Synthesis of functionalized 7-azaindoles via directed ortho-metalations ☆

Functionalization at C-5 of 4-fluoro- and 4-chloro-1-triisopropylsilyl-7-azaindole, 1 and 2, respectively, leads to a variety of new substituted 7-azaindole derivatives. We also describe two approaches to introduce functionality at C-6.