Identification and optimization of piperine analogues as neuroprotective agents for the treatment of Parkinson’s disease via the activation of Nrf2/keap1 pathway
摘要:
Parkinson's disease (PD) is a slowly progressive and complex neurodegenerative disorder. Up to date, there are no approved drugs that could slow or reverse the neurodegenerative process of PD. Here, we reported the synthesis of series of piperine analogues and the evaluation of their neuroprotective effects against hydrogen peroxide (H2O2) induced damage in the neuron-like PC12 cells. Among these analogues, 3b exhibited the most potent protection effect and its underlying mechanism was further investigated. Further results indicated that the ROS scavenging and cytoprotection effect of 3b might be related to the Nrf2 activation and upregulation of related phase II antioxidant enzymes, such as HO-1 and NQO1. In in vivo study, oral administration (100 mg/kg) of 3b significantly attenuated PD-associated behavioral deficits in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced mouse model of PD and protected tyrosine hydroxylase-immunopositive dopaminergic neurons. Our results provided evidence that 3b might be a promising candidate for Parkinson's disease treatment. (C) 2020 Elsevier Masson SAS. All rights reserved.
Microwave-assisted one-pot synthesis of a, β-unsaturated amides under solvent-free conditions
作者:Shilei Jiang、Yuanyuan Xie、Xiaochun Yu
DOI:10.3184/030823409x393682
日期:2009.1
Undermicrowave-assistedsolvent-freeconditions a one-pot reaction of triphenylphosphine, an aldehyde and N, N-diethyl chloroacetamide in the presence of zinc dust affords α, β-unsaturated amides stereoselectively in good yield. In comparison with the conventional heating method, the reaction was finished within five minutes under microwave irradiation.
在微波辅助的无溶剂条件下,三苯基膦、醛和 N, N-二乙基氯乙酰胺在锌粉存在下的一锅反应以良好的收率立体选择性地提供了 α, β-不饱和酰胺。与传统的加热方法相比,在微波照射下,反应在五分钟内完成。
Electron-Catalyzed Aminocarbonylation: Synthesis of α,β-Unsaturated Amides from Alkenyl Iodides, CO, and Amines
Aminocarbonylation of alkenyl iodides with CO and amines proceeded under heating to produce α,β-unsaturatedamides in good yields (23 examples, 71% average yield). This catalyst-free method exhibited good functional-group tolerance, and open a straightforward access to functionalized acrylamides, as illustrated by the synthesis of Ilepcimide. A hybrid radical/ionic mechanism involving chain electron transfer is
烯基碘与 CO 和胺的氨基羰基化在加热下进行,以良好的产率(23 个实例,71% 的平均产率)产生 α,β-不饱和酰胺。这种无催化剂的方法表现出良好的官能团耐受性,并打开了对官能化丙烯酰胺的直接访问,如 Ilepcimide 的合成所示。针对这种转变提出了一种涉及链式电子转移的混合自由基/离子机制。
Synthesis of α,β-Unsaturated Amide via Phosphonium Ylide
作者:Shilei Jiang、Kefeng Yang、Xiaochun Yu
DOI:10.1080/00397910802590902
日期:2009.4.22
A series of ,-unsaturated amides were prepared by the Wittig reaction of N,N-diethylamidemethylenetriphenylphosphorane ylide with aldehydes with moderate to good yields.
Identification and optimization of piperine analogues as neuroprotective agents for the treatment of Parkinson’s disease via the activation of Nrf2/keap1 pathway
Parkinson's disease (PD) is a slowly progressive and complex neurodegenerative disorder. Up to date, there are no approved drugs that could slow or reverse the neurodegenerative process of PD. Here, we reported the synthesis of series of piperine analogues and the evaluation of their neuroprotective effects against hydrogen peroxide (H2O2) induced damage in the neuron-like PC12 cells. Among these analogues, 3b exhibited the most potent protection effect and its underlying mechanism was further investigated. Further results indicated that the ROS scavenging and cytoprotection effect of 3b might be related to the Nrf2 activation and upregulation of related phase II antioxidant enzymes, such as HO-1 and NQO1. In in vivo study, oral administration (100 mg/kg) of 3b significantly attenuated PD-associated behavioral deficits in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced mouse model of PD and protected tyrosine hydroxylase-immunopositive dopaminergic neurons. Our results provided evidence that 3b might be a promising candidate for Parkinson's disease treatment. (C) 2020 Elsevier Masson SAS. All rights reserved.
An Efficient Catalytic Chromium-Mediated Iodocyclopropanation Reaction: Stereoselective Synthesis of Iodocyclopropanecarboxamides
作者:José M. Concellón、Humberto Rodríguez-Solla、Elena G. Blanco、Santiago García-Granda、and M. Rosario Díaz
DOI:10.1002/adsc.201000574
日期:2011.1.10
catalytic chromium‐mediated novel synthesis of iodocyclopropanecarboxamides is reported. This reaction can be carried out on aromatic (E)‐ or (Z)‐α,β‐unsaturated amides in which the CC double bond is di‐ or trisubstituted. This process takes place with total stereospecificity and the new CI stereogenic center is generated with high stereoselectivity. Some synthetic applications of the obtained iodocyclopropanecarboxamides