New tetracyclic 1,4-oxazepines constructed via practically simple tandem condensation strategy from readily available synthons
摘要:
A streamlined synthetic methodology towards novel tetracyclic 1,4-oxazepines from readily available precursors is described. The compounds, designed as more soluble version of the earlier described, poorly soluble dibenzo[bf][1,4]oxazepines, were obtained in high yields and as a single regioisomer as a result of three tandem chemical events-nucleophilic aromatic substitution, Smiles rearrangement and denitrocyclization. (C) 2014 Elsevier Ltd. All rights reserved.
Dibenzo[b,f]pyrazolo[1,5-d][1,4]oxazepines: Facile Construction of a Rare Heterocyclic System via Tandem Aromatic Nucleophilic Substitution-Smiles Rearrangement-Denitrocyclization
摘要:
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.