反应条件
1: 1) 2.5 M n-butyllithium / 1) THF, -78 deg C, 50 min, 2) -78 deg C, 30 min
2: 92 percent / K2CO3 / 2 h
3: 85 percent / p-toluenesulfonic acid / tetrahydrofuran; H2O / 15 h / Heating
4: trifluoroacetic acid / benzene / 72 h
View Scheme
参考文献
Crimmins, Michael T.; O'Mahony, Rosemary
Journal of Organic Chemistry, 1990 , vol. 55, # 23 p. 5894 - 5900