Synthése par deux voies différentes d'un systéme dihétérocyclique apparenté aux peltogynoides |
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| Authors: | Colette Deschamps-Vallet,Mich le Meyer-Dayan,Jean Andrieux,Jacques Riboulleau,Bernard Bodo,Darius Molho |
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| Affiliation: | Colette Deschamps-Vallet,Michéle Meyer-Dayan,Jean Andrieux,Jacques Riboulleau,Bernard Bodo,Darius Molho |
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| Abstract: | 5-Oxo-5H,7H-[2]benzopyrano[4,3-b][1]benzopyran ( 2 ) has been synthesized from 3-(o-hydroxybenzylidene)isochroman-1,4-dione ( 3 ) by reductive cyclization, and from 5H,7H[2]benzo-pyrano[4,3-b][1]benzopyran-5,7-dione ( 4 ) by selective hydro-genation. This second method affords the dihydro compound 6 or 6a,12a-dihydro-5H,7H-[2]benzopyrano[4,3-b] [1 ]benzopyran-5-one as reaction time increases. |
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