摘要:

The stereochemistries of two new compounds isolated from the self-pollinated oils ofMentha rotundifoliawere elucidated to be (1S:2S:3R:4R)-(-)-1,2-epoxyisomenthyl acetate and (1S:2S:3S:4R)-(-)-1,2-epoxyneoisomenthyl acetate.

ISSN:1057-5634    

DOI:10.1080/10575639808044941

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A convenient, reliable reversed phase high performance liquid chromatographic (HPLC) method, which can be used for both analytical and preparative scale purification, is described for the identification and determination of the three closely-related and difficult to isolate forms of spiramycin.

ISSN:1057-5634    

DOI:10.1080/10575639808044942

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The antibacterial activity of seven labdane-type diterpenes is reported. Five were isolated from the resin of the plantCistus creticus, from which 13(E)-labd-13-ene, 8α-ol-15-yl malonic acid(5)1is a new natural product, while the two others were hemisynthetic derivatives.

ISSN:1057-5634    

DOI:10.1080/10575639808044943

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A new tetranortriterpenoid nimbinolide [2], and the known biologically active compound isonimbinolide [3] have been obtained from photo-oxidation of nimbin [1]. The structures of compounds 2 and 3 were established by spectral methods and by comparision with isonimbinolide.

ISSN:1057-5634    

DOI:10.1080/10575639808044944

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

5-(3-Hydroxyphenyl)pentanoic acid(1)and 5-(3-methoxyphenyl)pentanoic acid(2)were isolated from the roots ofAthyrium yokoscenseas natural products. The biosynthetic pathway of1and2can be explained in terms of directm-hydroxylation of benzoic acid.

ISSN:1057-5634    

DOI:10.1080/10575639808044945

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The first and concise syntheses of ardisinol II by two routes in excellent yields, are described.

ISSN:1057-5634    

DOI:10.1080/10575639808044946

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Various compounds commonly found in plants have been screened using the λ-prophage induction assay. Certain polyphenolics have been found to directly interfere with the assay providing false positive results. Although the λ-prophage induction assay provides a useful prescreen for crude plant extracts, we have found that when employing this bioassay with plant extracts rich in certain compounds, a negative control assay should be employed.

ISSN:1057-5634    

DOI:10.1080/10575639808044947

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Feeding studies of [1,2-13C2]acetate to cell cultures ofCatharanthus roseusrevealed that the pro-Sand pro-Rmethyl groups on C-25 of isofucosterol originate from C-2 and C-6 of mevalonate, respectively.

ISSN:1057-5634    

DOI:10.1080/10575639808044948

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A novel phenylglycoside has been isolated from the aqueous extract of leaves fromEugenia lambertiana.

ISSN:1057-5634    

DOI:10.1080/10575639808044949

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Three known alkaloids: lochnericine, 21-hydroxycyclolochnerine, and 19(S)-epimisiline (1), were isolated from hairy root cultures ofCatharanthus roseus.Their identification was carried out by analysis of their spectroscopic data. This is the first report of 19(S)-epimisiline as being produced by hairy root cultures of C.roseus.

ISSN:1057-5634    

DOI:10.1080/10575639808044950

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor