Trifluoroacetic anhydride → 2-Methoxy-3-nitro-5,6,8,9-tetrahydrobenzocyclohepten-7-one

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Reaction Steps

2-Methoxy-5,6,8,9-tetrahydro-benzocyclohepten-7-one (6.00 g, 0.0315 mol) was dissolved in Acetonitrile (280 mL, 5.4 mol) and was added to a mixture of Trifluoroacetic anhydride (13.4 mL, 0.0946 mol) in Acetonitrile at 0° C. Potassium nitrate (3.19 g, 0.0315 mol) was then added and the reaction was allowed to warm to room temperature. When HPLC showed consumption of starting material, the mixture was poured over saturated sodium bicarbonate, and organics were extracted with ethyl acetate/dichloromethane. Combined organics were dried over sodium sulfate, filtered and reduced en vacuo. The crude mixture was purified by Isco flash column chromatography (Hexane/Ethyl Acetate). The gradient run was 0% EA-50% EA. Combined fractions were reduced en vacuo to afford 3.62 (49%) of 2-Methoxy-3-nitro-5,6,8,9-tetrahydro-benzocyclohepten-7-one and 1.80 grams (25%).

Provenance & Evidence