<i>ortho</i>
‐Allylation of 1‐Arylpyrazoles with Allyl Phenyl Ether
<i>via</i>
Iron‐Catalyzed CH Bond Activation under Mild Conditions
作者:Sobi Asako、Jakob Norinder、Laurean Ilies、Naohiko Yoshikai、Eiichi Nakamura
DOI:10.1002/adsc.201400063
日期:2014.5.5
An iron salt and a bipyridine‐type ligand catalyze the ortho‐allylation of 1‐arylpyrazoles and congeners with allyl phenyl ether under mild conditions (0 °C). The ligand, an organozinc base, and the nature of the allylating reagent are crucial for the success of this reaction. Under these conditions, a competitive phenylation reaction is largely retarded, and cross‐coupling of the organozinc with the
铁盐和联吡啶型配体在温和的条件下(0°C)催化1-芳基吡唑和同类物与烯丙基苯基醚的邻位烯丙基化。配体,有机锌碱和烯丙基化试剂的性质对于该反应的成功至关重要。在这些条件下,竞争性苯基化反应被大大延迟,有机锌与烯丙基亲电子试剂的交叉偶联被最小化。该反应可以进行经由铁-催化的邻Ç ħ活化以形成金属中间,然后与烯丙基醚在γ选择性的方式发生反应。