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Synthesis of the structure claimed for puetuberosanol 1 (using the Julia-Colonna oxidation in a key step) showed that the natural product was a different material. The isomeric epoxy alcohols 16-18 can be discounted from the alternatives. An analogue 19 of marshrin 2 was prepared but the synthesis of the natural product was thwarted by failure of a Julia-Colonna oxidation in the key step. The epoxy...
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