反应详情

To a solution of 2-tert-butyl-4-fluoro-5-nitro-1H-indole (2.1 g, 9.0 mmol) in methanol (50 mL) was added NiCl2 (4.2 g, 18 mmol) and NaBH4 (1.0 g, 27 mmol) at 0° C. After the addition, the mixture was stirred for 5 min. Water (20 mL) was added and the mixture was extracted with EtOAc (30 mL×3). The organic layers were washed with sat. NaCl and water, dried over anhydrous Na2SO4, evaporated under vacuum to give 2-tert-butyl-4-fluoro-1H-indol-5-amine (900 mg, 50%). 1H NMR (300 MHz, CDCl3) δ 7.80 (brs, 1H), 6.91 (d, J=8.4 Hz, 1H), 6.64 (dd, J=0.9, 2.4 Hz, 1H), 6.23 (s, 1H), 1.38 (s, 9H).

1. additionAfter the addition
2. extractionthe mixture was extracted with EtOAc (30 mL×3)
3. washThe organic layers were washed with sat. NaCl and water
4. dry with materialdried over anhydrous Na2SO4
5. customevaporated under vacuum