W(CO)(5)(L)-Catalyzed Cyclization of alpha-Alkynyl-beta-dicarbonyl Derivatives: Synthesis of Methylenelactones, Furans, and Methylenecyclopentanes

[摘要]：W(CO)(5)(L)-Catalyzed cyclization of alpha-alkynyl-beta-keto acids, keto esters, and diketones provides methylenelactones, furans, and methylenecyclopentanes via 5-exo-dig cyclization. Also, the present approach can be further applied to 5-endo-dig cyclization.

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