Pub Date : 2002-10-01DOI: 10.1080/10575630290033079
Stefan Opitz, Felipe Otálvaro, Fernando Echeverri, Winston Quiñones, Bernd Schneider
Two new oxabenzochrysenones (naphthoxanthenones), representing phenylphenalenone-related natural products, were isolated from Musa acuminata and Wachendorfia thyrsiflora.
{"title":"Isomeric oxabenzochrysenones from Musa acuminata and Wachendorfia thyrsiflora.","authors":"Stefan Opitz, Felipe Otálvaro, Fernando Echeverri, Winston Quiñones, Bernd Schneider","doi":"10.1080/10575630290033079","DOIUrl":"https://doi.org/10.1080/10575630290033079","url":null,"abstract":"<p><p>Two new oxabenzochrysenones (naphthoxanthenones), representing phenylphenalenone-related natural products, were isolated from Musa acuminata and Wachendorfia thyrsiflora.</p>","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"16 5","pages":"335-8"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10575630290033079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22115305","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 : 2002-01-01DOI: 10.1080/10575630290019967
S. Estrada, L. Acevedo, Mitzi Rodriguez, R. Toscano, R. Mata
Two new triterpenoids, nidemin ( 1 ), a modified lanostane, and 9,19-cyclolanosta-24,24-dimethyl-25-en-3 -yl trans - p -hydroxycinnamate ( 2 ) have been isolated from the orchids Nidema boothii and Scaphyglottis livida , respectively. The isolates were characterized by spectral methods. The structure of nidemin ( 1 ) was unambiguously confirmed by X-ray analysis.
从兰科植物Nidema boothii和Scaphyglottis livida中分别分离到两个新的三萜:nidemin(1)、一个修饰的lanostane和9,19- cycloolanosta -24,24-dimethyl-25-en-3 -yl trans - p -hydroxycinnamate(2)。用波谱法对分离物进行了鉴定。x射线分析明确证实了nidemin(1)的结构。
{"title":"New Triterpenoids from the Orchids Scaphyglottis Livida and Nidema Boothii","authors":"S. Estrada, L. Acevedo, Mitzi Rodriguez, R. Toscano, R. Mata","doi":"10.1080/10575630290019967","DOIUrl":"https://doi.org/10.1080/10575630290019967","url":null,"abstract":"Two new triterpenoids, nidemin ( 1 ), a modified lanostane, and 9,19-cyclolanosta-24,24-dimethyl-25-en-3 -yl trans - p -hydroxycinnamate ( 2 ) have been isolated from the orchids Nidema boothii and Scaphyglottis livida , respectively. The isolates were characterized by spectral methods. The structure of nidemin ( 1 ) was unambiguously confirmed by X-ray analysis.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"23 1","pages":"81 - 86"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73757128","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 : 2002-01-01DOI: 10.1080/1057563029001/4809
T. Tamura, Atsushi Kataoka, Lidan Shu, Akihiko Ashida, Hidehiko Tanaka, K. Inagaki
A specific inhibitor of DNA cytosine C5-methylases would be useful for studying genomic imprinting, X-chromosome inactivation, carcinogenesis, and regulation of tissue-specific gene expression, for these physiological phenomena appears to be regulated through DNA methylation in promoter sequences. This paper reports a novel convenient in vitro assay method for screening DNA cytosine C5-methylase inhibitor. Our method uses a commercially available Hae III methylase (cytosine C5 methylase), its corresponding Hae III endonuclease, and u DNA as their substrate.
