A simple and facile stereoselective synthesis of (Z)- and (E)-allyl halides catalyzed by silica supported sodium hydrogen sulfate: factors influencing the yields and stereochemistry of allyl halides
作者:Biswanath Das、Joydeep Banerjee、Nasi Ravindranath
DOI:10.1016/j.tet.2004.07.022
日期:2004.9
A simple, mild and efficient stereoselective synthesis of (Z)- and (E)-allyl bromides and iodides has been developed by treatment of the Baylis–Hillman adducts with lithium bromide and iodide, respectively, in methylene chloride catalyzed by silica supported sodium hydrogen sulfate at room temperature. The role of various solvents, different reacting metallic halides, nature of the adducts and activity
一种简单,温和且有效的立体选择合成(Z)-和(E)-烯丙基溴化物和碘化物的方法是,通过在二氧化硅负载的氢气钠催化下的二氯甲烷中分别用溴化锂和碘化物处理Baylis-Hillman加合物,从而开发了一种立体选择性合成方法。在室温下为硫酸盐。彻底研究了各种溶剂,不同的金属卤化物反应,加合物的性质以及几种非均相催化剂对产物的收率和立体化学的作用。