C-LABELED AMIDES の生産 "イン・ループ" による C-CARBONYLATION
Tanpreet Kaur1, Xia Shao1, Allen F Brooks1
1Division of Nuclear Medicine, Department of Radiology, The University of Michigan Medical School, Ann Arbor, Michigan 48109, United States.
Asian journal of organic chemistry
|August 26, 2025
まとめ
この研究では,新しいPET放射性トレーサの開発に不可欠な,炭素11でラベル付けされたベンザミドを作成するための自動化された方法が紹介されています. 改善された合成経路は,分子画像の研究に多岐にわたるツールを提供します.
科学分野:
- 放射化学
- 分子イメージング
- 有機合成
背景:
- ベンザミドは生物活性分子に多く存在し,ポジトロン放出トモグラフィー (PET) の放射性トレーサを開発するための有望な支架となっています.
- 炭素11 (11C) のラベリングは,その短い半減期と好ましい腐敗特性のために,PETイメージングに不可欠です.
研究 の 目的:
- Cラベル付ベンザミドを製造するための改良された自動合成経路を確立する.
- 既知のPETイメージング剤を合成して,その方法の多用途性を実証する.
主な方法:
- アリルハライドとC"の炭素結合を用いた.
- 電子性アロイル二メチラミノピリジニウム塩を中間物質として使用している.
- GE TRACERLab FXの自動化放射化学合成モジュールを使用しています.
主要な成果:
- KORアンタゴニスト [11C]LY2795050を含むベンザミドを含む様々な化合物を合成しました.
- 合成されたCラベル付ベンザミドは,中等から優れた放射化学的産出率を達成した.
- C-ベンザミド合成のための実用的で自動化されたアプローチを示した.
結論:
- 開発された自動化された方法は,一次C-ベンザミドを合成するための実用的な手段を提供します.
- この方法論は,PETトレーサー開発と分子イメージングにおける将来のアプリケーションのための舞台を設定します.
- この多用途なツールは,PETイメージングのためのCラベル付き化合物の生成を促進し,生物学的過程の理解に新しい道を開きます.
![Technical Aspect of the Automated Synthesis and Real-Time Kinetic Evaluation of [11C]SNAP-7941](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59557.jpg&w=3840&q=50)
関連する概念動画
01:29Preparation of Amides
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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
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01:19Amines to Amides: Acylation of Amines
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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
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01:28Amides to Carboxylic Acids: Hydrolysis
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Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions.
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
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01:22Preparation of 1° Amines: Azide Synthesis
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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...
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01:07Acid Halides to Amides: Aminolysis
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01:26Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism
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