Our continued works on the chemical constituents of Ginkgo biloba (G. biloba) leaves has led to the isolation of two novel phenylbutenoids (1, 2), along with five previously unidentified terpene glycosides (3−7). Among them, compounds 1 and 2 represent unique (Z)-phenylbutenoids, 3−6 are megastigmane glycosides, and 7 is identified as a rare bilobanone glycoside (Fig. 1). This study marks the first reported isolation of phenylbutenoid and bilobanone glycoside from G. biloba. The chemical structures of these compounds were elucidated through extensive spectroscopic analysis, including HR-ESI-MS and various 1D and 2D NMR experiments. Furthermore, the absolute configurations of these molecules were determined using Mosher’s method, ECD experiments, and Cu-Kα X-ray crystallographic analyses.
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Funding
National Natural Science Foundation of China(82141203)
National Natural Science Foundation of China(82003624)
National Natural Science Foundation of China(82004003)
National Natural Science Foundation of China(82004215)
Science and Technology Commission of Shanghai Municipality(20YF1458700)
Science and Technology Commission of Shanghai Municipality(20YF1459000)
Innovation Team and Talents Cultivation Program of National Administration of Traditional Chinese Medicine(ZYYCXTDD-202004)
Shanghai Frontiers Science Center of TCM Chemical Biology, Shanghai Engineering Research Center for the Preparation of Bioactive Natural Products(16DZ2280200)
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