関連する実験動画
Updated: Sep 9, 2025
![Solid-phase Synthesis of [4.4] Spirocyclic Oximes](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F58508.jpg&w=3840&q=50)
05:15
Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
6.9K
単段階反応と多段階計画との逆合成クロストラック
Junseok Choe1, Hajung Kim1, Yan Ting Chok1
1Department of Computer Science, Korea University, Seoul, South Korea.
Journal of cheminformatics
|August 28, 2025
まとめ
多段階のレトロ合成経路の生成は困難です この研究では 単一段階のレトロシンセシスモデルと 計画アルゴリズムを統合し 最良の解明性が 薬剤発見の経路の実現性を保証しないことを発見しました
科学分野:
- コンピュータ化学
- 有機合成
- 化学における機械学習
背景:
- 薬や材料の設計には 逆合成が不可欠です
- 現在の機械学習モデルは 一段階の予測に優れているが 多段階の経路生成には苦労しています
- 多段階の効率的なレトロ合成戦略の開発は依然として大きな課題です.
研究 の 目的:
- 一段階の予測モデルと計画アルゴリズムを統合することで,多段階の逆合成経路生成を改善する.
- 計画アルゴリズムと単一ステップモデルのさまざまな組み合わせを包括的に評価する.
- 溶解性と実用的な研究室の可行性の両方に基づいて合成経路を評価する.
主な方法:
- 多様なデータセットと計画アルゴリズムの組み合わせを単段階のレトロシンセシスモデルで探求する.
- 異なるモデルとアルゴリズムのペアリングを体系的に分析する.
- 解決性 (完全性) と実行性 (実用性) のメトリックを用いて生成されたルートの評価.
主要な成果:
- 解決可能性が最も高いモデルとアルゴリズムの組み合わせは,一貫して最も実行可能な経路を生成しなかった.
- 経路の完全性と実験室での適用性を考慮して,微妙な評価方法が必要である.
- 性能は異なるデータセットとメトリックの組み合わせによって大きく変化した.
結論:
- 計画アルゴリズムと単段階のレトロシンセシスモデルを統合することで,多段階の経路生成の改善への道が開けます.
- この研究は,計算効率 (解決可能性) と実用的な実験実行 (実現可能性) のバランスを取る必要性を強調しています.
- これらの発見は,計算によるレトロシンセシスの理解と,化学合成におけるその実用性の理解を進める.
関連する概念動画
Multi-Step Reactions
7.5K
Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
7.5K
SN2 Reaction: Stereochemistry
9.8K
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...
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.8K
Cycloaddition Reactions: Overview
2.8K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.8K
Crossed Aldol Reactions: Overview
5.6K
Crossed aldol addition is the reaction between two different carbonyl compounds under acidic or basic conditions. Here, both the carbonyl compounds function as nucleophiles and electrophiles. As shown in Figure 1, such a reaction yields a mixture of products, two of which are formed via self-condensation, while the remaining two are formed via crossed-condensation. Without adjustment, the reaction's usefulness in organic chemistry is decreased.
5.6K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility
3.3K
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...
3.3K
SN1 Reaction: Stereochemistry
8.9K
This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
8.9K

