反应详情

To CH3ONa (0.45 g, 0.0082 mol) stirring in 20 ml of dry CH3OH at 10° C. was added 3-benzyloxyacetophenone (5.0 g, 0.019 mol) and methyl 3-formylbenzoate (3.12 g, 0.019 mol). A heavy precipitate formed almost immediately, and the mixture was diluted with 20 ml CH3OH, warmed to room temperature and stirred for 18 hours. Glacial acetic acid (3 ml) was added and the mixture poured into 300 ml H2O. Title product was recovered by filtration, air dried and purified by chromatography on silica gel gradiently eluted with 49 to 39:1 toluene:ethyl acetate, 4.97 g of solid; MS 372.2 (M+); 1H-NMR (300 MHz, CDCl3) delta (ppm) 3.95 (s, 3H), 5.14 (s, 2H), 7.2-7.9 (m, 13H), 8.06 (dt, 1H), 8.3 (s, 1H); TLC Rf 0.7 (49:1 CHCl3 :isopropanol).

1. customA heavy precipitate formed almost immediately
2. filtrationTitle product was recovered by filtration, air
3. customdried
4. custompurified by chromatography on silica gel
5. washgradiently eluted with 49 to 39:1 toluene