摘要:

Chemical investigation of the seeds of Cassia grandis yielded three new anthraquinone glucosides, 1,2,4,8 - tetrahydroxy-6-methoxy-3 methyl anthraquinone - 2 - O -β - D - glucopyranoside, 3 - hydroxy-6, 8-dimethoxy-2- methyl anthraquinone - 3 - O-β -D -glucopyranoside and 1, 3- dihydroxy-6, 7, 8-trimethoxy anthraquinone-3 - O - β - D -glucopyranoside. The structures of these glucosides were elucidated by a combination of chemical and spectroscopic methods and finally by their syntheses.

ISSN:1057-5634    

DOI:10.1080/10575639308043790

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The one-step regioselective construction of the steroid skeleton by high pressure EtAlCl2catalyzed Diels-Alder reaction of 3-methyl-2-cyclopenten-1-one with a 1-ethenyl-hexahydronaphthalene is described. Structure analysis of the reaction products by NMR spectroscopy is presented.

ISSN:1057-5634    

DOI:10.1080/10575639308043791

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Caratuberoside C & D, two new pregnane glycosides, have been isolated fromCaralluma tuberculataN. E. Brown and their structures were elucidated on the basis of spectroscopic evidences, chemical correlation with nona-acetyl caratuberoside C & D and chemical degradation.

ISSN:1057-5634    

DOI:10.1080/10575639308043792

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

A new isoquinoline alkaloid, haiderine (1), was isolated from aerial parts ofCocculus hirsutustogether with eleven known alkaloids. The structure of (1), was determined by spectroscopic methods and by chemical transformations.

ISSN:1057-5634    

DOI:10.1080/10575639308043793

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

A novel natural E-prostaglandin - 1a-1b-dihomo-2,3 didehydro-PGE2(1) was isolated from ram seminal vesicles and its structure was elucidated by MS and NMR analysis.

ISSN:1057-5634    

DOI:10.1080/10575639308043794

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The ergostanoid lactones, perulactone 3-O-β-D-glucopyranoside (1) and isoperulactone 3-O-β-D-glucopyranoside (2) were isolated from leaves ofPhysalis peruviana. Compound1reduces the growth ofHelicoverpa zealarvae to 50% of control size at a dietary concentration of 150 mg kg−1

ISSN:1057-5634    

DOI:10.1080/10575639308043795

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Culture filtrates, their extracts and mycelium extracts of actinomycetes strains are analyzed by HPLC and diode-array detection. Comparing retention times and UV-visible spectra with data from known antibiotics and other metabolites stored in natural substance class libraries in a data base permit an effective screening for new secondary metabolites.

ISSN:1057-5634    

DOI:10.1080/10575639308043796

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Starting from (-)-carvone, two consecutive regio- and stereospecific alkylations followed by a stereoselective INOC reaction, carried out either on a nitro derivative or on the corresponding oxime, afford, in few overall steps, a monochiral bicyclic synthon which may be used for the preparation of terpenes such as aphidicolin.

ISSN:1057-5634    

DOI:10.1080/10575639308043797

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Reaction of 2,3,4,6-tetra-O-benzylglucopyranose with tris (dimethylamino)phosphine and carbon tetrachloride in dichloromethane has generated glucopyranosyl chlorideviatris(dimethylamino)alkoxyphosphonium chloride, which effectively reactsin situwith hydroxyl compounds to form glucosides in the presence of silver triflate or trimethylsilyl triflate.

ISSN:1057-5634    

DOI:10.1080/10575639308043798

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The new cordiachromes 1 and 2, named oncocalyxones A and B, have been Isolated from the wood ofAuxemma oncocalyx. Their structures were deduced from spectroscopic data, Including 2D NMR experiments, and chemical transformations.

ISSN:1057-5634    

DOI:10.1080/10575639308043799

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor