methyl 2-(4-fluorophenyl)-2-oxoacetate

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

Conditions: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethyl oxalate (5.90 g, 50 mmol) was dissolved in THF (50 mL) and ether (50 mL) in a 3-neck round bottom flask fitted with a mechanical stirrer. The solution was stirred vigorously at −65° C. as a 1.0 M THF solution of 4-fluorophenylmagnesium bromide (60 mL, 60 mmol) was added dropwise over 40 min. The mixture was stirred 30 min at −65° C. and allowed to warm to −20° C. over 30 min before being poured into 2N aq. HCl (50 mL) with stirring. The layers were separated and the aq. layer was extracted with ether (3×50 mL). The combined organic layers were washed with saturated aq. brine (2×50 mL), dried (sodium sulfate), decanted, and evaporated. The residue was dissolved in ethyl acetate, dried (sodium sulfate), filtered, and evaporated to give a yellow solid. The crude product was dissolved in warm hexane (25 mL), filtered, and cooled to −20° C. Filtration followed by washing with cold hexane (15 mL) gave 4.95 g of the title compound as light tan crystals. was added dropwise over 40 min to warm to −20° C. over 30 min with stirring The layers were separated the aq. layer was extracted with ether (3×50 mL) The combined organic layers were washed with saturated aq. brine (2×50 mL) dried (sodium sulfate) decanted evaporated The residue was dissolved in ethyl acetate dried (sodium sulfate) filtered evaporated to give a yellow solid filtered cooled to −20° C Filtration by washing with cold hexane (15 mL)

Conditions: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethyl oxalate (5.90 g, 50 mmol) was dissolved in THF (50 mL) and ether (50 mL) in a 3-neck round bottom flask fitted with a mechanical stirrer. The solution was stirred vigorously at −65° C. as a 1.0 M THF solution of 4-fluorophenylmagnesium bromide (60 mL, 60 mmol) was added dropwise over 40 min. The mixture was stirred 30 min at −65° C. and allowed to warm to −20° C. over 30 min before being poured into 2N aq. HCl (50 mL) with stirring. The layers were separated and the aq. layer was extracted with ether (3×50 mL). The combined organic layers were washed with saturated aq. brine (2×50 mL), dried (sodium sulfate), decanted, and evaporated. The residue was dissolved in ethyl acetate, dried (sodium sulfate), filtered, and evaporated to give a yellow solid. The crude product was dissolved in warm hexane (25 mL), filtered, and cooled to −20° C. Filtration followed by washing with cold hexane (15 mL) gave 4.95 g of the title compound as light tan crystals. was added dropwise over 40 min to warm to −20° C. over 30 min with stirring The layers were separated the aq. layer was extracted with ether (3×50 mL) The combined organic layers were washed with saturated aq. brine (2×50 mL) dried (sodium sulfate) decanted evaporated The residue was dissolved in ethyl acetate dried (sodium sulfate) filtered evaporated to give a yellow solid filtered cooled to −20° C Filtration by washing with cold hexane (15 mL)

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of methyl (4-fluorophenyl)(oxo)acetate (1.1 g, 0.0059 mol), thiosemicarbazide (0.54 g, 0.0059 mol) in water (10 mL) was heated at reflux for 15 min. Then methanol (10 mL) was added, followed by potassium hydroxide (0.43 g, 0.0077 mol). The mixture was stirred at 90° C. overnight. After cooling, methyl iodide (4 mL, 0.06 mol) was added. The mixture was stirred at RT for 30 min. The precipitate formed was collected by filtration, washed with ether, and dried under high vacuum to give the desired product (1.2 g, 77%). Analytical LCMS: (M+H)+=238.1. was heated at reflux for 15 min After cooling The mixture was stirred at RT for 30 min The precipitate formed was collected by filtration washed with ether dried under high vacuum

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of methyl (4-fluorophenyl)(oxo)acetate (1.1 g, 0.0059 mol), thiosemicarbazide (0.54 g, 0.0059 mol) in water (10 mL) was heated at reflux for 15 min. Then methanol (10 mL) was added, followed by potassium hydroxide (0.43 g, 0.0077 mol). The mixture was stirred at 90° C. overnight. After cooling, methyl iodide (4 mL, 0.06 mol) was added. The mixture was stirred at RT for 30 min. The precipitate formed was collected by filtration, washed with ether, and dried under high vacuum to give the desired product (1.2 g, 77%). Analytical LCMS: (M+H)+=238.1. was heated at reflux for 15 min After cooling The mixture was stirred at RT for 30 min The precipitate formed was collected by filtration washed with ether dried under high vacuum

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of methyl (4-fluorophenyl)(oxo)acetate (1.1 g, 0.0059 mol), thiosemicarbazide (0.54 g, 0.0059 mol) in water (10 mL) was heated at reflux for 15 min. Then methanol (10 mL) was added, followed by potassium hydroxide (0.43 g, 0.0077 mol). The mixture was stirred at 90° C. overnight. After cooling, methyl iodide (4 mL, 0.06 mol) was added. The mixture was stirred at RT for 30 min. The precipitate formed was collected by filtration, washed with ether, and dried under high vacuum to give the desired product (1.2 g, 77%). Analytical LCMS: (M+H)+=238.1. was heated at reflux for 15 min After cooling The mixture was stirred at RT for 30 min The precipitate formed was collected by filtration washed with ether dried under high vacuum

