Remote Aromatic Metalation. An Anionic Friedel-Crafts Equivalent for the Regioselective Synthesis of Condensed Fluorenones from Biaryl and m-Teraryl 2-Amides

Article abstract of DOI:10.1021/jo00005a004

Remote metalation (t-BuLi, LDA) of m-teraryl and biaryl amides (Scheme I) constitutes a short and convenient route to a variety of substituted and condensed fluorenones, including aza analogues (Table I) and the natural product, dengibsinin (6a, Scheme II).