Journal
PHYTOCHEMISTRY
Volume 204, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2022.113439
Keywords
Amaryllidaceae; Structure elucidation; Alkaloids; Alzheimer?s disease; Carltonines; Atropisomerism; Specific rotation revised; Narcissus pseudonarcissus (L; ) cv; Carlton
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Funding
- Charles University
- project Aktion Austria -Czech Republic of OeAD [MPC-2021-01496]
- project Pre -application research into innovative medicines and medical technologies (InoMed) [CZ.02.1.01/0.0/0.0/18_069/0010046]
- European Union
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A new isolated alkaloid, Narciindole A, was obtained from the bulbs of Narcissus pseudonarcissus. Its structure showed a similar structural motif as another known dimeric alkaloid, carltonine C. The biosynthetic pathway of dimeric carltonine-type alkaloids was proposed. However, the isolated alkaloids exhibited only moderate inhibition of human acetylcholinesterase and/or butyrylcholinesterase.
Narciindole A, the first representative of Amaryllidaceae alkaloids with an indol-3-ylmethanone framework, was isolated from bulbs of Narcissus pseudonarcissus (L.) cv. Carlton, together with carltonine D and carltonine E, which share the same unusual structural motif as dimeric carltonine C (reported in 2020), exhibiting atropisomerism. Unambiguous structure elucidations have been achieved by NMR spectroscopy, HRMS, and comparison with literature data of related alkaloids. Furthermore, the chirality of known alkaloids with a galanthindole biaryl core was revised using optical rotation. Last, but not least, a biosynthetic pathway for dimeric carltonine-type alkaloids was proposed. Unfortunately, in terms of biological activity, the isolated alkaloids showed only moderate inhibition of human acetylcholinesterase and/or butyrylcholinesterase.
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