反应详情

To 2-fluoro-5-(thiazol-2-yl)benzonitrile (21.8 g, 106.7 mmol) in anhydrous DMF (200 mL) was added recrystallized N-bromosuccinimide (22.7 g, 128 mmol). The reaction mixture was stirred at room temperature for 23 h under N2. The reaction mixture was basified with 1N NaOH and washed with EA and brine. The combined organic layers were dried over MgSO4, filtered, and concentrated to yield orange oil. The crude product was purified by silica gel flash chromatography (20% EA/Hexanes) to produce 21 mg (70%) of 5-(5-bromothiazol-2-yl)-2-fluorobenzonitrile THZ INT-2 as half-white solid. LCMS-ESI (m/z) calculated for C10H4BrFN2S: 283.1; found 284.9 [M+H]+, tR=3.82 min. 1H NMR (400 MHz, CDCl3) δ 8.15 (dd, J=5.9, 2.3 Hz, 1H), 8.08 (ddd, J=8.8, 4.9, 2.3 Hz, 1H), 7.78 (d, J=4.8 Hz, 1H), 7.31 (t, J=8.6 Hz, 1H).

1. washwashed with EA and brine
2. dry with materialThe combined organic layers were dried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. customto yield orange oil
6. customThe crude product was purified by silica gel flash chromatography (20% EA/Hexanes)