Abstract
[reaction: see text] A new, efficient, and general asymmetric synthesis of enantiomerically pure trans-3,4-dialkyl-gamma-lactones has been developed. The key steps are (1) copper-catalyzed three-component coupling of chiral amine, aldehyde, and alkyne, (2) acyl-Claisen rearrangement, and (3) iodolactonization. The products, chiral gamma-lactones, are versatile synthetic intermediates and structural units of natural products and modified nucleosides.
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