反应详情

To a stirred solution of (R)-N-[(3S,6R)-6-(tert-butyl-dimethyl-silanyloxy)-2-oxo-1-pyridin-3-ylmethyl-azepan-3-yl]-2-[(4R,5R,6R)-6-((E)-3,3-dimethyl-but-1-enyl)-5-hydroxy-2,2-dimethyl-[1,3]dioxan-4-yl]-2-methoxy-acetamide (1.2 g, 1.9 mmol) at room temperature is added tetrabutylammonium fluoride (5.68 mL, 1 M THF, 5.68 mmol). After 2 h, the solution is evaporated and chromatographed on silica (95% CH2Cl2/5% CH3OH) to give 0.74 g (75.2%) of (R)-2-[(4R,5R,6R)-6-((E)-3,3-dimethyl-but-1-enyl)-5-hydroxy-2,2-dimethyl-[1,3]dioxan-4-yl]-N-((3S,6R)-6-hydroxy-2-oxo-1-pyridin-3-ylmethyl-azepan-3-yl)-2-methoxy-acetamide as a white solid. 1H NMR 300 MHz δ 8.52(m, 2H), 7.69 (m, 1H), 7.29 (m, 1H), 5.77 (d, 1H), 5.54(dd, 1H), 4.69 (m, 2H), 4.29 (m, 2H), 4.10 (m, 2H), 3.92 (d, 1H), 3.54 (m, 2H), 3.50 (s, 3H), 3.33 (m,2H), 2.15 (m, 1H), 2.00 (m, 1H), 1.90 (m, 1H), 1.67 (m, 3H), 1.46 (m, 4H), 1.04 (s, 9H), 1.00 (t, 2H); MS (ESI) 520.2 (M+H)+.

1. customthe solution is evaporated
2. customchromatographed on silica (95% CH2Cl2/5% CH3OH)