摘要:

A utilization of the selective INEPT experiment in which polarization transfer is effected through the chelated hydroxyl groups is described for the structure elucidation of two isomeric chromene derivatives, drummondin C (1) and isodrummondin C (2) fromHypericum drummondii(Grev. & Hook.) T. & G.

ISSN:1057-5634    

DOI:10.1080/10575639408044038

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Tedanalactam, a novel δ-lactam not found in previous studies ofTedania ignisfrom Bermuda, was isolated fromT. ignisfrom the Florida Keys.

ISSN:1057-5634    

DOI:10.1080/10575639408044039

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new antimicrobial substance qingjingmycin A, has been isolated from the broth of a hybrid strain FM3–32 derived fromS. qingfengmyceticusandS. hydroscopicus var. jinggangensis. The structure was established by1H COSY, TOCSY, HETCOR, selective INEPT and ROESY nmr studies, and its absolute structure was determined on the basis of spectral data together with amino acid analysis and HPLC analysis of the hydrolysis mixture of qingjingmycin A.

ISSN:1057-5634    

DOI:10.1080/10575639408044040

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

-Investigation of major metabolites secreted by the fungusCeratocystis fimbriata coffea(Halsted1) in itsin vitrocultures afforded five isocoumarins, 6,8-dihydroxy-3-(2-hydroxypropyl) isocoumarin (1), 6-methoxy-8-hydroxy-3-hydroxymethylisocoumarin (2), 6,8-dihydroxy-3-hydroxymethylisocoumarin (3), 6-methoxy-8-hydroxy-3-methylisocoumarin (4) and 6,8-dihydroxy-3-methylisocoumarin (5). Most of these compounds showed toxic activity against coffee tree leaves.

ISSN:1057-5634    

DOI:10.1080/10575639408044041

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new anthraquinone had been isolated from the pods ofCassia grandisLinn. and was identified as 1, 3, 4 -trihydroxy - 6, 7, 8 - trimethoxy - 2-methyl anthraquinone. The structure of this pigment was elucidated by chemical and spectroscopic methods and finally confirmed by its synthesis.

ISSN:1057-5634    

DOI:10.1080/10575639408044042

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Extraction of the branches ofGarcinia dulcisafforded a xanthone with a novel oxygenation pattern [1,4,6-trihydroxy-5-methoxy-7-(3-methylbut-2-enyl)xanthone] in addition to the triterpenoid friedelin and the known flavonoids 3′-(3-methylbut-2-enyl)naringenin, I3,II8-biapigenin and podocarpusflavoneA. The structures were determined by a combination of 2D homo- and heteronuclear NMR correlation spectroscopy and NOE difference spectroscopy.

ISSN:1057-5634    

DOI:10.1080/10575639408044043

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The oxymethine chiral centers,i. e., C-26, C-28 and C-29 positions, of tetrahydrofuranic acetogenins have been determined by advanced Mosher method focusing on the chemical shift of the terminal methyl group.

ISSN:1057-5634    

DOI:10.1080/10575639408044044

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Two new sesquiterpenes 7α, 8α, 13, 14-tetrahydroxy-marasm-5-oic acid γ-lactone, and 10β-hydroxy-lactarorufin A as well as the known dipeptidecyclo-L-prolyl-L-leucyl were isolated by multiple chromatography of the ethanolic extract ofLactarius vellereus.

ISSN:1057-5634    

DOI:10.1080/10575639408044045

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new diterpene (1) has been isolated from a soft coralSarcophyton trocheliphorumand its structure was established by interpretation of spectral data.

ISSN:1057-5634    

DOI:10.1080/10575639408044046

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new C19diterpene alkaloid, 6-deacetyl-10-hydroxyperegrine was isolated fromDelphinium peregrinumtogether with previously obtained compounds.

ISSN:1057-5634    

DOI:10.1080/10575639408044047

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor