Rational design, synthesis and in vitro evaluation of allylidene hydrazinecarboximidamide derivatives as BACE-1 inhibitors
摘要:
BACE-1 (beta-secretase) is considered to be one of the promising targets for treatment of Alzheimer's disease as it catalyzes the rate limiting step of A beta-42 production. Herein, we report a novel class of allylidene hydrazinecarboximidamide derivatives as moderately potent BACE-1 inhibitors, having aminoguanidine substitution on allyl linker with two aromatic groups on either side. A library of derivatives was designed based on the docking studies, synthesized and evaluated for BACE-1 inhibition in vitro. The designed ligands displayed interactions with the catalytic aspartate dyad through guanidinium functionality. Further, the aromatic rings placed on either side of the linker occupied S1 and S3 active site regions contributing to the activity. These ligands were also predicted to follow Lipinski rule and cross blood brain barrier. Compound 2.21, having high docking score, was found to be most active with IC50 of 6.423 mu M indicating good correlation with docking prediction. (C) 2015 Elsevier Ltd. All rights reserved.
Lithium hydroxide mediated synthesis of 3,4-disubstituted pyrroles
作者:Ratnesh Sharma、Kapil Kumar、Mangilal Chouhan、Vikas Grover、Vipin A. Nair
DOI:10.1039/c3ra42569j
日期:——
LiOH·H2O in ethanol was found to be an effective reagent for the synthesis of 3,4-disubstituted pyrrole derivatives by the van Leusen method. In situ formation of chalcones from aromatic aldehydes and enolisable ketones, and their subsequent reaction with tosylmethyl isocyanide resulted in the formation and precipitation of pyrrole derivatives from the reaction medium, in good yields. The solvation effect of the polar medium facilitates the reaction.
A boron–nitrogen transborylation enabled, borane-catalysed reductive cyanation of enones
作者:Kieran Benn、Kieran Nicholson、Thomas Langer、Stephen P. Thomas
DOI:10.1039/d1cc03649a
日期:——
introduction of a nitrile group into organic molecules and an orthogonal route for the installation of a wide array of functional groups using simple transformations. Cyanation methods are dominated by transition metal catalysis and the use of hydrogen cyanide gas. Here, the electrophilic cyanation of enones was achieved using a main-group catalyst and a non-toxic, electrophilic cyanide source. This protocol
氰化提供了一种将腈基引入有机分子的简单方法,以及使用简单转化安装各种官能团的正交途径。氰化方法主要是过渡金属催化和使用氰化氢气体。在这里,烯酮的亲电氰化是使用主基催化剂和无毒的亲电氰化物源实现的。该协议适用于广泛的底物范围,包括那些含有可还原官能团的底物。机理研究表明,氨基硼烷中间体经过 B-N 转移(B -N / B- H 交换)以实现催化转化。