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A novel meroterpenoid cabagranin D was isolated along with related neolignans cabagranins A-C from the leaves of Piper cabagranum (Costa Rica). Cabagranins A-C represent the first examples of 3,3’-neolignans isolated from the Piper genus of plant and the meroterpenoid cabagranin D, representing an unprecedented Diels-Alder conjugate of an unsubstituted phenylpropenone and alpha-phellandrene. Details of the full structural elucidation of these compounds and a discussion of the potential biosynthetic relationships are presented.
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Oliveira et al. (2023) studied this question.