C2-Benzylic C(sp3)-H Alkylation of Indoles Enabled by Photoinduced, EDA-Complex-Mediated Radical-Radical
Ying-Ying Hu1, Zhi-Lin Liu1, Hao-Yue Xiang1
1College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
Abstract:
2-Alkylindoles are privileged motifs that serve as versatile intermediates and building blocks in synthetic and medicinal chemistry. Herein, we report a photoinduced, EDA-complex-enabled C2-benzylic C(sp3)-H alkylation of indoles with bromides through radical cross-coupling. This developed protocol provides facile access to 2-alkylindoles from structurally varied 2-methylindoles and bromides under mild reaction conditions with simple operation. Mechanistically, the well-designed EDA complex by rationally leveraging π-electron-rich indole and electron-deficient halide and electronically matched radical cross-coupling is crucial to the success of this new open-shell methodology in the functionalization of indoles.
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