Consecutive Reactions with Sulfoximines: Straightforward Synthesis of Substituted 5,5-Spiroketals

[摘要]：An efficient synthesis of 5,5-spiroketals (i.e., 1,6-dioxaspiro[4.4]nonane derivatives) is described from 2-(sulfonimidoylmethylene)tetrahydrofurans involving a consecutive epoxide opening/oxa-Michael spiroketalization sequence. This methodology was applied to the very direct synthesis of chalcogran, a beetle pheromone.

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