Development of efficient method for construction of medium-sized heterocycles based on endo mode cyclization

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The base-catalyzed the endo mode ring-closing reaction of 1-allenyl sulfoxides having a suitable alkyl side chain with the4erininal oxygen atom proceed as to afford the corresponding 5〜7-menibered oxacycles.Changing the sulfinyl group of the allenes to ths sulfonyl group brought some improvement resulting in the formation of 5〜8-membered oxacycles.This novel endo mode ring-closing reaction of allenes was applied to the congeners possessing the terminal nitrogen functionality and active methane group to give the corresppnding cyclized products in acceptable yields.Thus, this method was demonstrated to be applicable to various kinds of allenes.