6,9-Dichloro-1,2,3,4-tetrahydroacridine is a synthetic intermediate in the synthesis of tacrine-based acetylcholinesterase (AChE) inhibitors.1It is also an intermediate in the synthesis of multifunctional tacrine hybrids that possess radical scavenging, amyloid-β aggregation inhibitory, and or β-secretase 1 (BACE1) inhibitory activities in addition to their activity as AChEinhibitors.2,3 1.Recanatini, M., Cavalli, A., Belluti, F., et al.SAR of 9-amino-1,2,3,4-tetrahydroacridine-based acetylcholinesterase inhibitors: Synthesis, enzyme inhibitory activity, QSAR, and structure-based CoMFA of tacrine analoguesJ. Med. Chem.43(10)2007-2018(2000) 2.Digiacomo, M., Chen, Z., Wang, S., et al.Synthesis and pharmacological evaluation of multifunctional tacrine derivatives against several disease pathways of ADBioorg. Med. Chem. Lett.25(4)807-810(2015) 3.Li, S.Y., Jiang, N., Xie, S.S., et al.Design, synthesis and evaluation of novel tacrine-rhein hybrids as multifunctional agents for the treatment of Alzheimer's diseaseOrg. Biomol. Chem.12(5)801-814(2014)
Donecopride is a partial agonist of the serotonin (5-HT) receptor subtype 5-HT4E(Ki= 8.5 nM) and an inhibitor of acetylcholinesterase (AChE; IC50= 16 nM).1It is selective for AChE over butyrylcholinesterase (BChE; IC50= 3,530 nM) but does bind to 5-HT2Band sigma-2 (σ2) receptors (Ki= 1.6 nM for both) in a panel of 42 neurotransmitter receptors and transporters. Donecopride induces release of soluble amyloid precursor protein-α (sAPP-α) in COS-7 cells transiently expressing 5-HT4with an EC50value of 11.3 nM. Oral administration of donecopride (1 mg/kg) reduces brain soluble and insoluble amyloid-β (1-42) levels and increases the time spent exploring the novel object in the novel object recognition (NOR) test in the 5XFAD transgenic mouse model of Alzheimer's disease. Donecopride (3 mg/kg, p.o.) prevents a reduction in spontaneous alternation behavior induced by intracerebroventricular administration of soluble Aβ42 (sAβ42) in the Y-maze in mice.2 1.Lecoutey, C., Hedou, D., Freret, T., et al.Design of donecopride, a dual serotonin subtype 4 receptor agonist/acetylcholinesterase inhibitor with potential interest for Alzheimer's disease treatmentProc. Natl. Acad. Sci. USA111(36)E3825-E3830(2014) 2.Rochais, C., Lecoutey, C., Hamidouche, K., et al.Donecopride, a Swiss army knife with potential against Alzheimer's diseaseBr. J. Pharmacol.177(9)1988-2005(2020)