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Pyran is an oxygen-containing six-membered heterocyclic system in which an oxygen atom replaces one carbon atom in a six-membered ring, and is a very important class of heterocyclic compounds. Pyran compounds have a wide range of biological activities, and the synthesis of such compounds is of great significance. It is an important structural core of many natural products such as carbohydrates, polyether antibiotics, marine toxins, and pheromones, and plays a very important role in its biological activity.Tetrahydropyrans are also im... more