反应详情

Potassium hydroxide (5.2 g, 0.093 mol) was ground to a powder under nitrogen, added to DMSO (30 ml) and stirred for 20 min under nitrogen at room temperature. The mixture was cooled to 0° C. and 3-hydroxy-2-hydroxymethyl pyridine hydrochloride (5.0 g, 0.031 mol) was added. The slurry was stirred at 0° C. for 1 h before the addition of cyclopropylmethyl bromide (3.01 ml, 4.2 g, 0.031 mol). The mixture was allowed to warm to room temperature and stirred under nitrogen overnight. Water (100 ml) was added, and the resultant solution was acidified to pH 1 with hydrochloric acid (5 N). The solution was washed with dichloromethane (3×100 ml), basified to pH 14 with sodium hydroxide solution (4 N), and washed again with dichloromethane (3×100 ml). The organic layers from the second extraction were combined, washed with water (1×100 ml) and saturated sodium chloride solution (1×100 ml), dried over magnesium sulfate and concentrated in vacuo to give 3-cyclopropylmethyloxy-2-hydroxymethyl pyridine as a dark brown solid (2.40 g). 1H NMR (250 MHz, CDCl3) δ 0.35 (2H, m), 0.65 (2H, m), 1.26 (1H, m), 3.85 (2H, d, J=6.8 Hz), 4.33 (1H, br s), 4.77 (2H, s), 7.13 (2H, m), 8.13 (2H, m); MS (ES+) m/e 180 [MH]+.

1. temperatureThe mixture was cooled to 0° C.
2. temperatureto warm to room temperature
3. stirringstirred under nitrogen overnight
4. washThe solution was washed with dichloromethane (3×100 ml)
5. washwashed again with dichloromethane (3×100 ml)
6. extractionThe organic layers from the second extraction
7. washwashed with water (1×100 ml) and saturated sodium chloride solution (1×100 ml)
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated in vacuo