Regioselective Magnesiations of Fluorinated Arenes and Heteroarenes Using Magnesium‐bis‐Diisopropylamide (MBDA) in Hydrocarbons

摘要

Abstract We report a convenient preparation of a new and storable magnesium amide (iPr2N)2Mg (magnesium‐bis‐diisopropylamide; MBDA) which proved to be especially suitable for the non‐cryogenic magnesiation of fluoro‐substituted arenes and heteroarenes providing arylmagnesium amides (ArMgDA) or bis‐heteroaryl magnesiums (HetAr)2Mg in hydrocarbons. Further reactions with electrophiles (aldehydes, ketones, allylic bromides, aryl halides (Negishi cross‐coupling)) furnished a range of polyfunctional fluoro‐substituted unsaturated building blocks. Several postfunctionalizations were described as well as NMR‐studies confirming the dimeric structure of the base.