Synthesis, biological evaluation of 9-N-substituted berberine derivatives as multi-functional agents of antioxidant, inhibitors of acetylcholinesterase, butyrylcholinesterase and amyloid-β aggregation
作者:Wen-Jun Shan、Ling Huang、Qi Zhou、Fan-Chao Meng、Xing-Shu Li
DOI:10.1016/j.ejmech.2011.09.051
日期:2011.12
A series of 9-N-substituted berberine derivatives were synthesized and biologically evaluated as antioxidant and inhibitors of acetylcholinesterase (AChE), butyrylcholinesterase and amyloid-beta aggregation. Most of these compounds exhibited very good antioxidant activities, inhibitive activities of AChE and amyloid-beta aggregation. Among them, compound 8d, (o-methylphenethyl)amino linked at the 9-position of berberine, was found to be a good antioxidant (with 4.05 mu M of Trolox equivalents), potent inhibitor of AChE (an IC50 value of 0.027 mu M), and high active inhibitor of amyloid-beta aggregation (an IC50 value of 2.73 mu M). (C) 2011 Elsevier Masson SAS. All rights reserved.
A novel amination of isoquinolinium salts nucleophilic substitution reaction
Experimental and quantum-chemical study of nucleophilic substitution mechanism in berberine
作者:Oleg N. Burov、Mikhail E. Kletskii、Nikita S. Fedik、Sergey V. Kurbatov、Anton V. Lisovin
DOI:10.1007/s10593-016-1810-1
日期:2015.11
(DFT/B3LYP) with 6-31G** basis set. The nucleophilic substitution of 9-metoxy group with primary amine was shown to proceed through a stage of σ-complex formation and led to 9-alkylamino derivatives of berberine. Analogous substitution with a secondary amine did not occur due to unfavorable thermodynamic parameters. The secondary amine participated in this reaction not as the attacking nucleophile, but rather