反应详情

To 2.9 g of ethyl 2-[4-(4-chloroanilinomethyl)phenoxy]-2-methylpropionate are added 10 ml of formaldehyde and 20 ml of formic acid to prepare a solution, which is stirred at room temperature for 30 minutes and then at 50° C. for 1 hour. The formaldehyde and formic acid are distilled off from the reaction mixture under reduced pressure, and ethanol is added to the residue. After filtering off the insolubles from the resulting solution, the ethanol is distilled off from the filtrate. The resulting oily residue is dissolved in ether, washed with water and dried. The ether is distilled off from the dried solution to given an oily residue (2.8 g), which is purified by silica gel column chromatography, using chloroform as an eluent to give 2.3 g of ethyl 2-[4-{N-(4-chlorophenyl)-N-methylaminomethyl}phenoxy]-2-methylpropionate, an oily product.

1. customto prepare a solution, which
2. waitat 50° C. for 1 hour
3. distillationThe formaldehyde and formic acid are distilled off from the reaction mixture under reduced pressure, and ethanol
4. additionis added to the residue
5. filtrationAfter filtering off the insolubles from the resulting solution
6. distillationthe ethanol is distilled off from the filtrate
7. dissolutionThe resulting oily residue is dissolved in ether
8. washwashed with water
9. customdried
10. distillationThe ether is distilled off from the dried solution
11. customis purified by silica gel column chromatography