A series of 22 donepezil analogues were synthesized through alkylation/benzylation and compared to donepezil and its 6-O-desmethyl adduct. All the compounds were found to be potent inhibitors of both acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), two enzymes responsible for the hydrolysis of the neurotransmitter acetylcholine in Alzheimer’s disease patient brains. Many of them displayed lower inhibitory concentrations of EeAChE (IC50 = 0.016 ± 0.001 µM to 0.23 ± 0.03 µM) and EfBChE (IC50 = 0.11 ± 0.01 µM to 1.3 ± 0.2 µM) than donepezil. One of the better compounds was tested against HsAChE and was found to be even more active than donepezil and inhibited HsAChE better than EeAChE. The analogues with the aromatic substituents were generally more potent than the ones with aliphatic substituents. Five of the analogues also inhibited the action of β-secretase (BACE1) enzyme.
一系列22个多奈哌齐类似物通过烷基化/苄基化合成,并与多奈哌齐及其6-去甲基加合物进行比较。发现所有化合物均是乙酰胆碱酯酶(AChE)和丁酰胆碱酯酶(BChE)的有效抑制剂,这两种酶在阿尔茨海默病患者大脑中负责水解神经递质乙酰胆碱。许多化合物的EeAChE(IC50 = 0.016 ± 0.001 µM至0.23 ± 0.03 µM)和EfBChE(IC50 = 0.11 ± 0.01 µM至1.3 ± 0.2 µM)的抑制浓度低于多奈哌齐。其中一种较好的化合物对HsAChE进行了测试,发现其比多奈哌齐更活跃,并且比EeAChE更好地抑制了HsAChE。具有芳香族取代基的类似物通常比具有脂肪族取代基的类似物更有效。其中五种类似物还抑制了β-分泌酶(BACE1)酶的作用。