Pub Date : 2001-11-01DOI: 10.1080/10575630108041295
Shuo Cao, K. Sim, S. Goh
Abstract Two new biflavonoids, pyranoamentoflavone 7-methyl ether (1) and pyranoamentoflavone 4′-methyl ether (2), have been isolated from the leaves of Calophyllum venulosum. The structures of these two new compounds were elucidated by spectroscopic data.
{"title":"Minor Methylated Pyranoamentoflavones from Calophyllum venulosum","authors":"Shuo Cao, K. Sim, S. Goh","doi":"10.1080/10575630108041295","DOIUrl":"https://doi.org/10.1080/10575630108041295","url":null,"abstract":"Abstract Two new biflavonoids, pyranoamentoflavone 7-methyl ether (1) and pyranoamentoflavone 4′-methyl ether (2), have been isolated from the leaves of Calophyllum venulosum. The structures of these two new compounds were elucidated by spectroscopic data.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73324993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-01DOI: 10.1080/10575630108041303
K. Krohn, U. Flörke, M. S. Rao, K. Steingröver, H. Aust, S. Draeger, B. Schulz
Abstract One known (1) and five new polyketide metabolites (2-6) were isolated from the culture extract of an endophytic fungus. Mycelia sterila, from the Canadian thistle Cirsium arvense. Compounds 1-4 are members of the isocoumarin family, whereas metabolite 5 is a dihydrobenzofuran and 6 has an open chain structure. All compounds have an unusual methyl group at the aromatic ring that does not fit into the usual polyketide pattern.
{"title":"Metabolites from Fungi 15. New Isocoumarins from an Endophytic Fungus Isolated from the Canadian Thistle Cirsium arvense","authors":"K. Krohn, U. Flörke, M. S. Rao, K. Steingröver, H. Aust, S. Draeger, B. Schulz","doi":"10.1080/10575630108041303","DOIUrl":"https://doi.org/10.1080/10575630108041303","url":null,"abstract":"Abstract One known (1) and five new polyketide metabolites (2-6) were isolated from the culture extract of an endophytic fungus. Mycelia sterila, from the Canadian thistle Cirsium arvense. Compounds 1-4 are members of the isocoumarin family, whereas metabolite 5 is a dihydrobenzofuran and 6 has an open chain structure. All compounds have an unusual methyl group at the aromatic ring that does not fit into the usual polyketide pattern.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84899667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-11-01DOI: 10.1080/10575630108041296
B. Son, Yong‐Jin Cho, J. Choi, W. Lee, Dong-Soo Kim, H. Choi, Jae-Sue Choi, Jee H Jung, K. Im, W. C. Choi
Abstract Two new galactopyranosyldiacylglycerols have been isolated from the marine baciilariophycean microalga Nizschia sp. and their structures were determined as (2S)-3-O-β-D-galactopyranosyl-1,2-di-O-(9Z-hexadecenoyl)glycerol (1) and (2S)-3-O-β-D-galactopyranosyl-1,O-(5Z, 8Z,11Z.14Z,17Z-eicosapentaenoyl)-2-O-(9Z-hexadecenoyl)glycerol (2) by physicochemical evidence.
摘要从海洋细菌藻微藻Nizschia sp.中分离得到两种新的半乳糖酰基二酰基甘油，经理化鉴定分别为(2S)-3-O-β- d -半乳糖酰基-1,2-二O-(9z -十六烯基)甘油(1)和(2S)-3-O-β- d -半乳糖酰基- 1,0 -(5Z, 8Z, 11z, 14z, 17z -二十碳五烯基)-2-O-(9z -十六烯基)甘油(2)。
{"title":"New Galactolipids from the Marine Bacillariophycean Microalga Nitzschia sp","authors":"B. Son, Yong‐Jin Cho, J. Choi, W. Lee, Dong-Soo Kim, H. Choi, Jae-Sue Choi, Jee H Jung, K. Im, W. C. Choi","doi":"10.1080/10575630108041296","DOIUrl":"https://doi.org/10.1080/10575630108041296","url":null,"abstract":"Abstract Two new galactopyranosyldiacylglycerols have been isolated from the marine baciilariophycean microalga Nizschia sp. and their structures were determined as (2S)-3-O-β-D-galactopyranosyl-1,2-di-O-(9Z-hexadecenoyl)glycerol (1) and (2S)-3-O-β-D-galactopyranosyl-1,O-(5Z, 8Z,11Z.14Z,17Z-eicosapentaenoyl)-2-O-(9Z-hexadecenoyl)glycerol (2) by physicochemical evidence.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88210454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10575630108041285
R. Jäälaid, I. Järving, T. Pehk, O. Parve, Ü. Lille
Abstract Starting from ergosterol two novel 9,11-secosterols with modified side chains (1a) and (1c) were synthesized via eight main transformations.
