Sodium triacetoxyborohydride → (S)-(1-{[4,4-Bis-(4-fluoro-phenyl)-butylamino]-methyl}-3-methyl-butyl)-methyl-carbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

4,4-bis-(4-fluorophenyl)-butylamine (200 mg, 0.77 mmol) was dissolved in CH,2Cl2 (5 mL), treated with (S)-(1-formyl-3-methyl-butyl)-methyl-carbamic acid tert-butyl ester (229 mg, 1.0 mmol), stirred for 30 minutes, then cooled to 0° C., treated with NaBH(OAc)3 (245 mg, 1.16 mmol), and stirred overnight at room temperature. The reaction was diluted with EtOAc (100 mL), washed with saturated bicarbonate solution and brine, dried over Na2SO4, and concentrated. The crude material was chromatographed on silica gel eluting with 4% MeOH/CH2Cl2 to give 257 mg (70%) of the desired product as an oil. MS: 475.4 (M+1 for C28H40N2O2F2); an oil; TLC (SiO2), Rf 0.26 (4% MeOH/CH2Cl2); HPLC (1:1 CH3CN/H2O with 0.1% TFA, C-18 column) 100%, RT=15.013 min.

Provenance & Evidence