A novel, transition metal-free and
one-pot methodology to synthesize
various substituted NH-pyrroles from readily available building blocks
such as secondary alcohols and 2-aminoalcohols is described. The process
is based on the venerable Oppenauer–Woodward oxidation, which
uses benzophenone as an inexpensive reagent to achieve oxidation of
secondary alcohols under mild condition to ketones, further in situ
condensation with aminoalcohol, and oxidative cyclization to the target
pyrrole ring. The reaction occurs under basic conditions, and features
a broad substrate scope combined with very good tolerance for sensitive
functional groups. This method can be used to synthesize various substituted
pyrroles useful as a starting material for broad applications.
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