摘要:

Sarcococca saligna(Buxaceae) has yielded three new steroidal amines.E-salignone (1),Z-salignone (2) andNa-demethylsaracodine (3). The proposed structures of these alkamines are based on spectroscopic studies.

ISSN:1057-5634    

DOI:10.1080/10575639808041202

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A new indole monoterpene alkaloid, named capitelline (1), was isolated fromHedyotis capitellata(Rubiaceae). Its structure was elucidated by spectroscopic data (1H- and13C-NMR, MS, IR, UV).

ISSN:1057-5634    

DOI:10.1080/10575639808041203

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

(R)-(−)-1-Benzyloxycarbonyl-2-(4-methoxyphenyl)methyl-3-pyrroline (16) was prepared from (S)-malic acid. The key steps involved a highly regio andtransstereoselective reductive alkylation of N-benzylmalimide (4). This constitutes a formal asymmetric synthesis of natural (-)-anisomycin (2).

ISSN:1057-5634    

DOI:10.1080/10575639808041204

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Radio-active azadirachtin, nimbin and salanin have been produced using14C mevalonate and acetate as precursors underin vivo /in vitroconditions in the seed kernels ofAzadirachta indica.

ISSN:1057-5634    

DOI:10.1080/10575639808041205

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Two new triterpenoidal alkaloids, (+)-Na,Nb-dimethylbuxupapine (1) (20S)-3β-dimethylamino-20-dimethylamino-9,10-seco-buxa-9(11),1(10)-dienel, and (+)-16a-hydroxypapillamidine (2) {(20S)-16α-hydroxy-3β-methyl-acetylamino-20-methylamino-9,10-seco-buxa-9(11),10(19)-diene} were isolated from the methanolic extract of the leaves ofBuxus papillosa.The structures of these compounds were elucidated with the help of extensive spectroscopic studies. The structure of compound1was further confirmed by single crystal X-ray diffraction technique.

ISSN:1057-5634    

DOI:10.1080/10575639808041206

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The new 11α-O-β-D-glucopyranosylrotenoid (1) has been isolated from the seeds of a specimen ofClitoria fairchildiana.The structure was established from spectrometric data, including 2D NMR experiments.

ISSN:1057-5634    

DOI:10.1080/10575639808041207

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The mediterranean tunicateAplydium sp.contains a new hydroxydiprenylhydroquinone1together with the known compound 2-[(2′E,6′E)-3′7′-dimethylocta-2′6′-dienyl]benzene-1,4-diol (2). The structure of1was elucidated by interpretation of spectral data. Both compounds showed significant cytotoxicity against four tumor cell lines, in particular, against P-388 mouse lymphoma suspension culture.

ISSN:1057-5634    

DOI:10.1080/10575639808041208

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Two new alkaloids, kopsifine and rhazinicine, which are oxo-derivatives of kopsine and rhazinilam respectively, were obtained from the stem extract ofKopsia dasyrachisand their structures were established by spectral methods.

ISSN:1057-5634    

DOI:10.1080/10575639808041209

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

From the aerial parts ofBosistoa selwynii(Rutaceae) four novel prenylated acetophenones were isolated and identified as pyranoselwynone (5-hydroxy-6-acetyl-{6,6-dimethyl-5ξ-hydroxy-4,5-di-hydropyrano}-[3,2-h]-2,2-dimethylbenzopyran), selwynone (5,7-dihydroxy-6-acetyl-8-(3-methylbut-2-enyl)-3,4-dihydro-2,2-dimethyl-3ξ-hydroxypyran), furanoselwynone (5-hydroxy-6-acetyl-{5-[1-hydroxy-1-methylethyl]-4,5-dihydro-furano}-[3,2-h]-2,2-dimethylpyran), and isofurano-selwynone (7-hydroxy-8-acetyl-{5-[1-hydroxy-1-methylethyl]-4,5-dihydrofurano}-[3,2-f]-2,2-dimethylpyran). Other compounds isolated were a series of eight acridone alkaloids (reported on previously), the coumarins scopoletin and braylin and the triterpenes lupeol and β-amyrin. The structures of the new acetophenones were elucidated on the basis of NMR spectral data.

ISSN:1057-5634    

DOI:10.1080/10575639808041210

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Starting with 12-acetoxy-7,9(11)-drimadiene, prepared from methyl zamoranate, a majorHalimium viscosumcomponent, pereniporin A, 9-epi-warburganal and a precursor of C-9 nitrogenated drimanes were synthesized.

ISSN:1057-5634    

DOI:10.1080/10575639808041211

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor