Nitric Acid → [(4aR,6R,8aS)-2-amino-8a-(2-fluoro-5-nitrophenyl)-4,4a,5,6,8,8a-hexahydro-7-oxa-3-thia-1-azanaphthalen-6-yl]methanol

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Reaction Steps

Concentrated sulfuric acid (2.5 ml) was added dropwise to a solution of [(4aR,6R,8aS)-2-amino-8a-(2-fluorophenyl)-4,4a,5,6,8,8a-hexahydro-7-oxa-3-thia-1-azanaphthalen-6-yl]methanol (700 mg) in TFA (5 ml) in an ice bath. Then, fuming nitric acid (specific gravity: 1.52, 103 μl) was added dropwise at the same temperature, followed by stirring for one hour. The reaction mixture was poured into ice and made basic with a 5 N sodium hydroxide solution, followed by stirring at room temperature for two hours. The aqueous layer was extracted with dichloromethane, and the organic layer was dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to obtain the title compound (1.0 g).

Provenance & Evidence