prop-2-enyl 2-(5-bromo-2-fluorophenyl)acetate

Conditions: temp:23.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) (4.2 ml, 28 mmol) in THF (24 ml) at 23° C. was added a solution of (5-bromo-2-fluoro-phenyl)-acetic acid allyl ester (intermediate B3A) (7.29 g, 27 mmol) and commercially available p-acetamidobenzenesulfonyl azide ([CAS No. 2158-14-7], 6.94 g, 28 mmol) in THF (48 ml) over 1 h. The mixture was stirred for 5 h at 23° C. Then it was quenched with sat. aqueous ammonium chloride solution, diluted with ethyl acetate, and the organic layer was washed with brine and dried over sodium sulfate. Removal of the solvent in vacuum left a yellow oil, which was purified by silica gel column chromatography with hexane/ethyl acetate to give the title compound as a yellow solid (7.344 g, 92%). MS (ISP): m/z=316.1 [(M+NH4)+] and 318.0 [(M+2+NH4)+]. Then it was quenched with sat. aqueous ammonium chloride solution diluted with ethyl acetate the organic layer was washed with brine dried over sodium sulfate Removal of the solvent in vacuum left a yellow oil, which was purified by silica gel column chromatography with hexane/ethyl acetate

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

Procedure: To a mixture of allyl alcohol (22.1 g, 380.5 mmol) and triethylamine (Et3N) (5.4 ml, 39 mmol) at 0° C. was added over 1 h crude (5-bromo-2-fluoro-phenyl) -acetyl chloride (intermediate B2A) (7.01 g, ca. 26 mmol). Then the reaction was stirred over 1 h from 0° C. to 23° C. The reaction mixture was diluted with ethyl acetate, washed with water, and the organic layer was dried over sodium sulfate. Removal of the solvent in vacuum left the title compound as a yellow oil (7.290 g, 103%), which was used without further purification. MS (ISP): m/z=280.1 [(M+NH4)+] and 282.1 [(M+2+NH4)+] washed with water the organic layer was dried over sodium sulfate Removal of the solvent in vacuum left the title compound as a yellow oil (7.290 g, 103%), which was used without further purification