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Publication Metadata only Revision of the NMR assignments of pterostlbene and of dihydrodehydrodiconiferyl alcohol: Cytotoxic constituents from anogeissus acuminata(1994-07-01) Agnes M. Rimando; John M. Pezzuto; Norman R. Farnsworth; Thawatchai Santisuk; Vichai Reutrakul; University of Illinois at Chicago; The Forest Herbarium, Thailand Ministry of Natural Resources and Environment; Mahidol Universitythe precise assignment of the 'H NMR chemical shifts of 2. Compounds 1–3 exhibited in vitro cytotoxicity in various cancer cell lines. This is the first isolation of 1–3 from Anogeissus. © 1994, Taylor & Francis Group, LLC. All rights reserved.Publication Metadata only α-sulfonyl radical initiated intramolecular tandem radical cyclization: Stereochemistries of a pair of doubly cyclized products(2003-08-12) Lindsay T. Byrne; Manat Phomakotr; Chompoonut Poolsanong; Vichai Reutrakul; Brian W. Skelton; Allan H. White; University of Western Australia; Mahidol Universitytandem radical cyclization of H2C=CH(CH2)CRBrSO2Ph (R = H, CH3), confirming the assigned structures and rigorously establishing the trans relationship at the ring junctions.Publication Metadata only Cytotoxic Coumarins from Mammea harmandii(2003-11-01) Vichai Reutrakul; Pornsiri Leewanich; Patoomratana Tuchinda; Manat Pohmakotr; Thaworn Jaipetch; Samaisukh Sophasan; Thawatchai Santisuk; Mahidol University; Thailand Royal Forest Departmentagainst a panel of mammalian cancer cell lines. Their structures were determined by spectroscopic methods. The assignments of13C-NMR signals of isomesuol (1), which was isolated for the first time as a natural product, have been revised.Publication Metadata only Electrophilic difluoro(phenylthio)methylation: Generation, stability, and reactivity of α-fluorocarbocations(2013-11-15) Nolan M. Betterley; Panida Surawatanawong; Samran Prabpai; Palangpon Kongsaeree; Chutima Kuhakarn; Manat Pohmakotr; Vichai Reutrakul; Mahidol UniversityElectrophilic difluoro(phenylthio)methylation of allylsilanes has been achieved using bromodifluoro(phenylthio)methane (PhSCF2Br) and silver hexafluoroantimonate (AgSbF6). The structural assignment and observation of α-fluorocarbocation werePublication Metadata only Anti-inflammatory cyclohexenyl chalcone derivatives in Boesenbergia pandurata(2002-01-31) Patoomratana Tuchinda; Vichai Reutrakul; Per Claeson; Ubonwan Pongprayoon; Tuanta Sematong; Thawatchai Santisuk; Walter C. Taylor; Mahidol University; Thailand Institute of Scientific and Technological Research (TISTR); Thailand Royal Forest Department; The University of Sydneyvariety of Boesenbergia pandurata (Robx.) Schltr. [currently known as Boesenbergia rotunda (L.) Mansf., Kulturpfl.]. Their structures were assigned on the basis of their spectroscopic data. (-)-Hydroxypanduratin A and (-)-panduratin A showed significantPublication Metadata only Crystal structure of panduratin A: (l′RS, 2′SR, 6′RS)-(2, 6-Dihydroxy-4-methoxyphenyl)- [3′-methyl-2′-(3″-methylbut-2″-enyl)- 6′-phenylcyclohex-3′-enyl]methanone(1984-01-01) Orasa Pancharoen; Vichai Reutrakul; Brian W. Skelton; Walter C. Taylor; Pittaya Tuntiwachwuttikul; Allan H. White; Thailand Ministry of Public Health; Mahidol University; University of Western Australia; The University of SydneySingle-crystal X-ray structure determination of the title compound, C26H30O4, confirms the stoichiometry, connectivity and stereochemistry recently assigned spectroscopically. Crystals are monoclinic, P21/n, a 10.140(5), b 24.85(1), c 9.415(4) Å, βPublication Metadata only Pimarane diterpenes from Kaempferia pulchra(1994-01-01) Patoomratana Tuchinda; Jinda Udchachon; Vichai Reutrakul; Thawatchai Santisuk; Brian W. Skelton; Allan H. White; Walter C. Taylor; Mahidol University; The Forest Herbarium, Thailand Ministry of Natural Resources and Environment; University of Western Australia; The University of Sydneysource. The structures were assigned by spectroscopic methods. A single-crystal X-ray diffraction analysis confirmed the structure of 2α-acetoxysandaracopimaradien-1α-ol. © 1994.Publication Metadata only Concise synthesis and confirmation of the absolute configurations of naturally occurring bioactive 2,7′-cyclolignans(2021-03-02) Nannaphat Chumsri; Chutima Kuhakarn; Pawaret Leowanawat; Vichai Reutrakul; Darunee Soorukram; Mahidol Universityconfigurations of natural 4,4′-dihydroxy-3′,5,5′-trimethoxy-2,7′-cyclolignan and those of natural 4,4′-dihydroxy-3,3′,5-trimethoxy-2,7′-cyclolignan were assigned as (7′S,8S,8′S) and (7′R,8R,8′R), respectively, based on the experimental circular dichroism (CDPublication Metadata only Plant anticancer agents, l. cytotoxic triterpenes from sandoricum koetjape stems(1992-05-01) Norito Kaneda; John M. Pezzuto; Douglas Kinghorn; Norman R. Farnsworth; Thawatchai Santisuk; Patoomratana Tuchinda; Jinda Udchachon; Vichai Reutrakul; University of Illinois at Chicago; Thailand Royal Forest Department; Mahidol Universityintense, cytotoxicity was also observed with a variety of cultured human cancer cells. The13C-nmr chemical shifts of these triterpenes were assigned unambiguously using selective INEPT nmr experiments. Aside from compounds 2 and 3, these substances werePublication Metadata only Cytotoxic and anti-HIV-1 constituents from leaves and twigs of Gardenia tubifera(2004-02-09) Vichai Reutrakul; Chongkon Krachangchaeng; Patoomratana Tuchinda; Manat Pohmakotr; Thaworn Jaipetch; Chalobon Yoosook; Jittra Kasisit; Samaisukh Sophasan; Kulawee Sujarit; Thawatchai Santisuk; Mahidol University; The Forest Herbarium, Thailand Ministry of Natural Resources and Environmentflavone 5,3′,5′-trihydroxy-7, 4′-dimethoxyflavone (5), five known flavones 6-10 and hexacosyl 4′-hydroxy-trans-cinnamate (11) were also obtained from the same source. The structures were assigned on the basis of spectroscopic methods. Compounds 3, 7, 9