A. Sapegin, S. Kalinin, A. V. Smirnov
Aug 1, 2012
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Synthesis
Abstract
Condensation of 2-(1H-pyrazol-5-yl)phenols with 1-chloro-2-nitrobenzenes under basic conditions in N,N-dimethylformamide results in a tandem, atom-economical, aromatic nucleophilic substitution–Smiles rearrangement–denitrocyclization process to provide pyrazolo-fused dibenzo[b,f][1,4]oxazepines as a single regioisomer.