摘要:

Two new eudesmanolide lactones (1and2) were isolated from the flowers ofWedelia paludosa. The structures of these sesquiterpenoids were elucidated from spectral data.

ISSN:1057-5634    

DOI:10.1080/10575639408043884

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Sciodole, a 1,7′-bi-5-methoxy-2,4-dimethylindole derivative, was isolated from fruit bodies ofTricholoma sciodes. Its structure was determined by spectrocopic methods.

ISSN:1057-5634    

DOI:10.1080/10575639408043885

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A novel homologous series of long chain 1,3-alkanediols, ranging from C26to C32with strong even/odd predominance has been identified in a Miocene (17-20 million years old) deposit of fossil leaves and enclosing sediments by GC-MS. Their structures are confirmed by synthesis of their C28homologue.

ISSN:1057-5634    

DOI:10.1080/10575639408043886

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

8-(1,1-Dimethylallyl)-chrysin and 8-(1,1-dimethylallyl)-3-methylgalangin were synthesized in 70% and 73% yields, respectively, by sigmatropic rearrangement of 7-(3,3-dimethylallyl)-chrysin and 7-(3,3-dimethylallyl)-3-methylgalangin. The rearrangements were performed in a mixture of fused anhydrous sodium acetate and refluxing acetic anhydride as solvent.

ISSN:1057-5634    

DOI:10.1080/10575639408043887

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new steroidal saponin, 1-O-[6-O-acetyl-β-D-galactopyranosyl]-24-O-[β-D-apiofuranosyl-(1→3)-4-O-acetyl-α-L-rhamnopyranosyl-(1→4)-β-D-xylopyranosyl-(1→3)-α-L-arabinopyranosyl]-dracogenin, was isolated from the roots ofHelleborus purpurascensand named dracoside. Structure elucidation was performed by chemical transformations and various spectroscopic methods, mainly 2D NMR techniques (COSY, HMQC, HMBC).

ISSN:1057-5634    

DOI:10.1080/10575639408043888

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A new neolignan hookerinone A (1) along with three other members of the same groupviz. kadsurin A (2), isodihydrofutoquinol A (3) and isodihydrofutoquinol B (4) have been isolated from three IndianPiperspecies. The structure of the new compound has been elucidated as (8R, 1′R or 8S, 1′S)-4-[2-(1, 3-benzodioxolo-5-yl)-1-methylethyl]-2,5-dimethoxy-1-propenyl-2,5-cyclohexadienone, on the basis of 2D- NOESY, HC-COSY, COLOC and other 2D-NMR techniques.

ISSN:1057-5634    

DOI:10.1080/10575639408043889

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Chlorolissoclimide, a monochloro diterpene, was identified inLissoclinum voeltzkowiMichaelsen, a New-Caledonian tunicate. Its structure was determined in relation to that of the previously described dichlorolissoclimide.In vitrocytotoxicity, structure-activity relationships, biosynthetic origin and involvement in human food poisoning are discussed.

ISSN:1057-5634    

DOI:10.1080/10575639408043890

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The absolute stereochemistry of the marine metabolite variabilin (1) has been suggested by degradation. The absolute stereochemistry of related marine metabolites, ircinin-1 (2), ircinin-2 (3), (8E,13Z,20Z)-strobobilin (4) and (8Z,13E,20Z)-strobobilin (5), have beententativelyestablished through comparison of their molecular rotations with those for variabilin.

ISSN:1057-5634    

DOI:10.1080/10575639408043891

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

(3S,5R,6S,7E,9ξ)-3-Hydroxy-5,6-epoxy-β-ionyl-β-D-glucopyranoside1awas identified in a glycosidic extract obtained from apple tree leaves by XAD-2 adsorption and MeOH elution. After a two-step purification of the crude glycosidic mixture with multilayer coil countercurrent chromatography (MLCCC) the new apple leaf glucoside was characterized as its pentaacetate.

ISSN:1057-5634    

DOI:10.1080/10575639408043892

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Both the enantiomers of frontalin were synthesized from atert-alcohol chiral building block, (R)-2-acetoxymethylglycidol, prepared by an enzyme-catalyzed reaction.

ISSN:1057-5634    

DOI:10.1080/10575639408043893

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor