Spiroscytalin, a New Tetramic Acid and Other Metabolites of Mixed Biogenesis from Scytalidium cuboideum

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Mitchell Croatt, Assistant Professor (Creator)
Mario Figueroa Saldivar, Adjunct Faculty (Creator)
Nicholas Oberlies, Patricia A. Sullivan Distinguished Professor of Chemistry (Creator)
Cedric J Pearce, Adjunct Professor (Creator)
Huzefa A. Raja, Research Scientist (Creator)
Mansukhlal Chhaganlal Wani (Creator)
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: Spiroscytalin (1), a new tetramic acid that possesses an uncommon spiro-ring fusion between a polyketide-derived octalin ring system and a 2,4-pyrrolidinedione, along with two known compounds, leporin B (2) and purpactin A (3), were isolated from a solid phase culture of the fungus Scytalidium cuboideum (MSX 68345). The molecular connectivity of 1–3 was determined using NMR spectroscopy and mass spectrometry. The relative configurations of 1 and 2 were determined by NOESY experiments. The absolute configuration of 1 was determined by electronic circular dichroism (ECD) via a combination of experimental measurements and computational calculations. While leporin B was known, it displayed activities that had not been reported previously, including cytotoxicity against three human tumour cell lines and antibacterial activity against Candida albicans and Staphylococcus aureus.

Additional Information

Tetrahedron, 71(47), 8899-8904
Language: English
Date: 2015
Tetramic acid, Leporin B, Purpactin A, Scytalidium cuboideum

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