https://orcid.org/0000-0001-5306-3396
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Abstract
Two new dimers of ambuic acid, pestaloversicoloric acids A (1) and B (2), and a known derivative, 13(S)-hydroxyambuic acid (3), were isolated from the static fermentation product of Pestalotiopsis versicolor. The structural identification was accomplished via analyses on the data of HR-MS, 1 D and 2 D NMR, and ECD. Different from the well-known exo-type dimer, torreyanic acid, compounds 1 and 2 represent the first example of endo-type product derived from the intermolecular Diels-Alder reaction of two molecules of ambuic acid derivative with the identical absolute stereochemistry.
Disclosure statement
No potential conflict of interests was reported by the author(s).
Additional information
Funding
This work was sponsored by the Natural Science Foundation of Liaoning Province, China [Grant number 2019-ZD-0452].