反应详情

The compound obtained in Example 53-3 (19.0 mg) was dissolved in methanol (0.19 ml) and 4 mol/l hydrochloric acid/dioxane (0.19 ml) was added. After 2.5 hours, the reaction solution was concentrated and azeotropically distilled with methanol. The residue was purified by silica gel column chromatography (1 g, chloroform/methanol/water=7/3/0.5). The obtained title compound was dissolved in methanol. Activated carbon (4 mg) was added to the solution, followed by filtration and concentration. After the addition of 1 mol/l hydrochloric acid and a small amount of methanol, the residue was concentrated and dried under reduced pressure to obtain hydrochloride of the title compound (17.9 mg) as a yellow solid.

1. concentrationthe reaction solution was concentrated
2. distillationazeotropically distilled with methanol
3. customThe residue was purified by silica gel column chromatography (1 g, chloroform/methanol/water=7/3/0.5)