Oxygen Heterocycles by Sulphur Ylide Annulation: Synthesis of 3,4-Dihydro-2H,5H-pyrano[3,2-c][1]benzopyran-5-ones by Dimethylsulphoxonium Methylide
- 1 January 1984
- journal article
- Published by The Japan Institute of Heterocyclic Chemistry in HETEROCYCLES
- Vol. 22 (2)
- https://doi.org/10.3987/r-1984-02-0245
Abstract
3,4-Dihydro-2-hydroxymethyl-2H,5H-pyrano[3,2-c][1]benzopyran-5-ones are the main products of the reaction of dimethylsulphoxonium methylide on Michael adducts of 4-hydroxycoumarins and α,β-unsaturated ketones. Minor quantities of 3,4-dihydro-2-hydroxymethyl-2H,5H-pyrano[2,3-b][1]benzopyran-5-ones are also sometimes obtainedKeywords
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