Alpha, beta, gamma: Allyl dienol carbonates (1) served as substrates for the title reaction to afford the furanones 2 in both high yields and high enantioselectivities. These furanones were eventually converted into valuable building blocks including γ-tertiary and γ-quaternary furanones (3) as well as β-quaternary butyrolactones (4). This method was used as a key step in the total synthesis of (−)-nephrosteranic acid and (−)-roccellaric acid.
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