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5-Methyl-N-(8-(5,6,7,8-tetrahydroacridin-9-ylamino)octyl)-5H-indolo[2,3-b]quinolin-11-amine: a highly potent human cholinesterase inhibitor

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Abstract

The synthesis, cholinesterase inhibition, molecular modelling and ADME properties of novel tacrine–neocryptolepine heterodimers are described. Compound 3 [5-methyl-N-(8-(5,6,7,8-tetrahydroacridin-9-ylamino)octyl)-5H-indolo[2,3-b]quinolin-11-amine], showing a moderate inhibition of the Aβ1–42 self-aggregation (26.5% at a 1 : 5 ratio with Aβ1–42), and a calculated log BB value (0.27) indicating excellent potential BBB penetration, is a highly potent human cholinesterase inhibitor [IC50 (hAChE) = 0.95 ± 0.04 nM; IC50 (hBuChE) = 2.29 ± 0.14 nM] which can be listed among the most potent hAChE inhibitors so far identified, and is not hepatotoxic in vitro at the concentrations at which the ChEs are inhibited. A molecular modeling study was also undertaken in order to elucidate the AChE and the BuChE bind modes of all the new compounds. The docking results show that all of them bind to AChE in extended conformations and to BuChE in folded conformations. Moreover, these studies revealed that the length of the linker is crucial to binding both the catalytic anionic site and the peripheral anionic site.

Graphical abstract: 5-Methyl-N-(8-(5,6,7,8-tetrahydroacridin-9-ylamino)octyl)-5H-indolo[2,3-b]quinolin-11-amine: a highly potent human cholinesterase inhibitor

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Publication details

The article was received on 21 Mar 2017, accepted on 26 Apr 2017 and first published on 28 Apr 2017


Article type: Research Article
DOI: 10.1039/C7MD00143F
Citation: Med. Chem. Commun., 2017, Advance Article
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    5-Methyl-N-(8-(5,6,7,8-tetrahydroacridin-9-ylamino)octyl)-5H-indolo[2,3-b]quinolin-11-amine: a highly potent human cholinesterase inhibitor

    L. Wang, I. Moraleda, I. Iriepa, A. Romero, F. López-Muñoz, M. Chioua, T. Inokuchi, M. Bartolini and J. Marco-Contelles, Med. Chem. Commun., 2017, Advance Article , DOI: 10.1039/C7MD00143F

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