反应详情

温度

0 °C

To a solution of (2S,3R,4R,5R,6R)-4,5-bis(benzyloxy)-6-((benzyloxy)methyl)-2-(iodomethyl)tetrahydro-2H-pyran-3-ol (1.0 g, 1.74 mmol, 1.0 equiv) in dry DCM (10 mL) under nitrogen atmosphere, was added 2,6-lutidine (0.41 mL, 3.5 mmol, 2.0 equiv) at room temperature. The resulting mixture was stirred for 5 minutes. The reaction was cooled to 0° C. and TBSOTf (0.6 mL, 2.6 mmol, 1.5 equiv) was added dropwise. The mixture was then slowly allowed to warm to room temperature. After 1 hour, the mixture was diluted with DCM (20 mL) and washed with water (2×20 mL). The organic layer was dried over Na2SO4 and over anhydrous sodium sulfate, filtered, and concentrated in vacuo to give an oil. The oil was then purified by silica gel chromatography, eluting with 5% EtOAc in petroleum ether to give (((2S,3R,4S,5R,6R)-4,5-bis(benzyloxy)-6-((benzyloxy)methyl)-2-(iodomethyl)tetrahydro-2H-pyran-3-yl)oxy)(tert-butyl)dimethylsilane as a colorless oil (1.05 g, 94%). 1H NMR (400 MHz, CDCl3) δ 7.40-7.22 (m, 13H), 7.09-7.04 (m, 2H), 4.90-4.77 (m, 2H), 4.77-4.68 (m, 2H), 4.53 (d, J=12.1 Hz, 1H), 4.47 (d, J=10.7 Hz, 1H), 4.09 (ddd, J=12.2, 5.9, 3.4 Hz, 1H), 3.91 (dd, J=9.2, 5.9 Hz, 1H), 3.81 (dd, J=10.7, 3.2 Hz, 1H), 3.75 (dd, J=10.7, 2.1 Hz, 1H), 3.69 (dd, J=9.9, 8.7 Hz, 1H), 3.63-3.56 (m, 2H), 3.51 (dt, J=9.9, 2.6 Hz, 1H), 3.41 (t, J=11.8 Hz, 1H), 0.91 (s, 9H), 0.09 (s, 3H), 0.07 (s, 3H).

1. temperatureto warm to room temperature
2. waitAfter 1 hour
3. washwashed with water (2×20 mL)
4. dry with materialThe organic layer was dried over Na2SO4 and over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto give an oil
8. customThe oil was then purified by silica gel chromatography
9. washeluting with 5% EtOAc in petroleum ether