Reaction Steps
The amine from above (220 mg) was dissolved in pyridine (5 mL) and 9-Fluorenylmethoxycarbonyl isothiocyanate (180 mg, 0.65 mmol) and triethylamine (0.02 mL) was added. Then the resulting mixture was stirred at room temperature for 16 h. The solution was concentrated and the residue taken up in CH2Cl2 (20 mL) and diluted with saturated aqueous NaHCO3 (20 mL), then the resulting mixture was extracted with CH2Cl2 (3×10 mL) and the combined organic extracts were dried (Na2SO4) and concentrated. Flash chromatography of the residue (EtOAc:hexanes 2:3) gave (2S,3R,4R,5S,6R)-6-(acetoxymethyl)-3-(3-(((9H-fluoren-9-yl)methoxy)carbonyl)thioureido)-tetrahydro-2H-pyran-2,4,5-triyl triacetate as a white foam (360 mg, 89% yield over two steps). 1H NMR (600 MHz, CDCl3) δ 2.06 (s, 3H), 2.07 (s, 3H), 2.12 (s, 3H), 2.14 (s, 3H), 3.89 (ddd, 1H, J=2.4, 4.8, 9.6 Hz), 4.17 (dd, 1H, J=2.4, 12.5 Hz), 4.24 (dd, 1H, J=6.6, 6.6 Hz), 4.33 (dd, 1H, J=4.8, 12.5 Hz), 4.52 (s, 1H), 4.54 (s, 1H), 5.08-5.12 (m, 1H), 5.22 (dd, 1H, J=9.5, 9.6 Hz), 5.34 (dd, 1H, J=6.6, 9.5 Hz), 5.88 (d, 1H, J=6.6 Hz), 7.36 (dd, 2H, J=7.2, 7.8 Hz), 7.45 (dd, 2H, J=7.2, 7.8 Hz), 7.57 (d, 2H, J=7.8 Hz), 7.80 (d, 2H, J=7.2 Hz). 13C NMR (150 MHz, CDCl3) δ 20.62, 20.72, 20.77, 21.05, 46.49, 57.59, 61.65, 67.47, 68.40, 72.21, 72.87, 92.21, 120.09, 120.29, 124.84, 124.96, 125.32, 127.30, 127.83, 128.15, 128.25, 129.06, 141.37, 142.80, 152.16, 169.27, 169.34, 170.46, 170.72, 180.22.
