Diastereoselective Synthesis of 6-Trifluoromethyl-5,6-dihydropyrans via Phosphine-Catalyzed [4+2] Annulation of alpha-Benzylallenoates with Ketones

[摘要]：The highly diastereoselective synthesis of 6-trifluoromethyl-5,6-dihydropyrans was realized by the phosphine-catalyzed [4 + 2] annulation of ethyl alpha-benzylallenoates and trifluoromethyl ketones.

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