Electrophilic Cyclization of 2-(2 ',3 '-Allenyl)acetylacetates with Iodine Using Calcium Hydride as the Base

[摘要]：A facile and efficient protocol for the synthesis of 4,5-dihydrofuran derivatives via iodine-mediated cyclization of various 2-(2',3'-allenyl)acetylacetates with CaH2 as the base has been developed. The yields range from moderate to good. The resulting products can be used for further elaboration by palladium-catalyzed coupling reactions.

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