In a single step a highly functionalized buta-1,3-dienyl-substituted 2,5-dihydrofuran unit can be formed from two different α-allenol derivatives through a novel heterocyclization/cross-coupling sequence (see scheme). The reactions are fast and totally chemo- and regioselective: No homocoupling products or heterocycles other than the five-membered oxacycle are formed.
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Alcaide et al. (2006) studied this question.