Conditions: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethyl oxalate (5.90 g, 50 mmol) was dissolved in THF (50 mL) and ether (50 mL) in a 3-neck round bottom flask fitted with a mechanical stirrer. The solution was stirred vigorously at −65° C. as a 1.0 M THF solution of 4-fluorophenylmagnesium bromide (60 mL, 60 mmol) was added dropwise over 40 min. The mixture was stirred 30 min at −65° C. and allowed to warm to −20° C. over 30 min before being poured into 2N aq. HCl (50 mL) with stirring. The layers were separated and the aq. layer was extracted with ether (3×50 mL). The combined organic layers were washed with saturated aq. brine (2×50 mL), dried (sodium sulfate), decanted, and evaporated. The residue was dissolved in ethyl acetate, dried (sodium sulfate), filtered, and evaporated to give a yellow solid. The crude product was dissolved in warm hexane (25 mL), filtered, and cooled to −20° C. Filtration followed by washing with cold hexane (15 mL) gave 4.95 g of the title compound as light tan crystals. was added dropwise over 40 min to warm to −20° C. over 30 min with stirring The layers were separated the aq. layer was extracted with ether (3×50 mL) The combined organic layers were washed with saturated aq. brine (2×50 mL) dried (sodium sulfate) decanted evaporated The residue was dissolved in ethyl acetate dried (sodium sulfate) filtered evaporated to give a yellow solid filtered cooled to −20° C Filtration by washing with cold hexane (15 mL)

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

Conditions: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dimethyl oxalate (5.90 g, 50 mmol) was dissolved in THF (50 mL) and ether (50 mL) in a 3-neck round bottom flask fitted with a mechanical stiffer. The solution was stirred vigorously at −65° C. as a 1.0 M THF solution of 4-fluorophenylmagnesium bromide (60 mL, 60 mmol) was added dropwise over 40 min. The mixture was stirred 30 min at −65° C. and allowed to warm to −20° C. over 30 min before being poured into 2N aq. HCl (50 mL) with stirring. The layers were separated and the aq. layer was extracted with ether (3×50 mL). The combined organic layers were washed with saturated aq. brine (2×50 mL), dried (sodium sulfate), decanted, and evaporated. The residue was dissolved in ethyl acetate, dried (sodium sulfate), filtered, and evaporated to give a yellow solid. The crude product was dissolved in warm hexane (25 mL), filtered, and cooled to −20° C. Filtration followed by washing with cold hexane (15 mL) gave 4.95 g of the title compound as light tan crystals. was added dropwise over 40 min to warm to −20° C. over 30 min with stirring The layers were separated the aq. layer was extracted with ether (3×50 mL) The combined organic layers were washed with saturated aq. brine (2×50 mL) dried (sodium sulfate) decanted evaporated The residue was dissolved in ethyl acetate dried (sodium sulfate) filtered evaporated to give a yellow solid filtered cooled to −20° C Filtration by washing with cold hexane (15 mL)

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of methyl (4-fluorophenyl)(oxo)acetate (1.1 g, 0.0059 mol), thiosemicarbazide (0.54 g, 0.0059 mol) in water (10 mL) was heated at reflux for 15 min. Then methanol (10 mL) was added, followed by potassium hydroxide (0.43 g, 0.0077 mol). The mixture was stirred at 90° C. overnight. After cooling, methyl iodide (4 mL, 0.06 mol) was added. The mixture was stirred at RT for 30 min. The precipitate formed was collected by filtration, washed with ether, and dried under high vacuum to give the desired product (1.2 g, 77%). Analytical LCMS: (M+H)+=238.1. was heated at reflux for 15 min After cooling The mixture was stirred at RT for 30 min The precipitate formed was collected by filtration washed with ether dried under high vacuum

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

Procedure: To a solution of 4-fluorophenyl glyoxylic acid (100 mg, 0.595 mmol) in ethyl ether (5 ml) was added trimethylsilyl diazomethane (2 M/hexane, 1 ml) at 0° C. TLC showed reaction was complete after 1 h. The ether was evaporated to leave a yellow oil. Chromatography with hexane/ether (95:5) gave methyl 4-fluorophenylglyoxalate as a pale yellow oil (75 mg). 500 MHz 13C NMR (CDCl3): δ 184.11; 167.85; 165.79; 163.59; 133.04; 132.96; 128.97; 116.33; 116.16; 115.90; 115.72; 52.85. reaction The ether was evaporated to leave a yellow oil

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

Procedure: To a solution of 4-fluorophenyl glyoxylic acid (100 mg, 0.595 mmol) in ethyl ether (5 ml) was added trimethylsilyl diazomethane (2 M/hexane, 1 ml) at 0° C. TLC showed reaction was complete after 1 h. The ether was evaporated to leave a yellow oil. Chromatography with hexane/ether (95:5) gave methyl 4-fluorophenylglyoxalate as a pale yellow oil (75 mg). 500 MHz 13C NMR (CDCl3): δ 184.11; 167.85; 165.79; 163.59; 133.04; 132.96; 128.97; 116.33; 116.16; 115.90; 115.72; 52.85. reaction The ether was evaporated to leave a yellow oil