3-BROMO-4-NITRO (1H)INDAZOLE synthesis
- Product Name:3-BROMO-4-NITRO (1H)INDAZOLE
- CAS Number:74209-17-9
- Molecular formula:C7H4BrN3O2
- Molecular Weight:242.03
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Yield:74209-17-9 92%
Reaction Conditions:
with bromine;sodium acetate;acetic acid in chloroform at 25; for 5.5 h;
Steps:
D.C
Step C: Preparation of 3-bromo-4-nitro-lH-indazole: To a flask equipped with a mechanical stirrer was added sodium acetate (26.4 g, 0.306 mol), 4-nitro-lH-indazole (50 g, 0.306 mol), 300 mL of acetic acid and 300 mL of chloroform. Bromine (51.4 g, 0.322 mol) in 60 mL of acetic acid was added to the reaction mixture over 3.5 hours, while the temperature was kept under 25 °C. The reaction mixture was stirred for two hours, then concentrated under reduced pressure. Water (500 mL) was added to the resulting solids. The solids were collected by filtration, washed with 500 mL of water, and dried under vacuum to give 68 g (92%) of 3-bromo-4-nitro-lH-indazole.
References:
WO2012/82689,2012,A1 Location in patent:Page/Page column 58
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