反应详情

A solution of methyl 3-nitro-4-chlorobenzoate (0.70 g) in ethyl acetate (2 mL) was added to a solution of 1,8-diazabicyclo[5.4.0]undec-7-ene (1.50 mL) and nitroethane (0.70 mL) at 0° C. The mixture was stirred for 5 h and partitioned with ethyl acetate and water. Potassium permanganate (0.57 g) was added to the water layer and resulting solution was stirred for 45 minutes. Toluene (20 mL) was added and mixture was stirred slowly. The toluene layer was separated and washed with saturated sodium chloride, dried over magnesium sulfate and concentrated in vacuo to afford the crude product. Purification on silica gel with hexane/ethyl acetate 7/3 gave the title compound. NMR (300 MHz, CDCl3) δ 8.74 (1H, s,), 8.36 (1H, d, J=8 Hz), 7.50 (1 H, d, J=8 Hz), 4.00 (3H, s), 2.58 (3H, s).

1. custompartitioned with ethyl acetate and water
2. additionPotassium permanganate (0.57 g) was added to the water layer
3. customresulting solution
4. stirringwas stirred for 45 minutes
5. stirringmixture was stirred slowly
6. customThe toluene layer was separated
7. washwashed with saturated sodium chloride
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated in vacuo
10. customto afford the crude product
11. customPurification on silica gel with hexane/ethyl acetate 7/3