the title compound as a yellow solid. was concentrated under reduced pressure The aqueous phase was extracted with 2×20 mL of ethyl acetate the combined organic layers were dried (MgSO4) concentrated under reduced pressure

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

Procedure: A mixture of methyl 3-carbamimidoyl-4-methylbenzoate (compound 1.9, 400 mg, 1.98 mmol, 1.00 equiv, 95%), 3-bromodihydro-2H-pyran-4(3H)-one (compound 1.10.1, 750 mg, 2.09 mmol, 1.00 equiv), and potassium carbonate (580 mg, 4.20 mmol, 2.00 equiv) in CH3CN (15 mL) was stirred overnight at 80° C. under nitrogen. After cooling to ambient temperature, the reaction mixture was concentrated under reduced pressure. The residue was dissolved in 50 mL of ethyl acetate and washed with 2×10 mL of H2O. The organic phase was dried over (Na2SO4) and concentrated under reduced pressure. The residue was purified using silica gel column chromatography and purified using ethyl acetate/petroleum ether (1/3) to yield 0.21 g (37%) of the title compound as a white solid. After cooling to ambient temperature the reaction mixture was concentrated under reduced pressure The residue was dissolved in 50 mL of ethyl acetate washed with 2×10 mL of H2O The organic phase was dried over (Na2SO4) concentrated under reduced pressure The residue was purified purified