反应详情

温度

170 °C

A finely powdered mixture of 24 (3.7 g, 16 mmol), 1,2,3,5-tetra-O-acetyl-D-ribofuranose (5.3 g, 16 mmol) and bis(p-nitrophenyl)phosphate (20 mg) was heated at 170° C. for 10 min under reduced pressure. After cooling to room temperature the brown solid mass was dissolved in EtOAc (500 mL) and washed with saturated aqueous sodium bicarbonate (3×300 mL). The dried (Na2SO4) organic layer was evaporated to yield a syrup which was purified by silica gel column chromatography (4×40 cm) using toluene-EtOAc (5:1). The resulting syrup was crystallized from ethanol to give a colorless powder: yield 6.4 g, 80%: mp 125°-126° C.: 1H NMR (DMSO-d6) δ1.99, 2.06, 2.08 (3s, 9H, acetyl), 6.07 (d, J=3.40 Hz, 1H, C1,H), and other sugar protons. Anal. Calcd. for C16H15Cl2N3O8S: C, 40.01: H, 3.15: Cl, 14.76: N, 8.75: S, 6.68. Found: C, 40.20: H, 3.31: Cl, 14.79: N, 8.61: S, 6.66.

1. temperatureAfter cooling to room temperature the brown solid mass
2. washwashed with saturated aqueous sodium bicarbonate (3×300 mL)
3. dry with materialThe dried (Na2SO4) organic layer
4. customwas evaporated
5. customto yield a syrup which
6. customwas purified by silica gel column chromatography (4×40 cm)
7. customThe resulting syrup was crystallized from ethanol
8. customto give a colorless powder