从海绵中提取的海洋生物碱具有多种生物活性和潜在的药用价值。吡咯衍生的板层素类生物碱,尤其是它们的过甲基衍生物,表现出低细胞毒性和强大的 MDR 逆转活性。Neolamellarin A 是一种从海洋动物海绵中提取的新型片层状生物碱。2015年,我们报道了全甲基化新层胺A及其衍生物的合成方法。2018年,我们报道了3,4-双芳基-N-烷基化全甲基化新层胺A衍生物的合成及其在PC12细胞中的神经保护活性。在本报告中,另一个系列 15 种不同的 3,4-双芳基-N合成了α-酰化全甲基化新层胺A衍生物,并对这些化合物对谷氨酸诱导的PC12细胞凋亡的突出保护作用进行了介绍和讨论。这些具有低细胞毒性和优越的神经保护活性的新层胺 A 衍生物可能有可能被开发成对抗谷氨酸诱导的神经细胞凋亡的拮抗剂。
Synthesis and evaluation of aminopyridine derivatives as potential BACE1 inhibitors
摘要:
To identify a new non-peptidyl BACE1 inhibitor, we focused on the aminopyridine structure, which binds to the active sites of BACE1. Synthesis of aminopyridine derivatives and evaluation of inhibitory activity against rBACE1 are described. The 2-aminopyridine moiety and/or 3-methoxybenzaldehyde could be converted to terminal acetylene derivatives by the Sonogashira method. Sonogashira or Glaser cross-coupling reactions with the corresponding derivatives followed by hydrogenation could derive the designed compounds. Although inhibitory activities of the synthetic compounds against rBACE1 were weak, the aminopyridine motif has potential as a BACE1 inhibitor. (C) 2015 Elsevier Ltd. All rights reserved.
A nickel‐catalyzed alkylation of polycyclic aromatic methyl ethers as well as methyl enol ethers with B‐alkyl 9‐BBN and trialkylborane reagents that involves the cleavage of stable C(sp2)−OMe bonds is described. The transformation has a wide substrate scope and good chemoselectivity profile while proceeding under mild reaction conditions; it provides a versatile way to form C(sp2)−C(sp3) bonds that
A nickel-catalyzed cross-coupling of alkenyl methyl ethers with Grignard reagents, undermildconditions, is described. These conditions allowed access to various stilbenes and heterocyclic stilbenic derivatives as well as to a potential anticancer agent DMU-212.
Hypervalent Iodine(III)-Mediated Cascade Cyclization of Propargylguanidines and Total Syntheses of Kealiinine B and C
作者:Guilong Tian、Pavel Fedoseev、Erik V. Van der Eycken
DOI:10.1002/chem.201700934
日期:2017.4.19
An oxidative cascadecyclization of propargylguanidines promoted by phenyliodonium diacetate (PIDA) was developed. The protocol provides an efficient route for the synthesis of the alkaloids kealiininesB and C as well as homologues. The difference in the electronic nature of the acetylene substituent resulted in two ways of the cyclization. A plausible mechanism is proposed based on the experimental
Methods for the synthesis of phenylacetaldehydes (oxidation, one-carbon chain extension) were compared by using the synthesis of 4-methoxyphenylacetaldehyde as a model example. Oxidations of 4-methoxyphenylethanol with activated DMSO (Swern oxidation) or manganese dioxide gave unsatisfactory results; whereas oxidation with 2-iodoxybenzoic acid (IBX) produced 4-methoxyphenylacetaldehyde in reasonable
Palladium-catalyzed synthesis of α-aryl acetophenones from styryl ethers and aryl diazonium salts <i>via</i> regioselective Heck arylation at room temperature
作者:Rapelly Venkatesh、Adesh Kumar Singh、Yong Rok Lee、Jeyakumar Kandasamy
DOI:10.1039/d1ob01503f
日期:——
Preparation of α-aryl acetophenones from styryl ethers and aryldiazonium salts is described. The reaction is catalyzed by palladium acetate at roomtemperature in the absence of ligand and base. The developed method is highly attractive in terms of reaction conditions, substrate scope, functional group tolerance and yields. Synthetic applications of the present method are demonstrated by preparing