期刊
PHYTOCHEMISTRY
卷 211, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2023.113678
关键词
Melodinus fusiformis Champ; ex benth; Apocynaceae; Monoterpenoid indole alkaloids; Dimeric alkaloids; Neuroprotection effect
Eight unprecedented monoterpenoid indole alkaloid (MIA) adducts and dimers, melofusinines A-H (1-8), and three undescribed melodinus-type MIA monomers, melofusinines I-K (9-11), were isolated from Melodinus fusiformis. Compounds 1 and 2 are hybrid indole alkaloids incorporating an aspidospermatan-type MIA with a monoterpenoid alkaloid unit. Compounds 3-8 are the first MIA dimers constructed through an aspidospermatan-type monomer and a rearranged melodinus-type monomer.
Eight unprecedented monoterpenoid indole alkaloid (MIA) adducts and dimers, melofusinines A-H (1-8), and three undescribed melodinus-type MIA monomers, melofusinines I-K (9-11), together with six putative bioge-netic precursors were isolated from the twigs and leaves of Melodinus fusiformis Champ. ex Benth. Compounds 1 and 2 are unusual hybrid indole alkaloids incorporating an aspidospermatan-type MIA with a monoterpenoid alkaloid unit via C-C coupling. Compounds 3-8 feature the first MIA dimers constructed through an aspidospermatan-type monomer and a rearranged melodinus-type monomer with two different types of cou-plings. Their structures were elucidated by spectroscopic data, single crystal X-ray diffraction, and calculated electric circular dichroism spectra analysis. In addition, dimers 5 and 8 showed significant neuroprotection ef-fects on MPP +-injured primary cortical neurons.
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