FORMAL [3+3] CYCLOADDITION REACTION OF 4-HYDROXYTHIOCOUMARIN TO 4<i>Н</i>-CHROMENE-3-CARBALDEHYDES: SYNTHESIS OF THIOCHROMENO[3',4':5,6]PYRANO[2,3-<i>b</i>]CHROMEN-6-ONES
DOI:
https://doi.org/10.1007/5952Keywords:
1H-benzo[f]chromene-2-carbaldehydes, 4-hydroxythiocoumarin, 4Н-chromene-3-carbaldehydes, Knoevenagel condensation, formal [3 3] cycloaddition, electrocyclization.Abstract
A cascade reaction of 4-hydroxythiocoumarin and 4Н-chromene-3-carbaldehydes was developed, consisting of Knoevenagel condensation and oxa-6π electrocyclization in the presence of ammonium acetate as catalyst. A series of polycyclic acetals containing a fused thiocoumarin moiety were obtained.Downloads
Published
2020-10-14
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Section
Short Communications