2,2-Disubstituted Indoxyls via Oxidative Dearomatization: Generalization to 2-Alkylindoles and Application to Alkaloid Synthesis

Abstract

Abstract2,2-Disubstituted indoxyls are commonly found within natural products and bioactive molecules. Among the numerous methods to access such motifs, the dearomative transformation of indoles represents an attractive approach. Despite much development, a potential gap exists in the oxidative union of readily accessible 2-substituted indoles with nucleophilic partners, where a general transformation accommodating 2-alkyl substitution and a broad range of nucleophiles is lacking. Herein, we describe the development of a user-friendly solution to this challenge and highlight its utility in the synthesis of complex alkaloids.1 Introduction2 Synthesis of 2,2-Disubstituted Indoxyls via Dearomatization of Indoles: Background3 Oxidative Dearomatization of 2-Alkylindoles to 2,2-Disubstituted Indoxyls: Development4 Selected Scope and Preliminary Investigations toward an Asymmetric Coupling5 Application to the Total Synthesis of Complex Alkaloids6 Conclusions