Benzyl chloroformate → (s)-Tert-butyl 1-(benzyloxycarbonylamino)-3-hydroxypropan-2-yl(methyl)carbamate

Participants

Reaction Steps

To a solution of (S)-tert-butyl 1-azido-3-(benzyloxy)propan-2-yl(methyl)carbamate (1.8 g of crude, 4.90 mmol) in MeOH (20 mL) was added Pd/C (300 mg). The mixture was transferred to an autoclave reactor, charged with 45 psi of hydrogen, and stirred overnight. The solid was filtered off and the filtrate was added CbzCl (0.83 mL, 5.88 mmol) and DIEA (1.22 mL, 7.35 mmol) and stirred for 30 min. LCMS indicated the completion of the reaction. The reaction mixture was concentrated under reduced pressure, dissolved in EtOAc, washed with NaHCO3, brine, dried over Na2SO4, filtered, and concentrated under reduced pressure to give (S)-tert-butyl 1-(benzyloxycarbonylamino)-3-hydroxypropan-2-yl(methyl)carbamate (2.2 g), which was used without purification. LRMS (M+H+-Boc) m/z 239.1.

Provenance & Evidence