反应详情

To a solution of 6-bromo-1H-indazole-3-carbaldehyde (300 mg, 1.33 mmol) in THF (1 mL) was added acetic acid (0.11 mL, 2 mmol), 2M dimethylamine in THF (1.33 mL, 2.66 mmol) and sodium triacetoxyborohydride (283 mg, 1.33 mmol). The reaction was stirred at RT for 2 hr then allowed to stand at RT for 18 hr. The mixture was concentrated in vacuo, then diluted with EtOAc (50 mL) and washed with 1M aqueous NaHCO3 (10 mL). The organic layer was washed with brine (5 mL), followed by water (5 mL). The organic layer was then dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as a beige solid: 1H NMR (500 MHz, MeOD) δ 2.31 (6H, s), 3.85 (2H, s), 7.27 (1H, dd, J=8.67, 1.58 Hz), 7.68-7.72 (1H, m), 7.77 (1H, d, J=8.67 Hz). LC-MS: m/z=+253.9/255.9 (M+H)+.

1. waitto stand at RT for 18 hr
2. concentrationThe mixture was concentrated in vacuo
3. additiondiluted with EtOAc (50 mL)
4. washwashed with 1M aqueous NaHCO3 (10 mL)
5. washThe organic layer was washed with brine (5 mL)
6. dry with materialThe organic layer was then dried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo