相关实验视频
Updated: Jul 15, 2025

05:07
Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
Published on: June 23, 2019
6.7K
芳胺的部分合成:它们的抗尿酶潜力和对接研究
Patricia Akpomedaye Onocha1, Ejike Onwudiegwu Okpala2, Muhammad Shaiq Ali3
1Natural Products/Medicinal Chemistry Unit, Department of Chemistry, University of Ibadan, Ibadan, Nigeria.
Journal of biomolecular structure & dynamics
|October 3, 2023
概括
来自Celtis zenkeri的芳香胺衍生物显示出强大的抗尿素酶活性. 乙化产品 (1e) 显示出显著的抑制,这表明对抗尿酸酶的药物发现具有治疗潜力.
科学领域:
- 自然产品化学 自然产品化学
- 药用化学 医学化学
- 酶抑制可以抑制酶.
背景情况:
- 尿素是各种病原体的关键毒性因素,也是治疗干预的目标.
- 天然产品,如芳胺,是潜在的酶抑制剂的丰富来源.
- 塞尔蒂斯克里 (Celtis zenkeri) 的茎皮是生物活性化合物的潜在来源.
研究的目的:
- 从Celtis zenkeri中分离和鉴定N-p-trans-coumaroyltyramine (1) 的特征.
- 合成和评估新的衍生品 (1a-d) 和已知的衍生品 (1e) 对抗尿酶活性.
- 为了研究活性化合物与尿酶的分子相互作用和稳定性.
主要方法:
- 对N-p-trans-coumaroyltyramine的分离和光谱表征 (1).
- 衍生物 (1a-e) 的合成和光谱表征.
- 在体外抗尿酶查,IC50测定,分子对接,MM-GBSA和分子动态模拟.
主要成果:
- N-p-trans-coumaroyltyramine (1) 被从Celtis zenkeri.com中分离出来,可以作为一种药物.
- 乙化衍生物 (1e) 显示出最强的尿素酶抑制 (IC50 = 19.5 ± 0.23 μM),超过了标准的氨酸.
- 分子模拟证实了化合物 (1b-e) 与关键尿酶残留物的稳定相互作用,这表明阻断基质进入的机制.
结论:
- N-p-trans-coumaroyltyramine衍生物 (1b-e) 是有效的尿酶抑制剂.
- 乙化产品 (1e) 显示出有前途的治疗潜力.
- 这些化合物需要进一步进行临床前研究,以发现抗尿酶相关疾病的药物.
相关概念视频
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview
3.2K
In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
3.2K
Basicity of Heterocyclic Aromatic Amines
6.1K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.1K
Preparation of Amides
3.1K
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
3.1K
Preparation of 1° Amines: Azide Synthesis
4.0K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.0K
Basicity of Aromatic Amines
7.2K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
7.2K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism
3.5K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
3.5K

