The overlooked rotational isomerism of C-glycosyl flavonoids
作者: Guohong ZhouRenliang YanXiaogen WangShaolin LiJin LinJia LiuZhendong Zhao
作者单位: 1Guangdong Food and Drug Vocational College
刊名: Phytochemistry Reviews, 2019, Vol.18 (2), pp.443-461
来源数据库: Springer Journal
DOI: 10.1007/s11101-019-09601-7
关键词: Rotational isomerismRotamerAtropisomerismC-glycosyl flavonoidsRestricted rotation
英文摘要: Abstract(#br)C-glycosyl flavonoids are important secondary plant metabolites with a wide range of biological activities. Rotational isomerism, arising from restricted bond rotation, has been observed on a portion of C-glycosyl flavonoids. NMR technique contributes most to the observation and research of this phenomenon. Signal duplication in NMR spectra may be the key characteristic of C-glycosyl flavonoids existing as rotamers. Bulky steric hindrance from the substituents at position 7 and sugar moieties are responsible for the restricted bond rotation. There are other influence factors including temperature, solvents, H-bonds and π-stacking, but these are of lesser importance. Difference exists between 8-C-glycosyl flavonoids and their 6-C-glycosyl isomers despite sharing the same...
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影响因子:4.147 (2012)

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