1,3-Diethoxycarbonylallene: an active dienophile and ethoxycarbonylketen equivalent in the synthesis of antibiotic C-nucleosides

Abstract
The remarkable ease with which 1,3-diethoxycarbonylallene (1) undergoes cycloaddition with furans and pyrroles, and the ability of this reagent to serve as an ethoxycarbonylketen equivalent are described.

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