反应详情

温度

50 °C

Concentrated HCl (2.5 mL) was added to a solution of 5-nitro-1-(1,3-oxazol-2-ylmethyl)-1H-indazole (456 mg, 1.87 mmol) and SnCl2 (1.42 g, 7.47 mmol) in ethanol (10 mL) and the mixture was heated at 50° C. for 4 hours. The mixture was cooled down, neutralized to pH 8 with 2N sodium hydroxide and extracted with ethyl acetate. The residue is purified on silica gel (EtOAc) to give 1-(1,3-oxazol-2-ylmethyl)-1H-indazol-5-amine (182 mg, 46%); NMR spectrum (CDCl3) 5.55 (s, 2H), 6.79 (d, 1H), 6.86 (s, 1H), 7.00 (s, 1H), 7.24 (d, 1H), 7.50 (s, 1H), 7.77 (s, 1H); Mass spectrum MH+ 215.

1. temperatureThe mixture was cooled down
2. extractionextracted with ethyl acetate
3. customThe residue is purified on silica gel (EtOAc)