反应详情

To a vigorously stirred solution of (3-isopropyl-pyridin-2-yl)-methanol (26 g, 170 mmol) in CH2Cl2 (575 mL) was added manganese(IV) oxide (105 g, 1.20 mol) under N2. The mixture was stirred for 18 h then filtered through a celite pad and concentrated in vacuo. Purification by column chromatography on silica gel (EtOAc/hexanes, 1:3) afforded 3-isopropyl-pyridine-2-carbaldehyde (15.65 g, 61%) as an orange oil. 1H NMR (CDCl3) δ 1.26 (d, 6H, J=7.0 Hz), 4.17 (sep, 1H, J=6.6 Hz) 7.45 (dd, 1H, J=7.9, 4.4 Hz), 7.84 (d, 1H, J=7.9 Hz), 8.56 (dd, 1H, J=4.4, 1.3 Hz), 10.2 (s, 1H).

1. filtrationthen filtered through a celite pad
2. concentrationconcentrated in vacuo
3. customPurification by column chromatography on silica gel (EtOAc/hexanes, 1:3)