Etude physico-chimique de modeles d'alcaloides indoliques. II. Etude par resonance magnetique nucleaire (RMN) de derives methoxyles du tetrahydrocarbazole.

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Two novel alkaloids from american ladybug Hippodamia-convergens (coleoptera, coccinellidae)

During our continuing investigation of Coccinellidae alkaloids [l, 2,3] about 20,000 specimens of Hippodamia convergens were collected in Central California in September 1971. Fractionation of the methanolic extract by solvent partitions and repeated column chromatography afforded two novel alkaloids, hippodamin (I) and convergin (11) in a ratio of about 1 : 2

Distribution et activités des alcaloïdes défensifs des Coccinellidae

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Chemical ecology of arthropods. 9. Structure and absolute configuration of hippodamine and convergine, two novel alkaloids from american ladybug hippodamia convergens (coleoptera- coccinellidae)

In a previous communication (2) the isolation of two defensive alkaloid, hippodamine and convergine, from the American ladybug Hippodamia convergens was reported. A preliminary chemical study (2) led to the hypothesis that hippodamine could be represented by (1), with unknown stereochemistry at carbon atom 2. Convergine was supposed to be a 3a or 6a hydroxyhippodamine

Two novel alkaloids from american ladybug Hippodamia-convergens (coleoptera, coccinellidae)

During our continuing investigation of Coccinellidae alkaloids [l, 2,3] about 20,000 specimens of Hippodamia convergens were collected in Central California in September 1971. Fractionation of the methanolic extract by solvent partitions and repeated column chromatography afforded two novel alkaloids, hippodamin (I) and convergin (11) in a ratio of about 1 : 2

Indole alkaloids XVII: Five dihydroindole alkaloids from Aspidosperma verbascifolium

A study of Aspidosperma verbascifolium has led to the isolation of four known dihydroindole alkaloids: kopsanone [I], kopsanol [II], 3'‐epikopsanol [III], 10‐oxo‐3'‐epikopsanol [IV] and a new natural product: Nα‐formylkopsanol [VII]. Copyright © 1969 Wiley‐VCH Verlag GmbH & Co. KGaA, WeinheimSCOPUS: ar.jinfo:eu-repo/semantics/publishe