反应条件
1: 1) NaNO2, CH3COOH, 2) Zn, CH3COOH / 1) H2O, < 5 deg C, 1 h, then rt, 1 h, 2) reflux, 2 h
2: 42 percent / bromine / acetic acid / 0.5 h / 40 - 43 °C
3: 50 percent / aq. HBr / methanol / 7 h / Heating
View Scheme
参考文献
Byun; Lightner
Journal of Heterocyclic Chemistry, 1991 , vol. 28, # 7 p. 1683 - 1692