反应详情

Add 85% manganese(IV) oxide (500 g, 5.75 mol) to a slurry of (2-bromopyridine)-(2-chlorophenyl)-methanol (392 g, 1.131 mol) in toluene (2.5 L), heat to a reflux and stir. After one hour cool to ambient temperature and filter through Celite®. Concentrate the solution under reduced pressure. Purify by recrystalization from MTBE: heptane (2:1) to give title compound 312.4 g (80%). 1H NMR (300 MHz, CDCl3), δ 8.50 (dd, 1H, J=1.83, 4.73), 7.78 (dd, 1H, J=1.83, 7.63), 7.60 (dd, 1H, J=1.53, 7.63), 7.53-7.34 (m, 4H); MS (IS) m/z 296.0 (M+1), 298.0 (M+1); m.p.=76.3° C.; Analysis for C12H7BrClNO: calcd: C, 48.60; H, 2.38; N, 4.72; found: C, 48.71; H, 2.48; N, 4.61; Rf=0.40 (hexane:ethyl acetate 2:1).

1. temperatureheat to
2. temperaturea reflux
3. filtrationfilter through Celite®
4. concentrationConcentrate the solution under reduced pressure
5. customPurify by recrystalization from MTBE: heptane (2:1)