C3-Functionalization of indoles with α-heteroaryl-substituted methyl alcohols
Ethan J Pazur1, Nikhil R Tasker1, Peter Wipf1
1Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA. pwipf@pitt.edu.
Abstract:
The transition metal-free Cs2CO3/Oxone®-mediated C3-alkylation of indoles proceeds in moderate to high yields with a variety of C4-C7 functionalized indoles and is applicable to 2-, 3- and 4-hydroxymethyl pyridines and related electron-deficient heterocycles, permitting novel late-stage drug functionalizations. Preliminary mechanistic studies support a hydrogen autotransfer-type chain process starting with an initial oxidation of the alcohol to the corresponding aldehyde, followed by a subsequent condensation onto indole and reduction/hydride delivery from another equivalent of the primary alcohol.
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