反应详情

To a solution of 0.30 g ethyl [3-(2,2-dimethylpropanoyl)-6-methoxy-1H-indazol-1-yl]acetate from the Step D above in 20 mL MeOH and 2 mL water was added 0.50 mL of 5 N NaOH solution. After the solution was stirred at room temperature for 16 hours, the solvents were removed under reduced pressure. The residue was partitioned between cold water and EtOAc with 3 mL 1 N HCl. Separate the layers. Extract the aqueous layer with EtOAc (4×). The combined EtOAc extract was washed with saturated brine (2×), dried over anhydrous Na2SO4, and evaporated to give the title compound as yellowish solid. 1H NMR (CDCl3, 500 MHz) δ 8.27 (d, J=8.9 Hz, 1H), 7.00 (dd, =2.1 & 8.9 Hz, 1H), 6.68 (d, =2.1 Hz, 1H), 5.21 (s, 2H), 3.90 (s, 3H), 1.50 (s, 9H). LC-MS: 3.40 min. (m/Z=245.1, 291.1).

1. customthe solvents were removed under reduced pressure
2. customThe residue was partitioned between cold water and EtOAc with 3 mL 1 N HCl
3. customSeparate the layers
4. extractionExtract the aqueous layer with EtOAc (4×)
5. extractionThe combined EtOAc extract
6. washwas washed with saturated brine (2×)
7. dry with materialdried over anhydrous Na2SO4
8. customevaporated