反应条件
phosphoric acid; toluene-4-sulfonic acid 1.) 60 deg C, 3 h, 2.) DMF, 60 deg C, 20 h; Yield given. Multistep reaction;
参考文献
Hirano, Shigeo; Takagi, Seiji; Hiyama, Tamejiro; Nozaki, Hitosi
Bulletin of the Chemical Society of Japan, 1980 , vol. 53, # 1 p. 169 - 173