A FORMAL [4+1] CYCLOADDITION OF DIMETHOXYCARBENE TO 3-PERFLUOROACYL-4<i>H</i>-CHROMENES: THE SYNTHESIS OF ARENO-CONDENSED 7,7a-DIHYDRO-4<i>H</i>-FURO[3,4-<i>b</i>]PYRANS
DOI:
https://doi.org/10.1007/7220Keywords:
dihydrofuro[3, 4-b]chromenes, dimethoxycarbene, 3-perfluoroacyl-4H-chromenes, Warkentin's oxadiazoline, [4 1] cycloaddition.Abstract
The [4+1] annulation of in situ generated dimethoxycarbene to 3-trifluoroacetyl-4H-chromenes led to cyclic ortho esters, trifluoromethyl-substituted dihydrofuro[3,4-b]chromenes. In the case of 2-perfluoroacyl-1H-benzo[f]chromenes, representatives of a new heterocyclic system 7a,8-dihydro-11H-benzo[f]furo[3,4-b]chromene, were formed.
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Published
2023-02-21
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Short Communications