{"title":"An in vitro screening method for DNA cytosine-C5-methylase inhibitor","authors":"T. Tamura, Atsushi Kataoka, Lidan Shu, Akihiko Ashida, Hidehiko Tanaka, K. Inagaki","doi":"10.1080/1057563029001/4809","DOIUrl":"https://doi.org/10.1080/1057563029001/4809","url":null,"abstract":"A specific inhibitor of DNA cytosine C5-methylases would be useful for studying genomic imprinting, X-chromosome inactivation, carcinogenesis, and regulation of tissue-specific gene expression, for these physiological phenomena appears to be regulated through DNA methylation in promoter sequences. This paper reports a novel convenient in vitro assay method for screening DNA cytosine C5-methylase inhibitor. Our method uses a commercially available Hae III methylase (cytosine C5 methylase), its corresponding Hae III endonuclease, and u DNA as their substrate.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"606 1","pages":"25 - 27"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77468957","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 : 2002-01-01DOI: 10.1080/10575630290004242
M. So, W. Chan, P. Xia, Yu-xin Cui
From the 95% ethanol extract of the Hong Kong liverwort, Marchantia paleacea , guided by bioactivity directed isolation, two novel isoriccardinquinones A and B were obtained together with previously known marchantin C, isoriccardin C and phenanthrene derivative, 2-hydroxy-3,7-dimethoxyphenanthrene. The structures of the new compounds were established by high field spectroscopic methods, including 2D NMR techniques.
{"title":"Two New Cyclic Bis(Bibenzyl)s, Isoriccardinquinone A and B from the Liverwort Marchantia Paleacea","authors":"M. So, W. Chan, P. Xia, Yu-xin Cui","doi":"10.1080/10575630290004242","DOIUrl":"https://doi.org/10.1080/10575630290004242","url":null,"abstract":"From the 95% ethanol extract of the Hong Kong liverwort, Marchantia paleacea , guided by bioactivity directed isolation, two novel isoriccardinquinones A and B were obtained together with previously known marchantin C, isoriccardin C and phenanthrene derivative, 2-hydroxy-3,7-dimethoxyphenanthrene. The structures of the new compounds were established by high field spectroscopic methods, including 2D NMR techniques.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"192 1","pages":"167 - 171"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78031050","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 : 2002-01-01DOI: 10.1080/1057563029001/4881
Christopher Jenks
The root bark of Tabernanthe iboga contains ibogaine as its predominant alkaloid and has been an important source of it. Ibogaine is used experimentally to interrupt drug addiction and allow therapeutic intervention, but is currently unaffordable to doctors in less economically developed countries. To meet this need, an extraction of alkaloids from T. iboga root bark was optimized and simplified to use only diluted vinegar and ammonia, and was successfully applied to related alkaloids from Voacanga africana bark also. The alkaloids were converted to their hydrochlorides and purified, and the minor alkaloids were recovered.
{"title":"Extraction Studies of Tabernanthe Iboga and Voacanga Africana","authors":"Christopher Jenks","doi":"10.1080/1057563029001/4881","DOIUrl":"https://doi.org/10.1080/1057563029001/4881","url":null,"abstract":"The root bark of Tabernanthe iboga contains ibogaine as its predominant alkaloid and has been an important source of it. Ibogaine is used experimentally to interrupt drug addiction and allow therapeutic intervention, but is currently unaffordable to doctors in less economically developed countries. To meet this need, an extraction of alkaloids from T. iboga root bark was optimized and simplified to use only diluted vinegar and ammonia, and was successfully applied to related alkaloids from Voacanga africana bark also. The alkaloids were converted to their hydrochlorides and purified, and the minor alkaloids were recovered.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"27 15 1","pages":"71 - 76"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78645750","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 : 2002-01-01DOI: 10.1080/10575630290013576
S. Sahpaz, T. Hennebelle, F. Bailleul
A new phenylethanoid glycoside, marruboside, has been isolated from the aerial parts of Marrubium vulgare L. Its structure was established as 3,4-dihydroxy- g -phenylethoxy- O- [ g - d -apiofuranosyl-(1 M 2)- f - l -rhamnopyranosyl-(1 M 3)]-[ g - d -apiofuranosyl-(1 M 6)]-4- O -caffeoyl- g - d -glucopyranoside, on the basis of spectroscopic evidence.
