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Oxygen heterocycles by sulphur ylide annulation: Synthesis of 3,4-dihydro-2H,5H-pyrano[3,2-C][1] benzofyran-5-ones by dimethylsulphoxonium methylide

Heterocycles, ISSN: 1881-0942, Vol: 22, Issue: 2, Page: 245-248
1984
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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 obtained.

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