N,O-Dimethylhydroxylamine → 1,1-Dimethylethyl N-((1S)-2-(methoxymethylamino)-2-oxo-1-(phenylmethyl)ethyl)carbamate

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To a solution of Boc-Phe-OH 5.1 (2.0 g, 7.53 mmol) and N,O dimethylhydroxylamine (808 mg, 8.29 mmol) in DCM (38 ml) was added TEA (2.2 ml, 15.8 mmol) and HOBT (1.27 g, 8.29 mmol). After cooling to 0° C., EDCI (1.59 g, 8.29 mmol) was added in one portion, and the reaction was stirred overnight, warming to room temperature. The reaction was concentrated in vacuo, diluted with EthOAc (150 ml), and washed with H2O, 1 N KHSO4, 1 N NaHCO3 and brine. After drying over Na2SO4, filtering, and concentrating in vacuo, the residue was purified by flash chromatography to give the title compound as an oil in 88% yield. Rf=0.35 (50% EthOAc/hexane). 1H NMR (300 MHz, CDCl3) δ7.28 (d, 2H, J=7.4 Hz), 7.24 (t, 1H, J=6.8 Hz), 7.17 (d, 2H, 7.1 Hz), 5.18 (d, 1H, J=7.4 Hz), 4.9 (dd, 1H, J=7.0, 11.9 Hz), 3.66 (s, 3H), 3.16 (s, 3H), 3.05 (dd, 1H, J=6.0, 13.6 Hz), 2.87 (dd, 1H, J=7.0, 13.6 Hz), 1.39 (s, 9H).

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