Synthesis of hydroxy-6H-benzofuro[3,2-c] [1]benzopyran-6-ones |
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Authors: | H L McPherson B W Ponder |
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Abstract: | The Micheal addition of ethyl 2-methoxy-, 2,4-dimethoxy- and 2,5-dimethoxybenzoylacetates with benzoquinone leads to ethyl 2-(rnethoxy or dimethoxy phenyl)-5-hydroxybenzofuran 3-carboxylates. Treatment of the henzofuran derivatives with anhydrous pyridine hydrochloride at 190–195° leads to hydroxy-6H-henzofuro3,2-c] 1]benzopyran-6-ones. |
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