反应详情

Dissolve 1.68 g ethyl (3-isobutyryl-6-methoxy-1H-indazol-1-yl)acetate in 50 mL MeOH at 45° C. Add 10 mL water and 1.5 mL 5 N NaOH solution. The resulting mixture was heated overnight and evaporated to dry. The residue was taken up in water, acidified with 0.8 mL concentrated HCl, and extracted with 3×50 mL EtOAc. The combined organic extract was washed with water and saturated brine, dried over anhydrous Na2SO4, and evaporated to give the title compound as a white solid. 1H NMR (CDCl3, 500 MHz) δ 8.27 (d, 8.9 Hz, 1H), 7.01 (dd, 2.1 & 8.9 Hz, 1H), 6.69 (d, 2.1 Hz, 1H), 5.23 (s, 2H), 3.91 (s, 3H), 3.85 (heptet, 6.9 Hz, 1H), 1.28 (d, 7.1 Hz, 6H). In NOE difference spectrum, irradiation of the 5.23 ppm singlet showed positive NOE at the 6.69 ppm doublet. LC-MS: 2.94 min. (m/Z=277.0, 299.0).

1. temperatureThe resulting mixture was heated overnight
2. customevaporated
3. customto dry
4. extractionextracted with 3×50 mL EtOAc
5. extractionThe combined organic extract
6. washwas washed with water and saturated brine
7. dry with materialdried over anhydrous Na2SO4
8. customevaporated