Traceless Directing Strategy: Efficient Synthesis of N‑Alkyl Indoles via Redox-Neutral C–H Activation

Abstract

A general protocol for the synthesis of N-alkyl indoles has been developed via a redox neutral C–H activation strategy using a traceless nitroso directing group. A broad scope of substituted N-alkyl indoles has been prepared in good to excellent yields using a very simple Rh catalyst system in the absence of an external oxidant or any other additive. Good to excellent regioselectivity has been achieved for asymmetrically disubstituted acetylenes