Cycloaddition—double fragmentation reactions of mesoionic compounds with dimethyl 7-oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylate: synthesis of aromatic heterocycles
Abstract
Cycloaddition–double fragmentation reactions of five-membered mesoionic compounds with an oxa-bicycloheptadiene afford a convenient synthetic route to five- and six-membered conjugated heterocycles.