反应详情

Into a 1 l. r.b. flask equipped with a Dean-Stark trap was placed 22 g. (0.055 mole) of 1-(3,4-dimethoxyphenyl)-7-(4-methoxyphenyl)-2-nitro-5-heptanone, 2 g. of p-toluenesulfonic acid, 25 ml. of ethylene glycol, and 500 ml. of benzene, the mixture was refluxed until no more water was separated, and then cooled to room temperature. The dark solution was poured into cold dil. NaHCO3 solution and extracted with ethyl acetate. The organic layer was backwashed with water and dried over anhydrous MgSO4. Upon removing solvent by distillation a gray solid was obtained from trituration with ether. Recrystallization from 80% ethanol yielded 25 g. of product as a white solid; m.p. 98°-100° C.

1. customflask equipped with a Dean-Stark trap
2. customwas separated
3. additionThe dark solution was poured into cold dil. NaHCO3 solution
4. extractionextracted with ethyl acetate
5. dry with materialdried over anhydrous MgSO4
6. customUpon removing solvent
7. distillationby distillation a gray solid
8. customwas obtained from trituration with ether
9. customRecrystallization from 80% ethanol
10. customyielded 25 g