Synthesis of 3-Acyl and 3-Carboalkoxyfurans by the Ceric Ammonium Nitrate Promoted Addition of 1,3-Dicarbonyl Compounds to Vinylic Acetates

References

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• March , J. 1977 . “Advanced Organic Chemistry” , 82 New York : McGraw-Hill . 1 hr reflux, in toluene, in the presence of p-toluenesulfonic acid, was sufficient in our case
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• Solid 1,3-dicarbonyl compounds are dissolved in a small amount of acetone
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• This step is useful to increase the yield in dihydro-furan derivatives, in so far as it favors the ring closure with displacement of nitrate ion of the first formed adduct RCCOR'OCHCHR CONO2 HOCOCH3. Sodium bicarbonate is needed to neutralize nitric acid which forms in this step
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