As part of a broad study of the use of p-oxycyclopropylcarbonyl compounds, prepared by the transitionmetal-catalyzed decomposition of a-diazocarbonyl compounds in the presence of enol derivatives, in organochemical synthesis3 it was shown some time ago that, contrastingly, the decomposition of a-diazo-0-dicarbonyl compounds under similar conditions led to dihydrofurans, which were convertible readily into j3-acylfurans.4 In order to explore the generality of this experience, it was decided to study this two-step furan synthesis with the use of the least substituted a-diazo-@-dicarbonyl compounds, i.e., ethyl formyldiazoacetate (1): diethyl oxalyldiazoacetate (2): and diazomalonaldehyde (3).'
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