3,5-Difluoro-L-phenylalanine, N-BOC protected → (S)-2-Boc-amino-3-(3,5-difluorophenyl)propan-1-OL

Participants

Reaction Steps

To a solution of (2S)-2-[(tert-butoxycarbonyl)amino]-3-(3,5-difluorophenyl)propanoic acid [Aldrich] (3.00 g, 9.96 mmol) in tetrahydrofuran (30 mL) at 0° C. was added 1.0 M borane-THF complex in tetrahydrofuran (32 mL, 32 mmol). The reaction mixture was stirred at room temperature for 3 hrs, and then cooled with an ice bath, quenched with AcOH:MeOH (1:5, 10 mL), and partitioned between saturated aqueous NaHCO3 solution and dichloromethane (DCM). The aqueous phase was then extracted several times with DCM. The combined organic fractions were dried over Na2SO4 and concentrated under reduced pressure. The residue was used directly for the next reaction. LCMS (ES) m/e 288.1 (M+H)+.

Provenance & Evidence