Generation of functionalized aryl and heteroaryl aluminum reagents by halogen–lithium exchange
作者:Thomas Klatt、Klaus Groll、Paul Knochel
DOI:10.1039/c3cc43356k
日期:——
Various functionalized aryl and heteroaryl aluminum reagents were obtained by performing IâLi or BrâLi exchange reactions with the corresponding unsaturated organic halides in the presence of i-Bu2AlCl. By means of an appropriate catalyst, the resulting new aluminum species were directly acylated, allylated or arylated. 1,4-Michael additions to enones have also been achieved.
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/Mgexchange 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