反应详情

To a solution of 5-(benzoxazol-2-yl)-2-methyl-1-tert-butoxycarbonylmethylbenzimidazole (see Working Example 91-2) (100 mg, 0.275 mmol) in chloroform (3 mL) was added aqueous sodium hydroxide solution (1 M, 0.55 mL, 0.55 mmol). This two-layer solution was homogenized by the addition of methanol, and this was stirred at room temperature for 2 hours. After the reaction was complete, the solution was concentrated, aqueous acetic acid solution was added, and this was stirred at room temperature. The precipitated crystals were filtered, and after washing with water were dried to yield the title compound (76.9 mg, 91% yield) as light yellow crystals.

1. concentrationthe solution was concentrated
2. additionaqueous acetic acid solution was added
3. stirringthis was stirred at room temperature
4. filtrationThe precipitated crystals were filtered
5. washafter washing with water
6. customwere dried