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Synthesis 1990; 1990(5): 387-388
DOI: 10.1055/s-1990-26882
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A New and Efficient Synthesis of Coumestan and Coumestrol

Rita Laschober* , Thomas Kappe
  • *Abteilung für Organische Synthese, Institut für Organische Chemie, Karl-Franzens-Universität Graz, Heinrichstr. 28, A-8010, Graz, Austria
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Publikationsdatum:
17. September 2002 (online)

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4-Aryloxy-3-iodocoumarins (4-aryloxy-3-iodo-2H-1-benzopyran-2-one), 4a-c, which are readily available by known procedures starting from 4-hydroxycoumarins 1a,b and diacetoxyiodobenzenes 2a-c; are cyclized with palladium chloride in triethylamine to yield the coumestanes (6H-benzofuran[3,2-c][1]benzopyran-6-ones) 5a-c.