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関連する概念動画

Prochirality02:05

Prochirality

5.2K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
5.2K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.2K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
7.2K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

15.5K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
15.5K
Chirality02:25

Chirality

30.7K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
30.7K
Fischer Projections02:18

Fischer Projections

16.9K
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
16.9K
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

12.2K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
12.2K

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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SuFEx補助基アプローチによる機械的平面キラル分子

Shengtong Niu1, Yingying Jiang1, Darian W Lewis1

  • 1Department of Chemistry, University of Wyoming, Laramie, Wyoming, USA.

Angewandte Chemie (International ed. in English)
|March 2, 2026
PubMed
まとめ
この要約は機械生成です。

本研究では、グラムスケールでの機械的平面キラル（MPC）ロタキサンのための金属フリーSuFExクリック反応を紹介する。エナンチオピュアなMPCロタキサンおよびカテナンが効率的に生成され、以前の合成上の課題を克服する。

キーワード:
SuFExカテナン機械的キラリティ機械的インターロック分子ロタキサン

さらに関連する動画

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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関連する実験動画

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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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科学分野:

  • 立体化学
  • 超分子化学
  • 有機合成

背景:

  • 機械的インターロック分子（MIM）における機械的キラリティは独自の特性を提供するが、合成上のハードルに直面している。
  • 特にスケールでのエナンチオピュアな機械的平面キラル（MPC）分子の製造は、依然として大きな課題である。

研究 の 目的:

  • エナンチオピュアな機械的平面キラル（MPC）分子のためのスケーラブルで金属フリーな合成ルートを開発すること。
  • MPCロタキサンおよびカテナン合成のために硫黄（VI）フッ化物交換（SuFEx）クリック反応を活用すること。

主な方法:

  • MPCロタキサン合成のための活性テンプレートとしてSuFExクリック反応を採用すること。
  • 高いエナンチオ純度（ee >99%）を達成するための、1段階の補助基除去（スルフィニル基の除去または酸化）を利用すること。
  • ロタキサンの多様な官能基化およびその後のカテナンへの変換のための誘導体合成戦略の開発。

主要な成果:

  • 金属フリーSuFExアプローチを用いたMPCロタキサンの成功したグラムスケール合成。
  • 高いエナンチオマー過剰率でエナンチオピュアなMPCロタキサンおよび高次構造の効率的な生成。
  • キラリティを保持したエナンチオピュアMPCロタキサンへのエナンチオピュアMPCロタキサンの変換の実証。

結論:

  • SuFExクリック反応は、エナンチオピュアな機械的平面キラル分子にアクセスするための堅牢でスケーラブルな方法を提供する。
  • この戦略は、ロタキサンおよびカテナンを含む複雑なキラル機械的インターロック分子の合成を大きく進歩させる。
  • 開発された方法論は、キラルMIMの応用を探求するための新しい道を開く。