摘要以麦角甾醇为原料，经8次主要转化合成了具有侧链修饰的9,11-二醇(1a)和(1c)。
{"title":"Short Synthesis of Novel 9,11-Secosterols","authors":"R. Jäälaid, I. Järving, T. Pehk, O. Parve, Ü. Lille","doi":"10.1080/10575630108041285","DOIUrl":"https://doi.org/10.1080/10575630108041285","url":null,"abstract":"Abstract Starting from ergosterol two novel 9,11-secosterols with modified side chains (1a) and (1c) were synthesized via eight main transformations.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89091358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10575630108041293
D. Thangadurai, M. Viswanathan, N. Ramesh
Repeated silica gel chromatography of the dichloromethane extract of air-dried stems of Indigofera longeracemosa followed by reverse-phase HPLC separation yielded a new decahydropyridoquinoline, rel-(3S, 5R, 6S, SR, 8aR, 12aR)-8-acetoxy-6-butyl-3-isothiocyanatodecahydropyrido (2,1) quinoline.
{"title":"Characterization of a New Decahydropyridoquinoline from Indigofera longeracemosa Boiv. Ex Baill. (Fabaceae)","authors":"D. Thangadurai, M. Viswanathan, N. Ramesh","doi":"10.1080/10575630108041293","DOIUrl":"https://doi.org/10.1080/10575630108041293","url":null,"abstract":"Repeated silica gel chromatography of the dichloromethane extract of air-dried stems of Indigofera longeracemosa followed by reverse-phase HPLC separation yielded a new decahydropyridoquinoline, rel-(3S, 5R, 6S, SR, 8aR, 12aR)-8-acetoxy-6-butyl-3-isothiocyanatodecahydropyrido (2,1) quinoline.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85049110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10575630108041282
Abstract This is a scanned image of the original Editorial Board page(s) for this issue.
这是本刊编辑委员会原始页面的扫描图像。
{"title":"Editorial board page for “Natural Product Letters”, Volume 15, Number 4","authors":"","doi":"10.1080/10575630108041282","DOIUrl":"https://doi.org/10.1080/10575630108041282","url":null,"abstract":"Abstract This is a scanned image of the original Editorial Board page(s) for this issue.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73036284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10575630108041288
V. R. Galindo, N. Waksman
Abstract Peroxisomicines A1 (1) and A2 (2) are cytotoxic hydroxyanthracenones isolated from the fruits of Karwinskia parvifolia. Peroxisomicine A1 exhibits selective cytotoxicity against several tumor cell lines. In the present investigation three minor constituents were obtained from the same fruit extracts; peroxisomicine A3 (3) and isoperoxisomicines A1 (4) and A2 (5). Compounds 3and 5 are novel and their structures were determined by spectroscopic methods and molecular modeling. Compounds 1-5 were significantly cytotoxic against hepatoma cell lines.
{"title":"Cytotoxic Hydroxyanthracenones from Fruits of Karwinskia Parvifolia","authors":"V. R. Galindo, N. Waksman","doi":"10.1080/10575630108041288","DOIUrl":"https://doi.org/10.1080/10575630108041288","url":null,"abstract":"Abstract Peroxisomicines A1 (1) and A2 (2) are cytotoxic hydroxyanthracenones isolated from the fruits of Karwinskia parvifolia. Peroxisomicine A1 exhibits selective cytotoxicity against several tumor cell lines. In the present investigation three minor constituents were obtained from the same fruit extracts; peroxisomicine A3 (3) and isoperoxisomicines A1 (4) and A2 (5). Compounds 3and 5 are novel and their structures were determined by spectroscopic methods and molecular modeling. Compounds 1-5 were significantly cytotoxic against hepatoma cell lines.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78768757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10575630108041290
Francisca N. Melo, V. Navarro, M. S. Silva, Emidio V. Leitão da‐Cunha, J. Barbosa-Filho, R. Braz-Filho
Abstract From the stem bark of Bowdichia virgilioides, lupeol, lupeol acetate, sitosterol, stigmasterol and methyl-3-[2-(1-hydroxymethylvinyl)2,3-dihydrobenzo[b]furan-5-yl]-(E)-2-propenoate have been isolated. The latter is a new compound and it has been named as bowdenol. Their structures were elucidated with the aid of spectroscopic techniques, mostly 1 and 2D NMR. The biogenetic pathway for bowdenol has been suggested.
