使用Ni或Fe催化剂成功地实现了S N 2-选择性格利雅(Grignard)与伯烯丙基二苯基磷酸酯的偶联。与之形成鲜明对比的是,催化量的CuCN·2LiCl促进了S N 2'-选择性偶联反应。在铜催化剂的存在下,立体化学均一的γ-二取代的烯丙基格氏试剂在较少取代的烯丙基末端(α-位)与烯丙基磷酸二苯酯选择性地反应,而不会失去双键的几何形状。
Reactivity of RCu,BF3 and R2 CuLi,BF3 towards allylic acetals and ethers
作者:A. Ghribi、A. Alexakis、J.F. Normant
DOI:10.1016/0040-4039(84)80012-x
日期:——
Organocopper and cuprate reagents associated with Lewis acids, are highly reactivetowards allylic acetals and ethers. Displacements of the alkoxy group occurs by SN2' attack according to the various parameters of the reaction.