反应详情

A solution of 4-methoxy-2-n-propylpyridine (45.7 g, 0.3 mol) and 4-methoxyphenacylbromide (69.2 g, 0.3 mol) in 400 ml of dry acetone was heated to reflux for eight hours. The mixture was cooled and the precipitate was isolated and dried to afford 103.8 g (90%) of 4-methoxy-1-(4-methoxyphenacyl)-2-n-propylpyridinium bromide. The quaternary salt (103.8 g) was suspended in 480 ml of water and sodium hydrogen carbonate (102.0 g) was added. The mixture was refluxed for two hours. The resulting precipitate was filtered off, washed with water and dried to yield overall 73.2 g (86%) of 1-ethyl-7-methoxy-2-(4-methoxyphenyl)indolizine. M.p. 101-3° C. 1H-NMR (DMSO-d6, 200 MHz) δ: 1.10 (t, 3H), 2.77 (q, 2H), 3.77 (s, 3H), 3.80 (s, 3H), 6.23 (dd, 1H), 6.65 (d, 1H), 7.00 (d, 2H), 7.35 (s, 1H), 7.38 (d, 2H), 8.06 (d, 1H).

1. temperatureto reflux for eight hours
2. temperatureThe mixture was cooled
3. customthe precipitate was isolated
4. customdried