摘要:

The metabolites produced by the cup fungusUrnula crateriumgrown in liquid culture were isolated and elucidated by spectral methods.

ISSN:1057-5634    

DOI:10.1080/10575630008043776

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The pattern of incorporation of sodium [1,2-13C2]acetate into cardinalin 21by the fruit bodies of the toadstoolDermocybe cardinalisshows that both halves of the molecule are formed biosynthetically from an octaketide in which the C 3 and C 3′ methyl groups come from the acetate starter unit while the C 1 and C 1′ methyls originate from the terminal methylene group. This folding pattern is opposite to that observed during the biosynthesis of pyranonaphthoquinones in bacteria.

ISSN:1057-5634    

DOI:10.1080/10575630008043777

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The preparation of the natural 6-n-pentyl-2H-pyran-2-one by a general method is reported and about twenty related2H-pyran-2-ones are synthesised.

ISSN:1057-5634    

DOI:10.1080/10575630008043778

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

1,1′-Dimethyl-[2,2′]-bipyridyldiium salt (I) has been isolated and identified as a new natural product from the organic extract of the marine bivalve molluscCallista chione, order Veneridae. The structure of the new natural productIwas proposed on the basis of its MS and NMR spectral data.

ISSN:1057-5634    

DOI:10.1080/10575630008043779

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Two new aromatic compounds have been isolated from the reverse osmosis fraction of the olive mill waste-waters and identified as C6-C2dimers on the basis of their physical features.

ISSN:1057-5634    

DOI:10.1080/10575630008043780

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Two diketopiperazines, cyclo-(L-prolyl-L-glycine) and cyclo-(L-phenylalanyl-4R-hydroxy-L-proline), and 2,4-dibromo-6-chlorophenol were isolated from cultures of the marine bacterium,Pseudoalteromonas luteoviolacea. Cyclo-(L-prolyl-L-glycine) and cyclo-(L-phenylalanyl-4R-hydroxy-L-proline) stimulated antibiotic production in this strain. 2,4-Dibromo-6-chlorophenol showed antibacterial activity against methicillin resistantStaphylococcus aureus(MRSA) and the cystic fibrosis associated pathogenBurkholderia cepacia.

ISSN:1057-5634    

DOI:10.1080/10575630008043781

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Antioxidative activities for lipid peroxidation of C-glycosylflavones isolated from the fruits ofBoreava orientalisand related compounds were studied. C-glycosylflavones, especially isovitexin and isoorientin, were found to be antioxidative constituents of the fruits ofB. orientalis. The activity of isoorientin was stronger than that of isovitexin.

ISSN:1057-5634    

DOI:10.1080/10575630008043782

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The bark extracts ofCalophyllum teysmanniifurnished (-)-ledol (1a) and its structure and stereochemistry were established by 2D NMR and synthesis from (+)-aromadendrene. Inconsistencies of previously reported data on the stereochemistry of (-)-ledol are discussed and corrected.

ISSN:1057-5634    

DOI:10.1080/10575630008043783

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Bioassay-guided fractionation allowed the isolation of two minor, caged cytotoxic tetraprenylated xanthonoids, gaudichaudiones I and J (1and2), from the leaf extract ofGarcinia gaudichaudii. The structures were determined by spectral analysis which provided good agreement with the previously isolated gaudichaudi-one B(3).

ISSN:1057-5634    

DOI:10.1080/10575630008043784

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A new fernane-type triterpene, named integrifolin (1), was isolated and characterized from the aerial parts ofTeucrium integrifolium. The structure of the new compound was deduced to be 3β-hydroxy-fern-9(11)-en-23-oic acid through its spectral properties and X-ray crystallographic analysis.

ISSN:1057-5634    

DOI:10.1080/10575630008043785

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor