反应详情

To a suspension of -(3aR,5R,6S,7R,7aR)-5-(hydroxymethyl)-2-(methylamino)-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diol (1.50 g, 6.40 mmol) and NaHCO3 (1.01 g, 12.0 mmol) in THF/water (40 mL, 1:3) was added benzyl chloroformate (1.70 g, 10.0 mmol). The mixture was stirred at room temperature for 4 days. The organic solvent was removed under reduced pressure to result in a precipitate. The precipitated solid was collected by filtration, washed with Et2O and dried under vacuum, affording benzyl (-(3aR,5R,6S,7R,7aR)-6,7-dihydroxy-5-(hydroxymethyl)-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazol-2-yl)(methyl)carbamate as a white solid (1.72 g, 73%). 1H NMR (400 MHz, CD3OD) δ 7.44-7.32 (m, 5H), 6.13 (d, J=6.9 Hz, 1H), 5.27-5.20 (m, 2H), 4.14 (t, J=6.1 Hz, 1H), 4.02 (t, J=4.9 Hz, 1H), 3.74 (dd, J=2.4, 12.0 Hz, 1H), 3.63 (dd, J=6.1, 12.0 Hz, 1H), 3.53 (dd, J=4.5, 9.2 Hz, 1H), 3.47-3.43 (m, 1H), 3.39 (s, 3H).

1. customThe organic solvent was removed under reduced pressure
2. customto result in a precipitate
3. filtrationThe precipitated solid was collected by filtration
4. washwashed with Et2O
5. customdried under vacuum