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Open AccessFeature PaperArticle

A Tri-O-Bridged Diels-Alder Adduct from Cortex Mori Radicis

1
State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
2
Institute of Medicinal of Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
3
GRU Cancer Center, Augusta University, Augusta, GA 30912, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this paper.
Molecules 2018, 23(1), 133; https://doi.org/10.3390/molecules23010133
Received: 11 December 2017 / Revised: 7 January 2018 / Accepted: 7 January 2018 / Published: 9 January 2018
(This article belongs to the Section Natural Products Chemistry)
Sanggenon X, an unusual tri-O-bridged Diels-Alder adduct, was isolated from Cortex Mori Radicis. Its structure was established by spectroscopic analysis, including NMR and HR-MS (High Resolution Mass Spectrometry). Sanggenon X contained three O-bridged rings, where the oxygenated bridgeheads were all quaternary carbons. Chemical methylation was carried out to deduce the linkages of the three O-bridges. The absolute configuration was determined by calculating the ECD (Electronic Circular Dichroism) using the TDDFT (Time-Dependent Density Functional Theory) method. Sanggenon X showed significant antioxidant activity against Fe2+-Cys-induced lipid peroxidation in rat liver microsomes, and was as effective as the positive control, curcumin. View Full-Text
Keywords: Cortex Mori Radicis; Morus; Diels-Alder adduct; calculated ECD; antioxidation Cortex Mori Radicis; Morus; Diels-Alder adduct; calculated ECD; antioxidation
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MDPI and ACS Style

Lu, A.-Q.; Chen, M.-H.; Gao, J.; Wang, L.; Yang, H.-Y.; Li, L.; Zhang, B.; He, H.-K.; Wang, S.-J. A Tri-O-Bridged Diels-Alder Adduct from Cortex Mori Radicis. Molecules 2018, 23, 133. https://doi.org/10.3390/molecules23010133

AMA Style

Lu A-Q, Chen M-H, Gao J, Wang L, Yang H-Y, Li L, Zhang B, He H-K, Wang S-J. A Tri-O-Bridged Diels-Alder Adduct from Cortex Mori Radicis. Molecules. 2018; 23(1):133. https://doi.org/10.3390/molecules23010133

Chicago/Turabian Style

Lu, An-Qi; Chen, Ming-Hua; Gao, Jie; Wang, Lu; Yang, Han-Yu; Li, Lan; Zhang, Bo; He, Hao-Ke; Wang, Su-Juan. 2018. "A Tri-O-Bridged Diels-Alder Adduct from Cortex Mori Radicis" Molecules 23, no. 1: 133. https://doi.org/10.3390/molecules23010133

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