Design and Synthesis of Chalcone Derivatives as Inhibitors of the Ferredoxin — Ferredoxin-NADP+ Reductase Interaction of Plasmodium falciparum: Pursuing New Antimalarial Agents
Some chalcones have been designed and synthesized using Claisen-Schmidt reactions as inhibitors of the ferredoxin and ferredoxin-NADP+ reductase interaction to pursue a new selective antimalaria agent. The synthesized compounds exhibited inhibition interactions between PfFd-PfFNR in the range of 10.94%–50%. The three strongest inhibition activities were shown by (E)-1-(4-aminophenyl)-3-(4-methoxyphenyl)prop-2-en-1-one (50%), (E)-1-(4-aminophenyl)-3-(2,4-dimethoxyphenyl)prop-2-en-1-one (38.16%), and (E)-1-(4-aminophenyl)-3-(2,3-dimethoxyphenyl)prop-2-en-1-one (31.58%). From the docking experiments we established that the amino group of the methoxyamino chlacone derivatives plays an important role in the inhibition activity by electrostatic interaction through salt bridges and that it forms more stable and better affinity complexes with FNR than with Fd.
An efficient and green synthesis of novel highly functionalized nitrogen-fused pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine derivatives using recyclable choline hydroxide
作者:Suresh Kumar Krishnammagari、Yeon Tae Jeong
DOI:10.1007/s11164-018-3558-y
日期:2018.12
has been found to be a green and efficient basic ionic liquid catalyst for the synthesis of highly functionalized pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine derivatives through the reaction of a series of α,β-unsaturated ketones with 1H-pyrazolo[3,4-b]pyridin-3-amine under neat conditions. A series of α,β-unsaturated ketones with different substituted functional groups efficiently were converted to their
摘要 已发现胆碱氢氧化物(ChOH)是一种绿色高效的碱性离子液体催化剂,可通过以下反应合成高度官能化的吡啶并[2',3':3,4]吡唑并[1,5- a ]嘧啶衍生物。在纯条件下用1 H-吡唑并[3,4- b ]吡啶-3-胺形成的一系列α,β-不饱和酮。一系列α,β高效地将具有不同取代官能团的不饱和酮转化为相应的产物,分离产率高至优异,反应可轻松放大至几克。本发明对环境无害且可重复使用的ChOH催化剂具有几个优点,例如反应时间更短,官能团耐受性范围广以及通过简单的实验和后处理程序即可获得高产率的产物。 图形概要 该方法的主要特点是绿色反应,操作简便,可重复使用,易操作性强,ChOH效率高。
Continuous-flow hydration–condensation reaction: Synthesis of α,β-unsaturated ketones from alkynes and aldehydes by using a heterogeneous solid acid catalyst
A simple, practical and efficient continuous-flow hydration-condensation protocol was developed for the synthesis of alpha,beta-unsaturated ketones starting from alkynes and aldehydes by employing a heterogeneouscatalyst in a flow microwave. The procedure presents a straightforward and convenient access to valuable differently substituted chalcones and can be applied on multigram scale.
Major anti-inflammatoryagents, steroids and cyclooxygenase, were proved to have serious side effects. Here, a series of chalconederivatives were synthesized and screened for anti-inflammatory activities. QSAR study revealed that the presence of electron-withdrawing groups in B-ring and electron-donating groups in A-ring of chalcones was important for inhibition of LPS-induced IL-6 expression. Further
C3 amino-substituted chalcone derivative with selective adenosine rA1 receptor affinity in the micromolar range
作者:Helena D. Janse van Rensburg、Lesetja J. Legoabe、Gisella Terre’Blanche
DOI:10.1007/s11696-020-01414-9
日期:2021.4
respectively, against rat (r) A1 and A2A ARs. The chalcone derivatives 24, 29, 37 and 38 possessed selective A1 affinity below 10 µM, and thus, are the most active compounds of the present series; compound 38 was the most potent selective A1 AR antagonist (K i (r) = 1.6 µM). The structure-affinity relationships (SAR) revealed that the NH2-group at position C3 of ring A of the chalcone scaffold played a key role
摘要 为了鉴定基于查耳酮支架的新型腺苷受体 (AR) 配体,本文对 33 种查耳酮(15-36 和 37-41)以及结构相关化合物(42-47)进行了合成、表征以及体外和计算机评估。报道称。这些化合物通过放射性配体结合和 GTP 位移测定进行表征,以确定分别针对大鼠 (r) A1 和 A2A AR 的结合亲和力的程度和类型。查尔酮衍生物24、29、37和38具有低于10μM的选择性A1亲和力,因此是本系列中最活跃的化合物;化合物 38 是最有效的选择性 A1 AR 拮抗剂(K i (r) = 1.6 µM)。结构亲和关系(SAR)表明,查耳酮支架的A环C3位上的NH2基团在亲和力中起着关键作用,而且亚苄基环B上的C3'位上的Br原子也起着关键作用。通过计算机评估,新型 C3 氨基取代的查尔酮衍生物 38(包含 α,β-不饱和羰基系统并易于进行结构修饰)可能成为未来药物发现中的合成子。图摘要在亚苄基环