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相关概念视频

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Phosphorylation01:02

Phosphorylation

54.7K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
54.7K
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
17.7K
ATP Energy Storage and Release01:31

ATP Energy Storage and Release

14.8K
ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
14.8K
Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

15.3K
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
15.3K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.3K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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相关实验视频

Updated: Feb 24, 2026

Chemical Triphosphorylation of Oligonucleotides
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Chemical Triphosphorylation of Oligonucleotides

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电化学诱导的序列酸化/循环化 获取酸化的化二二二.

Ya'nan Ran1, Miao Yu1, Shengyu Cui1

  • 1College of Pharmacy, Qiqihar Medical University, Qiqihar, Heilongjiang 161006, People's Republic of China.

ACS omega
|February 23, 2026
PubMed
概括
此摘要是机器生成的。

一种新的电化学方法通过级联反应合成酸化的pyrido-[4,3,2-gh]-phenanthridine衍生物. 这种高效的工艺的产量高达91%,并显示出潜在的抗癌活性.

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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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科学领域:

  • 有机化学 有机化学
  • 电化学 电化学 电化学
  • 药用化学 医学化学

背景情况:

  • 皮里多-[4,3,2-gh]-南氨酸衍生物是重要的异环化合物.
  • 复杂有机分子的高效合成对于药物发现至关重要.
  • 电化学方法提供了可持续和可控的反应途径.

研究的目的:

  • 开发一种新型的电化学合成酸化的pyrido-[4,3,2-gh]-phenanthridine衍生物.
  • 为了研究一个级联酸化/循环化反应机制.
  • 评估合成化合物的初步抗癌活性.

主要方法:

  • 使用Cp2Fe辅助的电化学循环进行合成.
  • 采用了一种级联反应,涉及基添加和化物插入.
  • 进行了针对癌细胞系的初步体外查.

主要成果:

  • 实现了酸化的pyrido-[4,3,2-gh]-phenanthridine衍生物的合成,产量高达91%.
  • 证明了轻度反应条件和广泛的功能组耐受性.
  • 鉴定出具有对特定癌症细胞系有希望的抑制作用的化合物.

结论:

  • 已经建立了一种新且高效的电化学方法来合成酸化的pyrido-[4,3,2-gh]-phenanthridine衍生物.
  • 开发的方法是温和的,对各种功能组具有耐受性,并具有高产率.
  • 合成的化合物具有作为抗癌剂的潜力,需要进一步研究.