摘要:

Synthesis of both enantiomers ofcis-3-methyl-4-decanolide 2 was achieved starting from enantiomers of (1S,5R)-2-oxabicyclo[3.3.0]-oct-6-en-3-one 4 in 8 steps. Both enantiomers were separated by GC analysis using a capillary column with a chiral stationary phase. Direct comparison of the synthetic enantioners with natural product is upon the recollection of scent mixture.

ISSN:1057-5634    

DOI:10.1080/10575639908048793

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Two new secoiridoid glucosides, trans- 10-(cinnamoyloxy) oleoside dimethylester (methyl jasminoside) and cis-10-(cinnamoyloxy) oleoside monomethyl ester, and two new iridoids, 1α-and 1β-, 7-dehydrologanetin, together with the known iridoid jasminoside were isolated from leaves ofJasminum odoratissimum.the structures of these compounds have been characterised on the basis of spectroscopic evidence.

ISSN:1057-5634    

DOI:10.1080/10575639908048794

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Two new compounds, spatosterol (1) and thyminol (2) were isolated fromSpatoglossum variabileand colonialZoanthid, respectively. Three known compounds, 2-deoxyinosine (3), 2-deoxythymidine (4) and hexadecylhexadecanoate (5) were also isolated for the first time from the methanolic extract of the colonialZoanthid.

ISSN:1057-5634    

DOI:10.1080/10575639908048795

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Coronamic acid and norcoronamic acid have been prepared in racemic form in 11% and 20% overall yields, respectively, from (E)- methanohomoserine, while the (1S,2R)-isomer of the latter allows the preparation of enantiomerically pure (1S,2R)- allocoronamic acid in 37% overall yield. Care is required to avoid intramolecular cyclisation reactions during side chain manipulation.

ISSN:1057-5634    

DOI:10.1080/10575639908048796

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

6-[2-(7-Methyljuglonyl)]isoxylospyrin, a 7-methyljuglone tetramer, was isolated from Diospyros chamaethamnus, and its structure elucidated by spectroscopic methods.

ISSN:1057-5634    

DOI:10.1080/10575639908048797

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Pathogenic Nocardia strains such as N. brasiliensis were found to produce nocardiolactone (I) as a dialkyl-substituted β-lactone. the chemical constitution and relative stereochemistry were settled by MS and NMR measurements.

ISSN:1057-5634    

DOI:10.1080/10575639908048798

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Three new cucurbitacins as well as thirteen known ones were isolated from the fruits of Bryonia verrucosa. the new compounds were characterized by chemical and spectral methods. an effective and simple method to isomerize 2-hydroxy-3-keto-cucurbitacins in acid media is described.

ISSN:1057-5634    

DOI:10.1080/10575639908048799

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new coumarino-lignoid, venkatasin, has been isolated from the whole plant ofJatropha gossypifolia.the structure of the compound was established from spectral and chemical evidence and finally from its synthesis by regioselective acetylation of a known coumarino-lignoid, cleomiscosin A.

ISSN:1057-5634    

DOI:10.1080/10575639908048800

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new phenalenone-type phytoanticipin 4′-dehydroxy-irenolone, has been isolated from healthy rhizomes of theMusaselected hybrid resistant cultivar SH-3481. the structure of the new substance was elucidated using spectroscopic data. the chemical shift for all the hydrogen and carbon atoms in the molecule were unambiguously established by mono and bidimensional, homo and heteronuclear NMR experiments.

ISSN:1057-5634    

DOI:10.1080/10575639908048801

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Two novel taxane diterpenoids were isolated from the seeds of the Chinese yew,Taxus mairei, and their structures were established as 2α,20-dihydroxy-9α, 10β-diacetoxy-taxa-4,11-diene-13-one (1) and 2-deacetyl taxinine (2) on the basis of spectroscopic analysis. 1 was considered as one of the important intermediates in the biogenesis of taxoids.

ISSN:1057-5634    

DOI:10.1080/10575639908048802

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor