methyl 2-(2-chloro-4-fluorophenyl)acetate

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

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

Procedure: To a chilled (−78° C.) solution of lithium hexamethydisilylazide (27.1 mL, 1 M in THF, 27.1 mmol) in THF (30 mL) was added methyl 2-(2-chloro-4-fluorophenyl)acetate (5 g, 24.7 mmol) in THF (10 mL). After stirring for 0.5 hour, allyl bromide (2.4 mL, 27.1 mmol) was added in a single portion, the cooling bath removed and the reaction allowed to warm to room temperature (0.5 hour). The reaction was diluted with ethyl acetate, washed with water, brine, and the organic phase was dried with sodium sulfate and the solvent was evaporated in vacuo. The residue was purified by column chromatography on silica gel using n-heptane/ethyl acetate (v/v 1:0 to 9:1) as eluent. The title compound was obtained as a colourless liquid (6.0 g, 100%). the cooling bath removed The reaction was diluted with ethyl acetate washed with water, brine the organic phase was dried with sodium sulfate the solvent was evaporated in vacuo The residue was purified by column chromatography on silica gel

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

Procedure: Methyl 2-chloro-4-fluorophenylacetate (3.15 g, 15.6 mmol), N-bromosuccinimide (2.77 g, 15.6 mmol) and AIBN (255 mg, 1.56 mmol) were suspended in benzene (50.0 mL) and degassed via N2 stream. The resulting mixture was heated to 80° C. for 12 h. After cooling to rt, the mixture was partially concentrated in vacuo and partitioned between ether and water. The layers were separated, and the organic layer was washed with water and brine. The organics were dried (MgSO4), filtered and concentrated in vacuo. The resulting crude oil was purified by by flash chromatography on silica gel (gradient elution; 0%-20% EtOAc/hexanes as eluent) to afford the title compound i-1a. 1HNMR (500 MHz, CDCl3): δ 7.82 (dd, 1H, J=6.0, 8.8 Hz), 7.17 (dd, 1H, J=2.6, 8.3 Hz), 7.08 (m, 1H), 5.88 (s, 1H), 3.84 (s, 3H). degassed via N2 stream After cooling to rt the mixture was partially concentrated in vacuo partitioned between ether and water The layers were separated the organic layer was washed with water and brine The organics were dried (MgSO4) filtered concentrated in vacuo The resulting crude oil was purified by by flash chromatography on silica gel (gradient elution; 0%-20% EtOAc/hexanes as eluent)

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

Procedure: Methyl 2-chloro-4-fluorophenylacetate (3.15 g, 15.6 mmol), N-bromosuccinimide (2.77 g, 15.6 mmol) and AIBN (255 mg, 1.56 mmol) were suspended in benzene (50.0 mL) and degassed via N2 stream. The resulting mixture was heated to 80° C. for 12 h. After cooling to rt, the mixture was partially concentrated in vacuo and partitioned between ether and water. The layers were separated, and the organic layer was washed with water and brine. The organics were dried (MgSO4), filtered and concentrated in vacuo. The resulting crude oil was purified by flash chromatography on silica gel (gradient elution; 0%-20% EtOAc/hexanes as eluent) to afford the title compound i-1a. 1HNMR (500 MHz, CDCl3): δ 7.82 (dd, 1H, J=6.0, 8.8 Hz), 7.17 (dd, 1H, J=2.6, 8.3 Hz), 7.08 (m, 1H), 5.88 (s, 1H), 3.84 (s, 3H). degassed via N2 stream After cooling to rt the mixture was partially concentrated in vacuo partitioned between ether and water The layers were separated the organic layer was washed with water and brine The organics were dried (MgSO4) filtered concentrated in vacuo The resulting crude oil was purified by flash chromatography on silica gel (gradient elution; 0%-20% EtOAc/hexanes as eluent)

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

Procedure: To a chilled (−78° C.) solution of lithium hexamethydisilylazide (27.1 mL, 1 M in THF, 27.1 mmol) in THF (30 mL) was added methyl 2-(2-chloro-4-fluorophenyl)acetate (5 g, 24.7 mmol) in THF (10 mL). After stirring for 0.5 hour, allyl bromide (2.4 mL, 27.1 mmol) was added in a single portion, the cooling bath removed and the reaction allowed to warm to room temperature (0.5 hour). The reaction was diluted with ethyl acetate, washed with water, brine, and the organic phase was dried with sodium sulfate and the solvent was evaporated in vacuo. The residue was purified by column chromatography on silica gel using n-heptane/ethyl acetate (v/v 1:0 to 9:1) as eluent. The title compound was obtained as a colourless liquid (6.0 g, 100%). the cooling bath removed The reaction was diluted with ethyl acetate washed with water, brine the organic phase was dried with sodium sulfate the solvent was evaporated in vacuo The residue was purified by column chromatography on silica gel