Isolation, structure elucidation, and biomimetic total synthesis of versicolamide B, and the isolation of antipodal (-)-stephacidin A and (+)-notoamide B from Aspergillus versicolor NRRL 35600

Abstract

(Chemical Equation Presented) Stereochemically unique: A new prenylated indole alkaloid, (+)-versicolamide B, has been isolated from cultures of Aspergillus versicolor NRRL 35600. The structure has been assigned by 2D NMR experiments, and confirmed by a biomimetic total synthesis. Versicolamide B is the first member of the paraherquamide/stephacidin family of alkaloids found to possess the anti relative stereochemistry at C19. ent-Stephacidin A and ent-notoamide B were also isolated for the first time. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.