𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Isopsylloborine A, a new dimeric azaphenalene alkaloid from ladybird beetles (Coleoptera: Coccinellidae)

✍ Scribed by Benjamine Lebrun; Jean-Claude Braekman; Désiré Daloze; Plamen Kalushkov; Jacques M. Pasteels

Book ID
104262530
Publisher
Elsevier Science
Year
1999
Tongue
French
Weight
109 KB
Volume
40
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

✦ Synopsis

A new dimeric azaphenalene alkaloid, isopsylloborine A (2), has been isolated from the ladybird beetles Halyzia 16-guttata and Vibidia 12-guttata, and its structure determined by 2D NMR methods. It is a double bond isomer of the recently described psylloborine A (1), which is also present in these beetles as a minor alkaloid.

📜 SIMILAR VOLUMES

Exochomine, a dimeric ladybird alkaloid,
Exochomine, a dimeric ladybird alkaloid, isolated from Exochomus quadripustulatus (coleoptera: coccinellidae).
✍ Michel Timmermans; Jean-Claude Braekman; Désiré Daloze; Jacques M. Pasteels; Joë 📂 Article 📅 1992 🏛 Elsevier Science 🌐 French ⚖ 228 KB

Many spccics of ladybird bccllcs arc protcctcd against predators by bitter alkaloids present in their h;lcmnlpmph' Till now, the mo?t common of thcsc alkaloids [e.g.prccoccinclIinc (l), cnccincllinc (2), hippodnminc (3) or convcrginc Q] belong to the 2-mcthylpcrhydro-9b-azapt~cncre ring systcm2-.< O

Psylloborine A, a new dimeric alkaloid f
Psylloborine A, a new dimeric alkaloid from a ladybird beetle
✍ Frank C. Schröder; Till Tolasch 📂 Article 📅 1998 🏛 Elsevier Science 🌐 French ⚖ 340 KB

A new dimeric alkaloid, psylloborine A (3), was identified from the 22-pointed ladybird beetle Psyllobora vigintiduopunctata (L.). Psylloborine A exhibits an unusual heptacyclic ring system, derived from two azaphenalene units. Structural assignment was based on NMR-spectroscopic methods, using E.CO

Hyperaspine, a new 3-oxaquinolizidine al
Hyperaspine, a new 3-oxaquinolizidine alkaloid from Hyperaspis campestris (Coleoptera: Coccinellidae)
✍ Benjamine Lebrun; Jean-Claude Braekman; Désiré Daloze; Plamen Kalushkov; Jacques 📂 Article 📅 2001 🏛 Elsevier Science 🌐 French ⚖ 64 KB

A new 3-oxaquinolizidine alkaloid (3R\*,4aR\*,6S\*,8R\*)-6-hydroxy-3-methyl-8-pentylperhydropyrido[1,2-c][1,3]oxazine 6-(pyrrole-2-carboxylate) (hyperaspine) has been isolated from the ladybird beetle Hyperaspis campestris and its structure determined by 2D NMR and MS methods.