{"title":"Marruboside, a New Phenylethanoid Glycoside from Marrubium Vulgare L","authors":"S. Sahpaz, T. Hennebelle, F. Bailleul","doi":"10.1080/10575630290013576","DOIUrl":"https://doi.org/10.1080/10575630290013576","url":null,"abstract":"A new phenylethanoid glycoside, marruboside, has been isolated from the aerial parts of Marrubium vulgare L. Its structure was established as 3,4-dihydroxy- g -phenylethoxy- O- [ g - d -apiofuranosyl-(1 M 2)- f - l -rhamnopyranosyl-(1 M 3)]-[ g - d -apiofuranosyl-(1 M 6)]-4- O -caffeoyl- g - d -glucopyranoside, on the basis of spectroscopic evidence.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"45 1","pages":"195 - 199"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87900684","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 : 2002-01-01DOI: 10.1080/10575630290020596
Nam-Cheol Kim, Darrick S. H. L. Kim, A. Kinghorn
Three new ( 1-3 ) triterpenoids and one known ( 4 ) triterpenoid were isolated from an acid hydrolyzed methanol-soluble extract of the leaves of Abrus precatorius . Their structures were identified as (20 S ,22 S )-3 g ,22-dihydroxycucurbita-5(10),24-diene-26,29-dioic acid i -lactone ( 1 ), 3- O -[6'-methyl- g - d -glucuronopyranosyl]-3 g ,22 g -dihydroxyolean-12-en-29-oic acid methyl ester ( 2 ), 3- O - g - d -glucuronopyranosylsophoradiol methyl ester ( 3 ), and sophoradiol ( 4 ) by spectroscopic techniques including 2D NMR.
从Abrus precatorius叶片的醇溶性酸水解提取物中分离到3个新的(1-3)三萜和1个已知的(4)三萜。通过二维核磁共振等波谱技术鉴定其结构为(20 S,22 S)-3 g,22-二羟基葫芦-5(10)，24-二烯-26,29-二酸i -内酯(1)，3- O -[6'-甲基-g -d -葡萄糖醛酸-葡萄糖醛酸甲酯]-3 g,22 g -二羟基烯-12-烯-29-葡萄糖醛酸甲酯(2)，3- O -g -d -葡萄糖醛酸-葡萄糖醛酸甲酯(3)和槐二醇(4)。
{"title":"New Triterpenoids from the Leaves of Abrus Precatorius","authors":"Nam-Cheol Kim, Darrick S. H. L. Kim, A. Kinghorn","doi":"10.1080/10575630290020596","DOIUrl":"https://doi.org/10.1080/10575630290020596","url":null,"abstract":"Three new ( 1-3 ) triterpenoids and one known ( 4 ) triterpenoid were isolated from an acid hydrolyzed methanol-soluble extract of the leaves of Abrus precatorius . Their structures were identified as (20 S ,22 S )-3 g ,22-dihydroxycucurbita-5(10),24-diene-26,29-dioic acid i -lactone ( 1 ), 3- O -[6'-methyl- g - d -glucuronopyranosyl]-3 g ,22 g -dihydroxyolean-12-en-29-oic acid methyl ester ( 2 ), 3- O - g - d -glucuronopyranosylsophoradiol methyl ester ( 3 ), and sophoradiol ( 4 ) by spectroscopic techniques including 2D NMR.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"3 1","pages":"261 - 266"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86392576","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 : 2002-01-01DOI: 10.1080/1057563029001/4854
Xiao Zheng, Pei‐Qiang Huang, Yuanping Ruan, A. Lee, W. Chan
Diastereoselective methylation of dimethyl (S)-malate 7, followed by two, three-step reductive de-hydroxylation procedures afforded dimethyl (R)-2-methylsuccinate 11 in 80.2% e.e. and 84.7% e.e., respectively. The latter compound was further transformed into the natural enantiomers of the ant venom alkaloids (R)-leptothoracine 1 and (R)-3-methyl-N-(2-phenylethyl)-pyrrolidine 2.
二甲基(S)-苹果酸酯7的非对映选择性甲基化，然后是两步、三步还原去羟基化过程，分别在80.2% e.e.和84.7% e.e.得到二甲基(R)-2-甲基琥珀酸酯11。后一种化合物进一步转化为蚂蚁毒液生物碱(R)- lepto胸碱1和(R)-3-甲基- n -(2-苯乙基)-吡咯烷2的天然对映体。
{"title":"A New Approach for Asymmetric Synthesis of (R)-3-Methylpyrrolidine Alkaloids from (S)-Malic Acid","authors":"Xiao Zheng, Pei‐Qiang Huang, Yuanping Ruan, A. Lee, W. Chan","doi":"10.1080/1057563029001/4854","DOIUrl":"https://doi.org/10.1080/1057563029001/4854","url":null,"abstract":"Diastereoselective methylation of dimethyl (S)-malate 7, followed by two, three-step reductive de-hydroxylation procedures afforded dimethyl (R)-2-methylsuccinate 11 in 80.2% e.e. and 84.7% e.e., respectively. The latter compound was further transformed into the natural enantiomers of the ant venom alkaloids (R)-leptothoracine 1 and (R)-3-methyl-N-(2-phenylethyl)-pyrrolidine 2.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"44 1","pages":"53 - 56"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79706951","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 : 2002-01-01DOI: 10.1080/10575630290020532
R. Reyes‐Chilpa, M. Jiménez-Estrada, Marcia V Godínez, S. Hernández-Ortega, M. Campos, E. Bejar
A new cacalolide sesquiterpenoid, named as Romo-A, was isolated from the roots of Psacalium decompositum , Asteraceae, a Mexican medicinal shrub with antidiabetic properties. Its structure was elucidated by NMR, MS, IR, UV, and confirmed by X-ray diffraction studies.
{"title":"A Novel Cacalolide from Psacalium Decompositum","authors":"R. Reyes‐Chilpa, M. Jiménez-Estrada, Marcia V Godínez, S. Hernández-Ortega, M. Campos, E. Bejar","doi":"10.1080/10575630290020532","DOIUrl":"https://doi.org/10.1080/10575630290020532","url":null,"abstract":"A new cacalolide sesquiterpenoid, named as Romo-A, was isolated from the roots of Psacalium decompositum , Asteraceae, a Mexican medicinal shrub with antidiabetic properties. Its structure was elucidated by NMR, MS, IR, UV, and confirmed by X-ray diffraction studies.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"102 12 1","pages":"239 - 242"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88749976","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 : 2002-01-01DOI: 10.1080/10575630290020604
J. Makangara, S. Jonker, M. Nkunya
Two new natural products, the phenanthrenoid puguenolide (6-hydroxy-3-methoxy-4-oxapyren-5-one) and isoangoletin were isolated from the stem bark of the newly described Uvaria species, U. puguensis D.M. Johnson, together with the sesquiterpene guaiol and the usual C-benzyldihydrochalcones previously found in the genus Uvaria , viz . uvaretin, diuvaretin, chamuvaritin and a mixture of triuvaretin and isotriuvaretin. Structural elucidation was achieved through a combination of spectroscopic methods.
{"title":"A Novel Phenanthrenolide and C-Benzyl Dihydrochalcones from Uvaria Puguensis","authors":"J. Makangara, S. Jonker, M. Nkunya","doi":"10.1080/10575630290020604","DOIUrl":"https://doi.org/10.1080/10575630290020604","url":null,"abstract":"Two new natural products, the phenanthrenoid puguenolide (6-hydroxy-3-methoxy-4-oxapyren-5-one) and isoangoletin were isolated from the stem bark of the newly described Uvaria species, U. puguensis D.M. Johnson, together with the sesquiterpene guaiol and the usual C-benzyldihydrochalcones previously found in the genus Uvaria , viz . uvaretin, diuvaretin, chamuvaritin and a mixture of triuvaretin and isotriuvaretin. Structural elucidation was achieved through a combination of spectroscopic methods.","PeriodicalId":18873,"journal":{"name":"Natural Product Letters","volume":"76 1","pages":"267 - 272"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75157649","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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