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Front Cover: Chiral Isolation and Absolute Configuration of (+)‐ and (−)‐Xanchryones F and G from Xanthostemon chrysanthus (C&B 1/2020)
Author(s) -
Liu Fen,
Wu Yan,
Li NiPing,
Liu JiaoWen,
Wang Lei,
Ye WenCai
Publication year - 2020
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.201900723
Subject(s) - chemistry , enantiomer , epimer , stereochemistry , tautomer , absolute configuration , enol , myrtaceae , front cover , stereocenter , cover (algebra) , botany , enantioselective synthesis , organic chemistry , biology , catalysis , mechanical engineering , engineering
Front Cover . The plant Xanthostemon chrysanthus (Myrtaceae) is widely distributed in northern Australia and southeast Asia. In a search for structurally unique and bioactive natural products from Myrtaceae plants, the first examples of cinnmaoyltriketone‐flavone adducts with new skeleton, (+)‐ and (−)‐xanchryones F and G ((+)‐ and (−)‐ 1 and 2 ), were obtained by chiral HPLC from X. chrysanthus . These compounds have the same planar structure, among which, 1 and 2 are C‐9' epimers, (±)‐ 1 and (±)‐ 2 are two pairs of enantiomers. Interestingly, each enantiomer existed as keto‐enol tautomers in solution, as reported by Fen Liu , Yan Wu et al . in their full paper at 10.1002/cbdv.201900683.