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関連する概念動画

Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

5.2K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
5.2K
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

7.3K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
7.3K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.7K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.7K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.2K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
1.2K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
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
2.2K
Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control01:23

Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control

3.4K
The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
3.4K

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Updated: Jan 8, 2026

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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五連鎖ヘテロサイクルによる分子内回転の制御は,細胞浸透性の高いキサンタンベースのフッ素素探査機の設計を容易にする

Shahi Imam Reja1, Yuichiro Hori2, Youhei Takeda3

  • 1Immunology Frontier Research Center (WPI-IFReC), The University of Osaka, Suita, Osaka 565-0871, Japan.

Journal of the American Chemical Society
|December 16, 2025
PubMed
まとめ

研究者はフーランやチオフェンリングを用いた新しいフッ素探査機を開発し,生細胞画像を改良した. これらの探査機は洗浄せずに高い信号対ノイズ比と標的特異性を提供し,EGFRのような細胞プロセスと標的の視覚化を可能にします.

さらに関連する動画

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
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関連する実験動画

Last Updated: Jan 8, 2026

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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Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

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科学分野:

  • 化学生物学
  • 分子イメージング
  • バイオテクノロジー

背景:

  • 素探査機は 敏感で背景のない 生物学的イメージングに不可欠です
  • 既存の探査機は,シグナル対ノイズ比,特異性,および洗浄のないアプリケーションのセル透過性で課題に直面しています.

研究 の 目的:

  • 活体細胞画像の性能を向上させた 新種のフッ素性フッ素素を設計する.
  • 様々なセルラーターゲートとアプリケーションのための汎用的な探査機を開発する.

主な方法:

  • 分子内回転を制御するために,五基のヘテロサイクル (フーラン,チオフェン) をキサンテンの核に組み込む.
  • フラン/チオフェンで置換されたカルボロダミンとシリコン・ロダミン・フッ化物の設計と合成
  • 自己標識タンパク質タグ (HaloTag,SNAPタグ,PYPタグ) とターゲティング阻害剤 (JQ1,ゲフィチニブ/エルロチニブ) の結合.

主要な成果:

  • 制御された分子内回転により,スピロラクトンの均衡から独立した光活性化が達成された.
  • ハロタグ,SNAPタグ,PYPタグの洗浄不可能な高透性プローブを開発し,エンドプラズマ網膜のダイナミクスを可視化しました.
  • EGFRの過剰発現を効果的に検出するBRD4とEGFRターゲティングプローブを作成しました.

結論:

  • ヘテロサイクルの制御された分子内回転に基づく多用途な設計戦略により,革新的なOFF/ONフローロジェニックプローブが得られます.
  • このアプローチは,様々な生物学的標的の選択的,洗浄のない生細胞イメージングのための堅固なプラットフォームを提供します.