摘要:

Screening of New Zealand native plants for inhibitors of leucine aminopeptidase led to the isolation of a new phenylpropanoid glycoside ester, 2-O-caffeoyl-D-glucopyranose (1) fromHebe strictavar.atkinsonii(Scrophulariaceae). (1) is a competitive inhibitor of leucine aminopeptidase (Kj=10.5 μM). Two other compounds isolated, 3-methyl-3-(6′-O-caffeoyl-β-D-glucopyranosyloxy)-pentan-5-olide (2) and forsythiaside, 3′″, 4′″-dihydroxy-β-phenethyl-O-α-L-rhamnopyranosyl-(1′ → 6)-4-O-caffeoyl-β-D-glucopyranoside (3), were also shown to be competitive inhibitors with Kjvalues of 3.75 and 8.C μM respectively.

ISSN:1057-5634    

DOI:10.1080/10575639308043843

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The 2-0-β-D-glucopyranoside of 4-(1′,4′-dihydroxy-2′,2′,6′-trimethylcyclohexyl)-but-3-en-2-ol1awas isolated from the juice ofAverrhoa carambolaby XAD-2 adsorption and MeOH elution. After a preseparation of the crude glycosidic extract with multi-layer coil countercurrent chromatography the new natural product was peracetylated, purified by HPLC and characterized as its pentaacetate1b.

ISSN:1057-5634    

DOI:10.1080/10575639308043844

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Two previously unreported polypropionate α-pyrones, phomenin A (2) and B (3), were isolated from culture fluids of the phytopathogenic fungusPhoma tracheiphila, and their structures elucidated essentially by spectroscopic methods. Phomenin A shows phytotoxic activity. Both phomenins A and B are active againstArtemia salina.

ISSN:1057-5634    

DOI:10.1080/10575639308043845

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Growth and alkaloid formation of hairy roots ofRauwolfia serpentinaandRauwolfia vomitoriawere compared with that of well established cell suspension cultures ofRauwolfia serpentinaand differentiated plants. Cell suspensions revealed clearly better growth - twice of the dry weight observed for the root culture. The hairy roots do not produce the major indole alkaloids typical for the root bark ofRauwolfiaplants and synthesize besides vinorine and perakine two of the alkaloids formed in cell suspensions (vomilenine and ajmaline). The total yield of alkaloids of the cell culture is about 3.6-fold higher as compared with the root culture.

ISSN:1057-5634    

DOI:10.1080/10575639308043846

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Two isoprenoid fatty acids, 4,8,12-trimethyltridecanoic and 5,9,13-trimethyltetradecanoic, were identified in all specimens studied of the Senegalese spongesCinachyrella allocladaandC. kükenthaliand the New-Caledonian spongeCinachyrellaaff.schulzei. The fatty acids were identified as methyl esters or N-acyl pyrrolidides by gas chromatography/mass spectrometry analyses. 4,8,12-Trimethyltridecanoic acid was found to be the major component in all Senegalese sponge fatty acid mixtures(up to 36%). The co-occurrence of these isoprenoid acids may have implications for chemotaxonomy and biosynthetic pathways.

ISSN:1057-5634    

DOI:10.1080/10575639308043847

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Leaves and stems ofAbronia latifolia(Nyctaginaceae) are covered with a sticky material containing several flavonoid aglycones. In addition to some common flavones and flavonols, this exudate contains a novel C-methylated isoflavone (1), named abronisoflavone. This is the first report of the occurrence of an isoflavone in this family.

ISSN:1057-5634    

DOI:10.1080/10575639308043848

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

24-Epicastasterone, a naturally occurring phytohormone of the brassinosteroid type, was transformed by the fungusCochliobolus lunatusto give the corresponding 15β-hydroxylated compound. The structure of this fermentation product was determined by spectroscopic methods, especially NMR investigations.

ISSN:1057-5634    

DOI:10.1080/10575639308043849

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

A newseco-triterpene, buxapapillosin (1) in which ring A has undergone cleavage, has been isolated from the roots ofBuxus papillosa. The compound bears a cyclopropane ring found in manyBuxusalkaloids and is therefore of biogenetic significance. The leaves ofBuxus papillosahave also yielded three known alkaloids, buxamine A, cyclomicrobuxamine and cyclomicrobuxinine, isolated for the first time from this plant.

ISSN:1057-5634    

DOI:10.1080/10575639308043850

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

During investigations of the active principle ofUrginea sanguineaSchinz eight bufadienolides, a steroidal sapogenin and stigmasterol were isolated. The compounds were identified by FAB-MS,1H-NMR- and13C-NMR-studies or comparison with authentic substances as scillirosidin (1), desacetylscillirosidin (2), 12β-hydroxy-scillirosidin (3), 12β-hydroxy-desacetyl-scillirosidin (4), 12β-hydroxy-scilliroside (5), 5α-4,5-dihydro-12β-hydroxy-scillirosidin (6), 12β-hydroxy-scillirosidin-3-one (7), 12β-hydroxy-scilli-rubrosidin-3-one (8) and 7β, 15α-dihydroxy-yamogenin (9). The latter is the first steroidal sapogenin isolated from anUrgineaspecies.

ISSN:1057-5634    

DOI:10.1080/10575639308043851

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

In addition to previously isolated coumarins and lignans, we have isolated a new coumarin, ptilin and two known lignans, matairesinol and arctigenin from the aerial parts ofHaplophyllum ptilostylum.

ISSN:1057-5634    

DOI:10.1080/10575639308043852

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor