Isolation and detailed 1H and 13C NMR structural assignment for three trachylobanes from Psiadia punctulata (Asteraceae) grown in Africa |
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| Institution: | 1. Núcleo de Pesquisas em Ciências Exatas e Tecnológicas da Universidade de Franca, Av. Dr. Armando de Salles Oliveira, 201, 14404-600, Franca, SP, Brazil;2. Departamento de Química da Faculdade de Filosofia, Ciências e Letras da Universidade de São Paulo, Av. Bandeirantes, 3900, 14040-901, Ribeirão Preto, SP, Brazil;3. Department of Chemistry, University of Nairobi, P.O. Box 30197, 00100, Nairobi, Kenya;1. Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry and Pharmacy, Northwest A&F University, Yangling 712100, China;2. Key Laboratory of Regional Ecological Environment Analysis and Pollution Control of West Guangxi, School of Chemistry and Environment Engineering, Baise University, Baise 533000, China;1. Faculty of Chemistry, VNUHCM-University of Science, 227 Nguyen Van Cu, District 5, Ho Chi Minh City, Viet Nam;2. Vietnam National University Ho Chi Minh City, Ho Chi Minh City, Viet Nam;3. Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;4. Department of Biological Resources, Institute of Tropical Biology, VAST, 85 Tran Quoc Toan, Ho Chi Minh City, Viet Nam;1. Faculty of Engineering, University of Miyazaki, Gakuen-Kibanadai, Miyazaki, 889-2192, Japan;2. Center for Collaborative Research and Community Cooperation, University of Miyazaki, Gakuen-Kibanadai, Miyazaki, 889-2192, Japan;3. Sunao Pharma Inc., Miyazaki, 880-0866, Japan;1. School of Pharmacy, Youjiang Medical University for Nationalities, 98 Chengxiang Road, Baise, 533000, PR China;2. Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alaer, 843300, PR China;3. State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Longmian Road, Nanjing, 211198, PR China;4. Guangxi Database Construction and Application Engineering Research Center for Intracorporal Pharmacochemistry of TCM, 98 Chengxiang Road, Baise, 533000, PR China;1. Department of Food Science, Tunghai University, No. 1727, Sec. 4, Taiwan Boulevard, Xitun District, Taichung, 40704, Taiwan;2. Department of Radiation Oncology, Taichung Veterans General Hospital, No. 1650, Sec. 4, Taiwan Boulevard, Xitun District, Taichung, 40705, Taiwan |
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| Abstract: | The first isolation of a trachylobane from an African specimen of Psiadia punctulata (Asteraceae) is presented in this paper. A complete 1H and 13C NMR spectral analysis of this compound and two other trachylobane diterpenes, previously isolated from the same plant, are also provided. The use of NMR techniques such as gCOSY, gHSQC, gHMBC and 2D-J-resolved, in combination with a software-assisted methodology, led to a complete and unequivocal assignment of 1H and 13C signals. This was achieved together with the measurement of all homonuclear hydrogen coupling constants. The presented detail level of the assignment data has never been published before for trachylobanes. Furthermore, with all determined NMR experimental data from the spectra and to obtain a reliability assessment, signals were simulated in the FOMSC3 and NMR_MultSim software. |
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| Keywords: | Complete NMR assignment 2D NMR Trachylobane diterpenes |
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