[2,3]-Wittig Rearrangement Initiated by 1,5-Hydrogen Atom Transfer from an<i>o</i>-Iodophenyl Group on the<i>α</i>-Carbon of Allylic Ethers by Reduction with SmI<sub>2</sub>
作者:Munetaka Kunishima、Kazuhito Hioki、Daisuke Nakata、Shigenobu Nogawa、Shohei Tani
DOI:10.1246/cl.1999.683
日期:1999.7
generated by reduction of an o-iodophenyl group on the allylic position of allyl ethers by SmI2 regioselectively generates α-allyloxy carbanions, which undergo [2,3]-Wittig rearrangement to afford a substituted 4-phenyl-3-buten-1-ol. The effect of HMPA concentration on distribution of the 1,5-hydrogen transfer giving Wittig rearranged products and hydrogen abstraction giving reductive deiodination
通过 SmI2 还原烯丙基醚烯丙基位置上的邻碘苯基基团产生的芳基的分子内 1,5-氢原子转移区域选择性地生成 α-烯丙氧基碳负离子,其经历 [2,3]-Wittig 重排以提供取代的 4-苯基-3-丁烯-1-醇。描述了 HMPA 浓度对产生 Wittig 重排产物的 1,5-氢转移和产生还原性脱碘产物的夺氢分布的影响。