反应详情

A solution of 3-trifluoromethylbenzoyl chloride (17 μl, 0.11 mmol), N,N-diisopropylethylamine (21 μl, 0.12 mmol) and 3-(4-bromo-2-methyl-2H-pyrazol-3-yl)-4-(2-methyl-2-nitropropoxy)aniline (37 mg, 0.10 mmol) in 0.5 mL of dichloromethane was stirred at room temperature. After 1 h the solution was diluted with dichloromethane, washed with 1M hydrochloric acid and saturated sodium bicarbonate, dried with sodium sulfate, filtered, and evaporated to dryness. The residue was taken up in methanol (0.4 mL), acetic acid (114 μl, 2.0 mmol) was added followed by zinc dust (65 mg, 1.0 mmol) and the mixture was stirred at room temperature. After 1 h the mixture was made strongly basic with conc ammonium hydroxide, and the product was extracted with ethyl acetate. The ethyl acetate layer was washed with brine, dried with sodium sulfate, filtered, and evaporated to dryness. The crude product was purified by preparative LCMS and lyophilized to afford the product (46 mg, 74%) as a TFA-salt. LCMS m/z (%)=513.5 (M+H 81Br 71.7%), 511.3 (M+H 79Br 82.9%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.17 (s, 3H), 1.18 (s, 3H), 3.67 (s, 3H), 3.84 (d, J=9.60 Hz, 1H), 4.00 (d, J=9.85 Hz, 1H), 7.31 (d, J=9.09 Hz, 1H), 7.67 (s, 1H), 7.70 (d, J=2.78 Hz, 1H), 7.80 (t, J=7.71 Hz, 1H), 7.86-7.94 (m, 3H), 7.94-8.01 (m, 2H), 8.26 (d, J=8.08 Hz, 1H), 8.29 (s, 1H), 10.57 (s, 1H).

1. washwashed with 1M hydrochloric acid and saturated sodium bicarbonate
2. dry with materialdried with sodium sulfate
3. filtrationfiltered
4. customevaporated to dryness
5. extractionthe product was extracted with ethyl acetate
6. washThe ethyl acetate layer was washed with brine
7. dry with materialdried with sodium sulfate
8. filtrationfiltered
9. customevaporated to dryness
10. customThe crude product was purified by preparative LCMS