Nine α‐hydroxyallenes 1/3 were cyclized to the corresponding 2,5‐dihydrofurans 2/4 with complete axis‐to‐center chirality transfer in the presence of 1 mol% of AuBr3 using [BMIM] [PF6] as solvent at room temperature. The gold catalyst/ionic liquid system is air‐stable and recyclable. The leaching of the gold catalyst upon extraction of the product is extremely low (0.03% after five runs).
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Aksιn et al. (2008) studied this question.
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