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■ Synthesis and Confirmation of the Structures of Polonicumtoxins A, B and C

Mari Yotsu-Yamashita, Takeshi Yasumoto,* and Viresh H. Rawal*

*Faculty of Agriculture, Tohoku University, 1-1, Tsutsumidori, Amamiya, Aoba-ku, Sendai, 981, Japan

Abstract

Total syntheses of polonicumtoxins A (1), B (2), and C (3) have been completed. The key step of the syntheses involves and aza-Wittig reaction for the construction of the cyclic ketimine. The synthetic compounds were found to be identical in all respects with the natural products, thus confirming their assigned structures.