Martin P. Kunstmann

Some new terpenoid metabolites from an unidentified fusarium species

Abstract Six new terpenoids of mixed biogenetic origin exhibiting anti- Tetrahymena pyriformis activity have been isolated from an unclassified Fusarium species designated LL-Z1272. The structures of these metabolites, named LL-Z1272α, β, γ, δ, e and ζ, are composed of an orcyl aldehyde unit condensed with a farnesyl side chain which in γ, δ, e and ζ, is terminally cyclized to a cyclohexanone ring. All but β and e contain a chlorine atom in the aromatic portion of the molecule.

Structures of methyl aldgarosides A and B obtained from the neutral macrolide antibiotic aldgamycin E

Abstract The methanolysis of aldgamycin E yields, in addition to methyl mycinoside, two anomeric carbonate containing methyl glycosides, A and B. The structures of the two carbonate sugars have been elucidated and found to belong to the D series.

The structure of neutramycin

Für das Antibiotikum Neutramycin wird die Strukturformel I abgeleitet.

Diketopiperazines from fermentations: Metabolites, artifacts, or both

Es wird gezeigt, dass Diketopiperazine, insbesonderel-Leucyl-l-prolin-anhydrid, eher aus dem Medium stammende Artefakte als echte mikrobielle Stoffwechselprodukte sind.

Isolation and structure of 2,4-dihydroxy-3,5,6-trimethylbenzoic acid fromMortierella ramanniana

Aus KulturenMortierella ramanniana var.angulispora (Naumov) Linnemann wurde 2,4-dihydroxy-3,5,6-trimethylbenzoesäure isoliert. Auf Grund seiner chemischen und physikalischen Eigenschaften wird ihm die Strukturformel I erteilt.

Conversion of a pimarane diterpene into the cleistanthane ring system

The acid-catalysed migration of the C-13 vinylidene grouping to C-14 in a pimarane diterpene is reported.