Amaryllidaceae alkaloids with new framework types from Zephyranthes candida as potent acetylcholinesterase inhibitors.

Abstract:

:Three new Amaryllidaceae alkaloids, named zephycandidines I-III (1-3), were isolated from Zephyranthes candida. The structures of 1-3 were elucidated by spectroscopic analyses including HRESIMS, 1H NMR, 13C NMR, DEPT, HSQC, 1H-1H COSY, HMBC, ROESY, and electronic circular dichroism (ECD), as well as ECD calculation. The absolute configuration of 1 was finally established by single crystal X-ray diffraction using Cu Kα radiation. Zephycandidines I (1) and III (3) with new framework types represent the first example of 7-phenyl-hexahydroindole and 5,2'-dimethyl-biphenyl-2-ylamine alkaloids, respectively, and their plausible biosynthetic pathway are proposed. Zephycandidine II (2) is the first C3a-phenyl-hexahydroindole type alkaloid isolated from the genus of Zephyranthes. These new alkaloids 1-3 were evaluated for their acetylcholinesterase (AChE) inhibitory activities, and 3 showed potent AChE inhibitory activity with an IC50 value of 8.82 μM, suggesting that the framework of 5,2'-dimethyl-biphenyl-2-ylamine in 3 may be a potential group for the AChE inhibitory activity. The docking studies of 1-3 and galanthamine with AChE revealed that interactions with W286 and Y337 are necessary for the AChE inhibitory activity.

journal_name

Eur J Med Chem

authors

Zhan G,Liu J,Zhou J,Sun B,Aisa HA,Yao G

doi

10.1016/j.ejmech.2016.10.057

subject

Has Abstract

pub_date

2017-02-15 00:00:00

pages

771-780

eissn

0223-5234

issn

1768-3254

pii

S0223-5234(16)30920-5

journal_volume

127

pub_type

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