Highly Regioselective Preparation of Heteroaryl-Magnesium Reagents by Using a Br/Mg Exchange
作者:Christoph Sämann、Benjamin Haag、Paul Knochel
DOI:10.1002/chem.201202230
日期:2012.12.7
Disubstituted thienyl‐, furyl‐ and pyridylmagnesium derivatives are regioselectively prepared from a Br/Mg exchange of the corresponding dibromo compounds by using either iPrMgCl⋅LiCl or hindered arylmagnesium reagents, such as isitylmagnesium bromide⋅lithium chloride (isityl=2,4,6‐triisopropyl‐phenyl) complexed with a diamine ligand, in difficult cases. The selective functionalisations of these heterocyclic
二取代的噻吩基,呋喃基和pyridylmagnesium衍生物区域选择性从对应的二溴化合物的溴/镁交换通过使用制备我PrMgCl ⋅的LiCl或受阻芳基镁试剂,如溴化isitylmagnesium ⋅氯化锂(isityl = 2,4,6 (三异丙基-苯基)与二胺配体络合,在困难的情况下。通过使用Negishi交叉偶联反应,酰化或加成醛,可以轻松实现这些杂环骨架的选择性官能化。