Keywords
1-halo-1-nitroethenes
furo[32-c]chromenes
furo[32-c]pyrans
heterocyclization
nitroacrylates
Abstract
Novel 4-oxo-4H-furo[3,2-c]pyran-3-carboxylates and 4-oxo- 4H-furo[3,2-c]chromene-3-carboxylates were prepared from available alkyl 3-bromo-3-nitroacrylates and 4-hydroxy-6- methyl-2H-pyran-2-one or 4-hydroxycoumarin, respectively. Their structures were confirmed by NMR and X-ray data.
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