反应详情

Concentrated sulfuric acid (0.005 ml, 0.08 mmol) was added to a 2-propanol (0.5 ml) solution of the compound (52 mg, 0.08 mmol) obtained in Example 70 and the resulting mixture was dissolved by heating. After stirring at room temperature for 2 days, the precipitate was collected by filtration to give 20 mg (34%) of the title compound as a solid.

1. dissolutionthe resulting mixture was dissolved
2. temperatureby heating
3. filtrationthe precipitate was collected by filtration