Abstract
The structures of enhydrin ( 2) and the co-occurring sesquiterpene lactones, viz. fluctuanin ( 3) and fluctuadin ( 4) isolated from Enhydra fluctuans Lour have been established. The stereochemistry of enhydrin has been suggested from NMR data. Selective hydrolysis of the acetate and the glycidate group in 2 yielded the alcohols 11 and 16 indicating acyl migration during their formation. Acetylation of 11 led further to acetolysis of the glycidate ester function to afford the diacetate 17. The location of the two acyl groups in 2 (and also in 3 and 4) still remain to be settled.
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