Alkylation-Terminated Catellani Reactions Using Alkyl Carbagermatranes

The Catellani reaction has received substantial attention because it enables rapid multiple derivatization on aromatics. While using alkyl electrophiles to achieveortho-alkylation was one of the earliest applications of the Catellani reaction,ipso-alkylation-terminated reactions with beta-H-containing reactants has not been realized to date. Herein, we report alkylation-terminated Catellani reaction using alkyl carbagermatranes (abbreviated as alkyl-Ge) as nucleophiles. The reactivity of alkyl-Geand alkyl-B(OH)(2)in this reaction is discussed. This approach enables efficient dialkylation with beta-H-containing reactants, which was previously inaccessible by Catellani reactions.