{"title":"Cis-bullatencin, a linear acetogenin from roots of Uvaria chamae.","authors":"Djibril Fall, Christophe Gleye, Xavier Franck, Alain Laurens, Reynald Hocquemiller","doi":"10.1080/10575630290026437","DOIUrl":"https://doi.org/10.1080/10575630290026437","url":null,"abstract":"<p><p>A novel acetogenin, cis-bullatencin, was isolated by successive chromatography of a cyclohexane extract of Uvaria chamae P. Beauv. roots. The structure was elucidated by a combination of chemical and spectroscopic methods (NMR, MS). Eight known mono-THF acetogenins--bullatencin, annotemoyin-1, solamin, uvariamicin-I, -II, -III, cis-reticulatacin and cis-uvariamicin-I--were also obtained.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290026437","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22114159","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}
P T Deota, P R Upadhyay, K B Patel, K J Mehta, A K Varshney, M H Mehta
{"title":"Effect of some ultraviolet light absorbers on photo-stabilization of azadirachtin-A.","authors":"P T Deota, P R Upadhyay, K B Patel, K J Mehta, A K Varshney, M H Mehta","doi":"10.1080/10575630290031981","DOIUrl":"https://doi.org/10.1080/10575630290031981","url":null,"abstract":"<p><p>The effect of photo-stabilization of Azadirachtin-A (Aza-A) was examined when exposed to sunlight and ultraviolet light in the presence of four structurally different ultraviolet stabilizers namely 4-aminobenzoic acid, 2,4-dihydroxybenzophenone, 4,4'-dihydroxybenzophenone and phenyl salicylate. The percentages of Aza-A recovered at different time intervals from slides exposed to different light conditions with and without UV stabilizers as well as kinetic studies indicated that the addition of phenyl salicylate in methanolic solution of Aza-A (in 1:1 mole ratio) provides the best photo-stabilization of Aza-A molecule among the four UV stabilizers studied.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290031981","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22114161","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}
K Simin, Zulfiqar Ali, Syed Muhammad Khaliq-Uz-Zaman, Viqar Uddin Ahmad
{"title":"Structure and biological activity of a new rotenoid from Pongamia pinnata.","authors":"K Simin, Zulfiqar Ali, Syed Muhammad Khaliq-Uz-Zaman, Viqar Uddin Ahmad","doi":"10.1080/10575630290033114","DOIUrl":"https://doi.org/10.1080/10575630290033114","url":null,"abstract":"<p><p>Pongarotene (1), a new rotenoid and karanjin (2), a known flavonol, were isolated from the seeds of Pongamia pinnata. The structure determination of these compounds were based on spectral analyses including 2D-NMR. The antifungal, antibacterial and phytotoxicity results of pure compounds 1 and 2 as well as of the methanol (M) and ethyl acetate (E) crude extracts are also being reported.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290033114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22115308","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}
{"title":"Methyl gardenolate A, a novel cycloartenoid ester from the leaves of Combretum woodii (Combretaceae).","authors":"Philip H Coombes, Colin B Rogers","doi":"10.1080/10575630290020587","DOIUrl":"https://doi.org/10.1080/10575630290020587","url":null,"abstract":"<p><p>Isolation of the novel cycloartenoid ester methyl gardenolate A (3a), together with gardenolic acid A (2a) and the unusual triterpenoid xi-glutinol (D:B-friedoolean-5-en-3xi-ol) (1a) from the leaves of Combretum woodii support its differentiation from the closely related C. krausii.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290020587","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22114157","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}
Clarisa E Vaccarini, Sara M Palacios, Karina M Meragelman, Virginia E Sosa
{"title":"Antifeedant activity of metabolites from Viguiera tucumanensis.","authors":"Clarisa E Vaccarini, Sara M Palacios, Karina M Meragelman, Virginia E Sosa","doi":"10.1080/10575630290030711","DOIUrl":"https://doi.org/10.1080/10575630290030711","url":null,"abstract":"<p><p>Several terpenoids and clerod-14-ene-3alpha, 4beta,13xi-triol (1), the main compound of V. tucumanensis, were isolated and bioassayed. The clerodane 1 showed higher antifeedant activity than other related compounds. Structure-activity relationships are also discussed.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290030711","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22114160","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}
