反应详情

To a solution of 4-fluoro-2-(1-methylcyclohexyl)phenyl methyl carbonate (21.5 g, 81 mmol) in 10 mL of concentrated sulfuric acid was added drop-wise to ice cold mixture of concentrated sulfuric acid (120 mL) and KNO3 (8.2 g, 81 mmol) at 0° C. After addition, the reaction mixture was stirred for 15 min while warming to ambient temperature, poured onto crushed ice, extracted with ethyl acetate (120 mL×3). The organic layer was washed with brine, dried over MgSO4, and evaporated under vacuum. The residue was purified by chromatography on silica gel (hexane:ethyl acetate=100:1) to give 4-fluoro-2-(1-methylcyclohexyl)-5-nitrophenyl methyl carbonate as a yellow oil (40.8 g, 81% yield). 1H NMR (400 MHz, CDCl3) δ 7.90 (d, J=6.8 Hz, 1H), 7.34 (d, J=13.2 Hz, 1H), 3.97 (s, 1H), 2.02-1.96 (m, 2H), 1.73-1.45 (m, 8H), 1.39 (s, 3H).

1. additionAfter addition
2. additionpoured
3. customonto crushed ice
4. extractionextracted with ethyl acetate (120 mL×3)
5. washThe organic layer was washed with brine
6. dry with materialdried over MgSO4
7. customevaporated under vacuum
8. customThe residue was purified by chromatography on silica gel (hexane:ethyl acetate=100:1)