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Benzopyrans. Part 30. Synthesis of substituted xanthones from 3-acyl-2-methyl-1-benzopyran-4-ones
C K GHOSH, S SAHANA, A PATRA
Published in -
1993
Volume: 49
   
Issue: 19
Pages: 4127 - 4134
Abstract
The xanthone 8 results from the base catalysed self-condensation of the chromone 1. The chromone 2 gives the xanthones 9 and 11 with sodium and DMF-POCl3 respectively, phenol 14 with NaOMe, and the pyran 22 with 2-thiomethylchromone 6. The enamine 16 on Vilsmeier-Haak reaction affords the chloroxanthone 12. The pyran 15, isolated as a byproduct from the reaction of ω-acetyl-2-hydroxyacetophenone with HC(OEt)3-Ac2O, affords the xanthone 13 by refluxing with NaOMe in MeOH. © 1993.
About the journal
JournalTetrahedron
Publisher-
ISSN0040-4020