摘要:

(+)-Bakuchiol was synthesized by using the diastereoselective alkylation of (−)-3-arylthio-5-trimethylsilylcyclohexenone as the key-step for the construction of the chiral quaternary carbon center.

ISSN:1057-5634    

DOI:10.1080/10575639908045426

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new bidesmosidic pentacyclic triterpenoid saponin, oleragenoside, was isolated fromSpinacia oleraceaL. plants (1). Its novel aglycone, representing 2-hydroxy-gypsogenin, was named oleragenin. The structure was established on the basis of spectral data as oleragenin-28-O-β-D-glucopyranoside-3-β-O-D-glucuronopyranoside.

ISSN:1057-5634    

DOI:10.1080/10575639908045427

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

We have isolated and characterized a new macrocarpal named macrocarpal K, an isopentylphloroglucinol-β-eudesmol adduct. We have also tested six macrocarpals, including macrocarpal K for attachment-inhibiting activity against the blue musselMytilus edulis galloprovincialis. Macrocarpals A, B, E, am-1, H and K showed potent attachment-inhibiting activity against the blue mussel, which was 1–3 times higher than the standard antifoulant CuSO4.

ISSN:1057-5634    

DOI:10.1080/10575639908045428

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A novel cyclic ether, 5,10-epoxymuurolane (1), along with the sesquiterpene isosericenine (2) have been isolated, purified and identified from the organic extract of the gorgonian soft coralGorgonia ventalina. The structure of the new natural product1was proposed on the basis of its spectral data, including 2D NMR experiments.

ISSN:1057-5634    

DOI:10.1080/10575639908045429

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new eremophylane-type sesquiterpene, the known compounds salvicanol, pisiferanol, 8(14),15-isopimaradien-7α-ol, β-sitosterol and natural 5α,6-dihydro-salviasperanol have been isolated from the root extract ofSalvia mellifera. The structure of the new sesquiterpene was identified by rigorous spectroscopic analyses.

ISSN:1057-5634    

DOI:10.1080/10575639908045430

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Stemphytriol, a new member of the octahydroperylene stemphyl- and altertoxins was isolated from the endophytic fungusMonodictys fluctuata.

ISSN:1057-5634    

DOI:10.1080/10575639908045431

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A novel flavone C-glucoside, telephioidin (1), was isolated fromPolygala telephioides. Its structure was established by extensive 1D and 2D NMR measurements. Rhoifolin (2) was isolated fromPolygala arvensisand polygalitol from both plants.

ISSN:1057-5634    

DOI:10.1080/10575639908045432

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new staurosporine analog, 4′-N-demethyl-11-hydroxystaurosporine (1), has been isolated by cytotoxicity-guided fractionation of an organic extract of the prosobranch molluskCoriocella nigra. The known staurosporine derivative 3,11-dihydroxystaurosporine (2) was also isolated from this extract. Concurrent investigations ofCoriocella hibyaeresulted in the isolation of two known compounds, lamellarins C (3) and U (4). The structures of1, 2, 3 and 4were elucidated by spectroscopic methods and the compounds were evaluated for cytotoxicity against 10 human tumor cell lines. Compounds1and2demonstrated potent cytotoxic activity with IC50's ranging from approximately 2 to 66 ng/mL.

ISSN:1057-5634    

DOI:10.1080/10575639908045433

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Two new coumarins were isolated from the methanol extract of the leaves ofClausena heptaphylla. Their structures were established as lunamarin A (1) and lunamarin B (2) on the basis of spectral data, including 2D NMR.

ISSN:1057-5634    

DOI:10.1080/10575639908045434

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The presence of jasmonic acid (JA) was searched in the bacteriumEscherichia colinon-pathogenicRC424strain and in the pathogenicRC-7strain. In addition, JA was screened in plant bacteria such asAzospirillum sp., Bacillus cereus, Bradyrhizobium sp. GB2andP53, Rhizobium meliloti, and in their respective culture media. Our results demonstrated that both strains ofEscherichia colisynthetize jasmonic acid and release this compound to the culture medium. Jasmonic acid was also identified as an endogenous compound of yeast (Saccharomyces cerevisiae) used in the medium. The fatty acid linolenic acid, precursor of JA in higher plants, was not found, suggesting a different biosynthetic pathway in these microorganisms. By contrast, other bacteria metabolized the jasmonic acid supplied by the yeast to the culture medium.

ISSN:1057-5634    

DOI:10.1080/10575639908045435

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor