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Efficient synthesis of (±)-de-O-methyllasiodiplodin
Jesus M Madrigal Lombera1, Ian B Seiple1
1Department of Pharmaceutical Chemistry and Cardiovascular Research Institute, University of California, San Francisco, CA 94158, USA.
None:
Resorcinolic macrolides are a large class of fungal natural products with conserved resorcinolic ester cores within highly variable ten- to fourteen-membered macrocycles. They exhibit a broad range of biological activities, depending largely on the size and substitution on the macrocycle bridge. Here, we report a protecting group-free synthesis of (±)-de-O-methyllasiodiplodin, a minimal resorcinolic macrolide derived from the fungus Lasiodiplodia theobromae. The route proceeds in 42% yield over 5 steps (longest linear sequence) from 9-decenoic acid, a cheap and abundant starting material. Given the broad commercial availability of a variety of similar (terminal)-enoic acids, this route provides an entry to libraries of resorcinolic macrolides with highly variable macrocycle bridges.
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