エンタルピー制御された核愛性機能化によるピリミジンのC2選択的,機能群異なったアミネーション
Won Seok Ham1,2, Hoonchul Choi1,2, Jianbo Zhang1,2
1Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea.
Journal of the American Chemical Society
|February 9, 2022
まとめ
研究者は,ヘテロアリルアミン,特に2-アミノピリミジンを直接C-H機能化によって合成するための新しい方法を開発した. この突破により 選択的なC2-N結合が形成され 新しい生物活性分子の発見に 極めて重要です
科学分野:
- 有機化学
- 薬剤化学
- 合成化学
背景:
- ヘテロアリルアミンは小分子薬の開発に不可欠です
- 2-アミノピリミジンは多くの生物活性化合物に見られる特権構造である.
- 直接機能化によるピリミジンC2-N結合を導入するための既存の方法は限られている.
研究 の 目的:
- ピリミジンのC-H機能化のための一般的でサイト選択的な合成プラットフォームを開発する.
- ピリミジンのC2位置にアミンの機能を直接導入できるようにする.
- サイトセレクティブのヘテロアリルC-H機能化の範囲を拡大する.
主な方法:
- ピリミディニルイミニウム塩の中間物質を用いた合成プラットフォームの開発.
- C2選択的アミネーションのためのメカニズムベースの反応剤設計.
- 中間物質を様々なアミン製品に in situ 変換する.
主要な成果:
- ピリミジンのC2位置でサイト選択的なC-H機能化を達成した.
- 敏感な機能群を含む様々なピリミジンと互換性が証明されている.
- 選択性の高い複雑なアミノピリミジン合成に成功しました.
結論:
- 開発された方法は,C2-アミナ化ピリミジンへの新しい効率的な経路を提供します.
- このプラットフォームは,サイトセレクティブのヘテロアリルC-H機能化の分野を大幅に前進させています.
- このアプローチは,2-アミノピリミジンモチーフを含む新しい生物活性分子の発見を容易にする.
さらに関連する動画
関連する概念動画
Nucleophilic Aromatic Substitution: Elimination–Addition
4.2K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.2K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)
4.1K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
4.1K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
2.2K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.2K
Diazonium Group Substitution: –OH and –H
2.9K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.9K
Preparation of 1° Amines: Gabriel Synthesis
3.9K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.9K
Preparation of 1° Amines: Azide Synthesis
4.2K
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...
4.2K


