A Practical Transition Metal-Free Aryl-Aryl Coupling Method: Arynes as Key Intermediates
作者:Frédéric R. Leroux、Laurence Bonnafoux、Christophe Heiss、Françoise Colobert、Don Antoine Lanfranchi
DOI:10.1002/adsc.200700211
日期:2007.12.10
and, stabilization of the resulting 2-biaryllithium intermediate by in situ transfer of bromine or iodine from the starting material. This straightforward transitionmetal-free access to biaryls allows the preparation of highly valuable halobiaryls on a gram scale in excellent yields. These precursors can be subsequently functionalized by highly regioselective halogen/metal permutations into a vast