Di-tert-butyl dicarbonate → Tert-butyl{(1s,2s)-2-[3,5-bis(trifluoromethyl)phenyl]-2-hydroxy-1-methylethyl}{[5'-isopropyl-2'-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}carbamate

Participants

Reaction Steps

To a solution of (1S,2S)-1-[3,5-bis(trifluoromethyl)phenyl]-2-({[5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}amino)propan-1-ol (135.5 mg, 0.228 mmol) in CH2Cl2 (5 mL) was added BOC2O (49.7 mg, 0.228 mmol). The reaction was stirred at room temperature for 2 days; during this time, 2 additional portions of BOC2O (25 mg each) were added. After 2 days, the reaction was concentrated, and the residue was purified by flash chromatography with 20% EtOAc/hexanes to afford tert-butyl{(1S,2S)-2-[3,5-bis(trifluoromethyl)phenyl]-2-hydroxy-1-methylethyl}{[5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}carbamate. Rf=0.41 (40% EtOAc/hexanes). LCMS=594.2 (M+1−BOC)+.

Provenance & Evidence