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A new furanopyrone derivative, (−)-etharvensin ( 1 ), was isolated from the stem bark of Goniothalamus arvensis . Semisynthesis of the 7-ethoxyfuranopyrone 1 was achieved by addition of EtOH in concentrated acid medium to the unsaturated α-pyrone (+)-altholactone ( 2 ). This protocol constitutes a novel, direct (single-step), and efficient method to prepare this class of bioactive compounds.
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Bermejo et al. (1997) studied this question.
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