摘要:

Four novel annonaceous acetogenins, montanacins B-E(1-4) were isolated fromAnnona montana(Annonaceae). Montanacins D and E contain a tetrahydropyran ring along with a nonadjacent tetrahydrofuran ring, belonging to the most unusual type of acetogenins discovered so far.

ISSN:1057-5634    

DOI:10.1080/10575639908041214

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new xanthone (1) was isolated together with nine known xanthones (2-10,12) and a known benzofuran (11) from the stems ofGarcinia kolaHeckel (Guttiferae) collected in Nigeria and their structures were characterized on the basis of spectroscopic and chemical evidence.

ISSN:1057-5634    

DOI:10.1080/10575639908041215

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The iridoid 2′-coumaroyl mussaenosidic acid, isolated fromAvicennia germinans(Avicenniaceae), was analysed by NMR and molecular modeling: two isomeric forms were confirmed. In addition, the known compound1(6S, 9R) roseoside was isolated for the first time from this species ofAvicennia.

ISSN:1057-5634    

DOI:10.1080/10575639908041216

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new monogalactosyl triacylglycerol has been isolated from the artificial cultures of the dinoflagellateAmphidinium sp.Its structure was determined through the interpretation of 2D-NMR spectral data and chemical degradation. The relative steieochemistry is proposed on the basis of ROESY data.

ISSN:1057-5634    

DOI:10.1080/10575639908041217

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

From the bulbs ofPolianthes tuberosaLinn., a novel steroidal saponin has been isolated. The molecular structure has been elucidated by extensive spectroscopic means and chemical reactions. The compounds has been identified as 2β,3β,16β,22β tetrahydroxycholesta-5-ene 16-O-β-D-apiofuranoside.

ISSN:1057-5634    

DOI:10.1080/10575639908041218

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Two new and six knownent-kaurene diterpenes were isolated from the whole plant ofSideritis athoaand their structures were elucidated asent-3α, 18-dihydroxykaur-16-ene (1), athonolone (2), ent-3β-hydroxykaur-16-ene (3)ent-3β,7α-dihydroxykaur-16-ene (4), 7-epicandicandiol (5), linearol (6), foliol (7) and sidol (8) based on 1D and 2D NMR techniques and HRMS.

ISSN:1057-5634    

DOI:10.1080/10575639908041219

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A novel steroid 23-ethyl, 24-methyl, 27-nor cholesta-5, 25-dien-3β, 23-diol (1) and two known bromopolyacetalenes xestospongicacid methylester (2), its stereoisomer3have been isolated and characterized by the study of spectral data.

ISSN:1057-5634    

DOI:10.1080/10575639908041220

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Chemical investigation on the stems ofNothapodytes foetidahas resulted in the isolation of 9-methoxy-20-(S)-mappicine, a new minor constituent along with seven other known alkaloids. The structure of the new compound was established from spectral and chemical evidences. An efficient chemoenzymatic synthesis of the compound starting from 9-methoxycamptothecin, a known constituent of the plant, has been achieved.

ISSN:1057-5634    

DOI:10.1080/10575639908041221

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new diarylnonanoid isolated fromMyristica ceylanicawas established as demethyldactyloidin by spectroscopic evidence and its chemical conversions to methyldactyloidin and diacetyldemethyldactyloidin. Three other diarylnonanoids, an arylalkanone, two lignans and isoflavone which are new to the species were also isolated from the same extract. Structures of these compounds were identified by comparison of the spectral data with previously reported compounds from other Myristicaceae species.

ISSN:1057-5634    

DOI:10.1080/10575639908041222

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:10.1080/10575639908041223

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor