中環状チオノカルボナートの［３，３］シグマトロピー転位を経由した環拡大反応

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  • (3,3)Sigmatropic Ring Expansion of Cyclic Thionocarbonates of Medium Ring-Size.
  • チュウ カンジョウ チオノカルボナート ノ 3 3 シグマトロピー テンイ オ

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A highly stereoselective synthesis of (Z) - or (E) -double bonds in 10-membered thiolcarbonates is achieved by the [3, 3] sigmatropic rearrangement of 8-membered thionocarbonates which proceeds through the chairlike vs. boatlike transition states. The formation of the 8-membered intermediates followed by their [3, 3] sigmatropic rearrangements were investigated by experiments and theoretical calculations. Their utilities of this methodology have been demonstrated by the unique and stereoselective synthesis of (-)-yellow scale pheromone. Moreover, medium-membered heterocyclic allenes were synthesized by this method. The structure and reactivity of a new type of strained 8-membered allene were also examined. Using this method combined with a novel application of the newly developed SmI2-HMPA reduction of the cyclic allene, the antifungal constituent of a Sapium japonicum was synthesized.

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