反应详情

A mixture of methyl 2-bromomethyl-3-cyanobenzoate (14.1 g, 55.5 mmol) and homophthalic anhydride (22.5 g, 138.8 mmol) in acetonitrile (150 ml) was stirred at room temperature, and a solution of triethylamine (23.2 ml) in acetonitrile (100 ml) was added dropwise to the mixture over the period of 1 h. After the completion of addition, the resultant suspension was refluxed for 4 hours. The reaction mixture was then cooled down to room temperature and filtered. The filtered solid was washed thoroughly with acetonitrile (100 ml) and ethanol (2×100 ml) and dried under vacuum at 50° C. Compound 17a was obtained in 81% yield (13.1 g). 1H NMR (DMSO-d6): δ 12.21 (s, 1H); 8.20 (m, 2H); 7.83 (d, J=7.5 Hz, 1H); 7.71 (m, 2H); 7.47 (m, 2H); 4.07 (s, 2H); 3.89 (s, 3H).

1. additionAfter the completion of addition
2. temperatureThe reaction mixture was then cooled down to room temperature
3. filtrationfiltered
4. washThe filtered solid was washed thoroughly with acetonitrile (100 ml) and ethanol (2×100 ml)
5. customdried under vacuum at 50° C