Acid-promoted opening of 4,5- and 3,4-epoxy eudesmane scaffolds from α-isocostic acid

Add time:07/25/2019    Source:sciencedirect.com

The acid-catalyzed rearrangement of epoxide 3a and 8a derived from sesquiterpernic isocostic acid (1), the main component of Dittrichia viscosa, was studied using Lewis and Brönsted acids. Several new compounds were obtained with different selectivities depending on the catalyst used. These compounds were fully characterized by spectroscopic methods, and mechanistic explanations for their formation are proposed.

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