{"title":"Bowdenol, a New 2,3-Dihydrobenzofuran Constituent from Bowdichia Virgilioides","authors":"Francisca N. Melo, V. Navarro, M. S. Silva, Emidio V. Leitão da‐Cunha, J. Barbosa-Filho, R. Braz-Filho","doi":"10.1080/10575630108041290","DOIUrl":"https://doi.org/10.1080/10575630108041290","url":null,"abstract":"Abstract From the stem bark of Bowdichia virgilioides, lupeol, lupeol acetate, sitosterol, stigmasterol and methyl-3-[2-(1-hydroxymethylvinyl)2,3-dihydrobenzo[b]furan-5-yl]-(E)-2-propenoate have been isolated. The latter is a new compound and it has been named as bowdenol. Their structures were elucidated with the aid of spectroscopic techniques, mostly 1 and 2D NMR. The biogenetic pathway for bowdenol has been suggested.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72812344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10575630108041287
A. Pearce, Russell C. Babcock, G. Lambert, B. Copp
Abstract From the New Zealand ascidian, Lissoclinum notti a new natural product, N2,N2 , 7-trimethyl-guanine (1) has been isolated. The structure of 1 was elucidated by analysis of spectroscopic data.
{"title":"N2,N2 , 7-Trimethylguanine, a New Trimethylated Guanine Natural Product from the New Zealand Ascidian, Lissoclinum Notti","authors":"A. Pearce, Russell C. Babcock, G. Lambert, B. Copp","doi":"10.1080/10575630108041287","DOIUrl":"https://doi.org/10.1080/10575630108041287","url":null,"abstract":"Abstract From the New Zealand ascidian, Lissoclinum notti a new natural product, N2,N2 , 7-trimethyl-guanine (1) has been isolated. The structure of 1 was elucidated by analysis of spectroscopic data.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79221443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10575630108041292
J. Kubanek, W. Fenical, J. Pawlik
Abstract Two groups of antifeedant triterpene glycosides were identified from the Caribbean sponge Erylus formosus. The structure of formoside B, a novel N-acetyl amino derivative of the known penasterol tetrasaccharide formoside, was elucidated using NMR and mass spectral data. Four triterpene hexasaccharides and two triterpene trisaccharides, characterized by a 31-carbon aglycone, proved difficult to isolate and therefore only the structure of their aglycone was determined. Gas chromatographic analysis of derivatized saccharides from these mixtures established the carbohydrate content of these compounds. All of the triterpene glycosides isolated contributed to the chemical defenses of this sponge, although with differing activities.
{"title":"New Antifeedant Triterpene Glycosides from the Caribbean Sponge Erylus Formosus","authors":"J. Kubanek, W. Fenical, J. Pawlik","doi":"10.1080/10575630108041292","DOIUrl":"https://doi.org/10.1080/10575630108041292","url":null,"abstract":"Abstract Two groups of antifeedant triterpene glycosides were identified from the Caribbean sponge Erylus formosus. The structure of formoside B, a novel N-acetyl amino derivative of the known penasterol tetrasaccharide formoside, was elucidated using NMR and mass spectral data. Four triterpene hexasaccharides and two triterpene trisaccharides, characterized by a 31-carbon aglycone, proved difficult to isolate and therefore only the structure of their aglycone was determined. Gas chromatographic analysis of derivatized saccharides from these mixtures established the carbohydrate content of these compounds. All of the triterpene glycosides isolated contributed to the chemical defenses of this sponge, although with differing activities.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88279835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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