反应详情

To a mixture of methyl 5-cyano-3-methyl-1-benzofuran-2-carboxylate (4.20 g) synthesized above, tetrahydrofuran (80 mL), water (20 mL) and methanol (20 mL) was added lithium hydroxide monohydrate (1.64 g), and the mixture was stirred overnight at room temperature, and concentrated under reduced pressure. 1N Hydrochloric acid was added to the residue, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was washed with diisopropyl ether to give the title object compound (3.58 g, 91%) as a pale-brown solid.

1. concentrationconcentrated under reduced pressure
2. addition1N Hydrochloric acid was added to the residue
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with saturated brine
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. washThe residue was washed with diisopropyl ether