反应详情

温度

90 °C

The product of Example 457B (2.24 g, 12.37 mmol) in pyridine (8.0 mL, 98.96 mmol) and dioxane (50 mL) at 90° C. was treated with excess tris(methylthio)methyl methyl sulfate (prepared using the procedures in Synthesis, 22-25, 1988; M. Barbero, S. Cadamuro, I. Degani, R. Fochi, A. Gatti, V. Regondi), stirred at 90° C. for 1.5 hours and cooled to about 25° C. The reaction solution was decanted from the resulting solids and the solvent was removed under reduced pressure. The residue was dissolved in hexanes and loaded onto a pad of silica gel (300 mL) and eluted with hexane followed by dichloromethane then 25% ethyl acetate in dichloromethane to provide the title compound (2.42 g, 75%).

1. customprepared
2. customin Synthesis, 22-25, 1988
3. temperaturecooled to about 25° C
4. customThe reaction solution was decanted from the resulting solids
5. customthe solvent was removed under reduced pressure
6. dissolutionThe residue was dissolved in hexanes
7. washeluted with hexane