Abstract
AbstractThe products of the one‐pot assembly of ketones and acetylene, 7‐methylene‐6,8‐dioxabicyclo[3.2.1]octanes, congeners of an insect pheromone frontalin, undergo an acid‐catalyzed rearrangement to diastereomerically pure 2‐acetyl‐3,4‐dihydropyrans in excellent yields. The synthesis is realizable in a one‐pot manner procedure directly from ketones and acetylene.
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