機能化されたペプチドミメティックスを構築する: N-アシリミニウムイオンをペプチドに導入するための電気補助物の使用
Haizhou Sun1, Connor Martin, David Kesselring
1Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA.
Journal of the American Chemical Society
|October 19, 2006
まとめ
研究者らは,シリル代替アミノ酸を合成して,ペプチドに活性なN-アシリミニウムイオンを生成しました. この方法は,固相基板と機能化されたダイペプチドで実証され,より広範なアプリケーションの限界を定義しました.
科学分野:
- 有機化学 オーガニック・ケミストリー
- ペプチド化学 ペプチド化学
- 合成方法論 合成方法論
背景:
- N-アシリミニウムイオンは,汎用性の高い合成中間物質である.
- シリル基は,反応性中間物質を安定させることができる.
- ペプチドの機能化は,薬剤開発と材料科学において極めて重要です.
研究 の 目的:
- シリルで置換されたアミノ酸を使用してN-アシリミニウムイオンを生成するための新しい方法を開発する.
- 固相ペプチド合成におけるこの方法の有用性を探求する.
- ペプチドにおけるシリルアシストされたN-アシリミニウムイオン生成の範囲と限界を評価する.
主な方法:
- シリル代替アミノ酸の合成.
- これらのアミノ酸をペプチド配列に組み込む.
- N-アシリミニウムイオンの酸化生成は,電気化学的および化学的方法によって行われます.
- 固相合成とダイペプチドライブラリへの応用.
主要な成果:
- シリルで置換されたアミノ酸の合成とペプチドの組み込みが成功しました.
- 溶液と固体相の両方でN-アシリミニウムイオンの酸化生成が実証されています.
- 機能化されたダイペプチドの小さなライブラリへの成功アプリケーション.
- シリル群の電子提供能力と,より長いペプチドにおける互換性に関する定義された制限.
結論:
- シリルで置換されたアミノ酸は,活性なN-アシリミニウムイオンを生成するための効果的な前駆体として機能します.
- 開発された方法論は,固相ペプチド合成に適用できます.
- 限界を理解することは,ペプチド改変と薬物開発における将来のアプリケーションを最適化するための鍵です.
関連する概念動画
01:07Acid Halides to Amides: Aminolysis
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
01:29Preparation of Amides
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...
01:28Amides to Carboxylic Acids: Hydrolysis
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...
01:19Amines to Amides: Acylation of Amines
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 amide...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
01:23Aldehydes and Ketones with Amines: Imine Formation Mechanism
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
01:28Preparation of 1° Amines: Gabriel Synthesis
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...