Metalations utilizing aryllithiums; ortho-functionalization of p-bromoanisole (pBrA)
作者:D.W. Slocum、Troy L. Reece、Rebecca D. Sandlin、Thomas K. Reinscheld、Paul E. Whitley
DOI:10.1016/j.tetlet.2009.01.104
日期:2009.4
An ortho-metalation protocol has been developed, which permits the survival of a bromine substituent in p-bromoanisole. Eight derivatives of the generated ortho-lithiated intermediate have been prepared. A neglected metalation concept is being explored here: one which proposes that minimizing the pK(a) difference between the aryl substrate and the conjugate acid of the metalating agent will lead to a regiospecific and selective metalation process. Published by Elsevier Ltd.