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11 results on '"Sriyatep, Teerayut"'

5. Resolution and identification of scalemic caged xanthones from the leaf extract of Garcinia propinqua having potent cytotoxicities against colon cancer cells

Author

Sriyatep, Teerayut, primary, Tantapakul, Cholpisut, additional, Andersen, Raymond J., additional, Patrick, Brian O., additional, Pyne, Stephen G., additional, Muanprasat, Chatchai, additional, Seemakhan, Sawinee, additional, Borwornpinyo, Suparerk, additional, and Laphookhieo, Surat, additional

Published
2018
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9. Biotransformation of β-Mangostin by an Endophytic Fungus of Garcinia mangostanato Furnish Xanthenes with an Unprecedented Heterocyclic Skeleton

Author

Arunrattiyakorn, Panarat, Kuno, Mayuso, Aree, Thammarat, Laphookhieo, Surat, Sriyatep, Teerayut, Kanzaki, Hiroshi, Garcia Chavez, Miguel Angel, Wang, Yan Alexander, and Andersen, Raymond J.

Abstract

Biotransformation of β-mangostin (1) by the endophytic fungus Xylaria feejeensisGM06 afforded hexacyclic ring-fused xanthenes with an unprecedented hexacyclic heterocylic skeleton. β-Mangostin (1) was transformed to two diastereomeric pairs of enantiomers, mangostafeejin A [(−)-2a/(+)-2b)] and mangostafeejin B [(−)-3a/(+)-3b)]. The chemical structures of the transformation products were elucidated by analysis of NMR and MS data, and the structure of mangostafeejin A [(−)-2a/(+)-2b)] was confirmed by single-crystal X-ray diffraction analysis. The absolute configurations of 3aand 3bwere established on the basis of calculated and measured ECD data using the ECD spectra of 2aand 2bas models. The fungal biotransformation described herein provides an effective method to convert an abundant achiral plant natural product scaffold into new chiral heterocyclic scaffolds representing expanded chemical diversity for biological activity screening.

Published
2018
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11. Cowabenzophenones A and B, two new tetracyclo[7.3.3.33,11.03,7]tetradecane-2,12,14-trione derivatives, from ripe fruits of Garcinia cowa.

Author

Sriyatep, Teerayut, Maneerat, Wisanu, Sripisut, Tawanun, Cheenpracha, Sarot, Machan, Theeraphan, Phakhodee, Wong, and Laphookhieo, Surat

Subjects
*ALTERNATIVE medicine, *PHYSICAL & theoretical chemistry, *FRUIT, *MEDICINAL plants, *SPECTRUM analysis, *PLANT extracts, *DESCRIPTIVE statistics
Abstract

Abstract: Two new tetracyclo[7.3.3.33,11.03,7]tetradecane-2,12,14-trione derivatives, cowabenzophenones A (1) and B (2), were isolated from ripe fruits of Garcinia cowa Roxb. Their structures were determined by spectroscopic methods. The tetracyclo[7.3.3.33,11.03,7]tetradecane-2,12,14-trione skeleton from the Garcinia genus is reported for the first time. [Copyright &y& Elsevier]

Published
2014
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