反应详情

A mixture of 6-bromo-2,3-dimethoxybenzaldehyde (48.4 g, 0.20 mole), NH4OAc (1.93 g, 0.025 mole), cyanoacetic acid (0.186 mole, 15.8 g), pyridine (42 mL), and benzene (193 mL) was stirred at reflux for 2 hours using a Dean-Stark trap for water removal. Upon cooling to room temperature a solid was filtered and washed with hexane. The solid was dissolved in 1N KOH, and was extracted with ether. The aqueous layer was acidified with 10% HCl and was extracted with CH2Cl2. The combined CH2Cl2 layers were washed with water, saturated aqueous NaCl, dried (MgSO4), filtered, and evaporated to yield 41.7 g yellow solid, (67%); mp 130°-2°; M+ 311.

1. temperatureat reflux for 2 hours
2. customfor water removal
3. filtrationwas filtered
4. washwashed with hexane
5. dissolutionThe solid was dissolved in 1N KOH
6. extractionwas extracted with ether
7. extractionwas extracted with CH2Cl2
8. washThe combined CH2Cl2 layers were washed with water, saturated aqueous NaCl
9. dry with materialdried (MgSO4)
10. filtrationfiltered
11. customevaporated