1: tetrahydrofuran / 17 h
2: p-toluenesulphonic acid / toluene / 1 h / Heating
View Scheme
参考文献
Greifenstein, Linda G.; Lambert, Joseph B.; Nienhuis, Ronald J.; Fried, Herbert E.; Pagani, Giorgio A.
Journal of Organic Chemistry, 1981 , vol. 46, p. 5125 - 5132