ethyl (3R)-3-amino-3-(2-bromo-4-fluorophenyl)propanoate

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

Procedure: A 500 mL round-bottom flask charged with 31D (13.3 g, 41 mmol) in 200 mL of DCM and TEA (22.8 mL, 3 equiv.) was added diketene (31E, 8.81 mL, 50% in DCM). The reaction was stirred at ambient temperature until completion (2 h, determined by LCMS). The reaction mixture was washed with 1 N NaHSO4, brine, dried over Na2SO4 and concentrated in vacuo to afford Compound 31F as a yellow solid (15.3 g, 99%). ESI-MS: m/z 374.0 (MH+). The reaction mixture was washed with 1 N NaHSO4, brine dried over Na2SO4 concentrated in vacuo

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

Procedure: A 500 mL round-bottom flask charged with 31D (13.3 g, 41 mmol) in 200 mL of DCM and TEA (22.8 mL, 3 equiv.) was added diketene (31E, 8.81 mL, 50% in DCM). The reaction was stirred at ambient temperature until completion (2 h, determined by LCMS). The reaction mixture was washed with 1 N NaHSO4, brine, dried over Na2SO4 and concentrated in vacuo to afford Compound 31F as a yellow solid (15.3 g, 99%). ESI-MS: m/z 374.0 (MH+). The reaction mixture was washed with 1 N NaHSO4, brine dried over Na2SO4 concentrated in vacuo

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

Procedure: A 500 mL round-bottom flask charged with 31D (13.3 g, 41 mmol) in 200 mL of DCM and TEA (22.8 mL, 3 equiv.) was added diketene (31E, 8.81 mL, 50% in DCM). The reaction was stirred at ambient temperature until completion (2 h, determined by LCMS). The reaction mixture was washed with 1 N NaHSO4, brine, dried over Na2SO4 and concentrated in vacuo to afford Compound 31F as a yellow solid (15.3 g, 99%). ESI-MS: m/z 374.0 (MH+). The reaction mixture was washed with 1 N NaHSO4, brine dried over Na2SO4 concentrated in vacuo