Penibruguieramine A, a Novel Pyrrolizidine Alkaloid from the Endophytic Fungus Penicillium sp. GD6 Associated with Chinese Mangrove Bruguiera gymnorrhiza

Organic Letters
2014.0

Abstract

A novel pyrrolizidine alkaloid, penibruguieramine A (1), characterized by an unprecedented 1-alkenyl-2-methyl-8-hydroxymethylpyrrolizidin-3-one skeleton, was isolated from the endophytic fungus Penicillium sp. GD6, associated with the Chinese mangrove Bruguiera gymnorrhiza. The absolute configuration of penibruguieramine A (1) was established by TDDFT ECD calculations of the vacuum and solution conformers, exploiting the transitions of the lactam chromophore. A plausible pathway for its biosynthesis has been proposed.

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