反应条件
1: 95 percent / triethylamine, Pd(PPh3)2Cl2, CuI / 0.25 h / Ambient temperature 2: 1.) tert-butyllithium, 2.) 1,2-dibromoethane / 1.) Et2O, pentane, -20 deg C, 3 h, 2.) Et2O, pentane, -100 deg C to r.t., overnight 3: 77 percent / sodium ethoxide / ethanol / 2 h / Heating View Scheme
参考文献
Kondo, Yoshinori; Kojima, Satoshi; Sakamoto, Takao
Heterocycles, 1996 , vol. 43, # 12 p. 2741 - 2746