反应详情

To a mixture of tert-butyl (1-amino-3-ethoxypropan-2-yl)carbamate (0.45 g, 2.6 mol) and sodium carbonate (0.29 g, 3.2 mol) in THF (5 mL) and water (3 mL) was added dropwise benzyl chloroformate (0.58 g, 3.4 mol) at 0° C. and then the reaction mixture was allowed to warm to ambient temperature. After 3 hours, the reaction mixture was concentrated under reduced pressure and the resulting residue was purified via reverse phase HPLC (acetonitrile/water with 0.1% TFA, linear gradient) to give benzyl tert-butyl (3-ethoxypropane-1,2-diyl)biscarbamate. MS ESI calc'd. for C18H29N2O5 [M+H]+ 353. found 353. 1H NMR (400 MHz, CD3OD) δ 7.36-7.35 (m, 5H), 5.09 (s, 2H), 3.52-3.49 (m, 1H), 3.42-3.32 (m, 6H), 1.45 (s, 9H), 1.19 (t, J=7.0 Hz, 3H).

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. customthe resulting residue was purified via reverse phase HPLC (acetonitrile/water with 0.1% TFA, linear gradient)