反应条件
water; toluene-4-sulfonic acid 1.) THF, dioxane, ether, -50 deg C, 16 h, 2.) THF, reflux, 30 min; Multistep reaction. Title compound not separated from byproducts;
参考文献
Takahashi; Tsubuki; Higashiyama
Chemical and Pharmaceutical Bulletin, 1991 , vol. 39, # 12 p. 3136 - 3169