{"title":"Antimicrobial triterpenes from Debregeasia salicifolia.","authors":"Erum Akbar, Abdul Malik","doi":"10.1080/10575630290033088","DOIUrl":"https://doi.org/10.1080/10575630290033088","url":null,"abstract":"<p><p>New triterpene, 3beta-(trans-cinnamoyloxy)-19alpha-hydroxy-urs-12-ene (1) has been isolated from the methanolic fraction of Debregeasia salicifolia, along with uvaol (2), 3beta,19alpha-dihydroxy-urs-12-ene (3), ursolic acid (4), pomolic acid (5), pomolic acid methyl ester (6) and tormentic acid (7) reported for the first time from this species. The compounds (1), (3) and (6) showed significant antimicrobial activity. The structure elucidation was made with the help of extensive 2D NMR spectroscopic techniques.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290033088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22115306","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}
Atta-Ur-Rahman, Nighat Sultana, M Riaz Khan, M Iqbal Choudhary
{"title":"Triterpene and coumarins from Skimmia laureola.","authors":"Atta-Ur-Rahman, Nighat Sultana, M Riaz Khan, M Iqbal Choudhary","doi":"10.1080/10575630290020613","DOIUrl":"https://doi.org/10.1080/10575630290020613","url":null,"abstract":"<p><p>In the course of our studies on the chemical constituents of the leaves of Skimmia laureola, a new triterpene O-methyl cyclolaudenol (1) and a new coumarin, (+)-7-methoxy-6-(2'R-methoxy-3'-hydroxy-3'-methyl butyl) coumarin (2) were isolated. In addition five known coumarins, isogospherol (3), heraclenol (4), 5,8-dimethoxy coumarin-2H-1-benzopyran-2-one (5), 7-methoxy-6[2'-oxo-3'-methyl butyl] coumarin (6), and (+)-ulopterol (7) were also isolated for the first time from this plant. The structures were identified by spectroscopic studies and the stereochemistry at C-2' in compounds 3 and 4 were established by Horeau's procedure.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290020613","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22114158","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}
S Ghulam Musharraf, Atta-Ur-Rahman, M Iqbal Choudhary, Sadia Sultan
{"title":"Microbial transformation of (+)-adrenosterone.","authors":"S Ghulam Musharraf, Atta-Ur-Rahman, M Iqbal Choudhary, Sadia Sultan","doi":"10.1080/10575630290033105","DOIUrl":"https://doi.org/10.1080/10575630290033105","url":null,"abstract":"<p><p>The microbial transformation of (+)-adrenosterone (1) by Cephalosporium aphidicola afforded three metabolites identified as androsta-1,4-diene-3,11,17-trione (2), 17beta-hydroxyandrost-4-ene-3,11-dione (3) and 17beta-hydroxyandrosta-1,4-diene-3,11-dione (4). The fermentation of 1 with Fusarium lini also produced metabolites 2 and 4, while the fermentation with Trichothecium roseum afforded metabolite 3. The structures of transformed products were determined by spectroscopic methods.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290033105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22115307","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}
Farooq Biabani, Sanjay K Singh, S Kumar, Kanwal Raj, A Pathak
{"title":"The Willgerodt-Kindler reaction on lupenone: unusual oxidative dimerization.","authors":"Farooq Biabani, Sanjay K Singh, S Kumar, Kanwal Raj, A Pathak","doi":"10.1080/10575630290020514","DOIUrl":"https://doi.org/10.1080/10575630290020514","url":null,"abstract":"<p><p>In continuation of our interest in chemical modification of triterpenoids, the Willgerodt-Kindler reaction of a lupane type triterpenoid lupenone provided a novel dimerized product 2. Formation of 2 is associated with an unusual oxidative dimerization of lupenone under Willgerodt-Kindler reaction conditions. The structure 2 was confirmed by extensive analysis of spectroscopic data including ES-MS and 2D-NMR.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290020514","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22114156","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}
Csilla Páska, Gabbriella Innocenti, Mariagrazia Ferlin, Mónika Kunvári, Miklós László
{"title":"Pinoresinol from Ipomoea cairica cell cultures.","authors":"Csilla Páska, Gabbriella Innocenti, Mariagrazia Ferlin, Mónika Kunvári, Miklós László","doi":"10.1080/1057530290033123","DOIUrl":"https://doi.org/10.1080/1057530290033123","url":null,"abstract":"<p><p>Ipomoea cairica cell cultures produced a tetrahydrofuran lignan, (+)-pinoresinol, identified by UV, IR, MS and NMR methods, not yet found in the intact plant, and new in the Convolvulaceae family. Pinoresinol was found to have antioxidant and Ca2+ antagonist properties. As it could be requested for its biological activity, we examined the possibility to raise the pinoresinol yield of I. cairica cultures, as well as we continued investigations on lignans' response to optimization.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/1057530290033123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22115309","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}