摘要:

The major flavanol present inPanda oleosacollected in Central Gabon was determined to beent-4′-O-methylgallocatechin, 1. The HIV-inhibitory activity of the extracts was traced to tannins; 1 was inactive in our primary anti-HIV screen.

ISSN:1057-5634    

DOI:10.1080/10575639408043898

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The complete stereochemical structure of syringomycin, a bioactive lipodepsipeptide produced byPseudomonas syringaepv.syringae, was determined and compared to related phytotoxins.

ISSN:1057-5634    

DOI:10.1080/10575639408043899

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Magellanin, a new triterpene dimer was isolated fromMaytenus magellanica. Its structure was elucidated by spectroscopy based on a novel unit combination.

ISSN:1057-5634    

DOI:10.1080/10575639408043900

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Bioassay-guided fractionation of the ethyl acetate extracts of the culture filtrate of the fungal culture HA 137–89 yielded the two salicylic acid derivatives1and2, as inhibitors of the binding of35S-TBPS to the GABAA/benzodiazepine chloride channel receptor complexin vitro.Their structures were determined by spectroscopic and chemical methods.

ISSN:1057-5634    

DOI:10.1080/10575639408043901

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Fresh undried winter leaves ofAzadirachta indicawere fed with [2-14C, 4R-3H1] MVA. Atomic and isotopic ratios in nimocinol & nimocinolide, thus isolated showed the loss of one14C from the side chain and four tritium atoms - one from side chain and three from apotetracyclic triterpene skeleton. The biosynthetic pathway thus established suggested the involvement of euphol (Δ8,9compound) which is isomerised to butyrospermol (Δ7,8compound) followed by an apo-rearrangement during which one methyl migrates from C-14 to C-8 and double bond from C-7 to C-14.

ISSN:1057-5634    

DOI:10.1080/10575639408043902

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new cycloartanelactone glucoside, Juncoside I, has been isolated fromJuncus effususand its structure has been determined by chemical and spectroscopic studies.

ISSN:1057-5634    

DOI:10.1080/10575639408043903

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

While investigating the ring opening-closure process of the C ring of catharanthine (2), a new type of dimer (5) and two rearranged “monomeric” compounds (3,4) have been obtained. In the course of the coupling process of the rearranged iboga-skeleton monomer (3) with vindoline (6) in the presence of ferric chloride in aqueous media three dimer compounds (7,8 and 9) have been produced.

ISSN:1057-5634    

DOI:10.1080/10575639408043904

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new dihydroxysterol, named Lawsaritol A (1), has been isolated from the roots ofLawsonia inermisand its structure has been elucidated by spectral analysis and chemical evidences.

ISSN:1057-5634    

DOI:10.1080/10575639408043905

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Alarm pheromones, Navenones A, B and C 1a-c are synthesized in a one pot reaction by the means of a powerful polyvinylogation reagent the 6-lithio-1-methoxyhexa-1,3,5-triene 3.

ISSN:1057-5634    

DOI:10.1080/10575639408043906

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Pleurotin, dihydropleurotinic acid and leucopleurotin, metabolites previously isolated from cultures of aHohenbueheliaspecies, were obtained from cultures of the nematode-trapping deuteromyceteNematoctonus robustus. Crystals suitable for X-ray analysis were obtained from dihydropleurotinic acid. All three compounds exhibited antibacterial, antifungal and cytotoxic but no nematicidal activities. The production of these compounds byNematoctonus, a known anamorph ofHohenbueheliareveals also a close chemotaxonomic relationship between the sexual and imperfect stage of these basidiomycetes.

ISSN:1057-5634    

DOI:10.1080/10575639408043907

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor