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Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

3.1K
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...
3.1K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.8K
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...
3.8K
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

6.4K
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...
6.4K
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

2.7K
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...
2.7K
Structure of Amines01:19

Structure of Amines

2.7K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.7K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

3.1K
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
3.1K

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On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
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On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature

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光駆動結晶化誘発のダイナミック解像度

Jonathan M Meinhardt1, Diane D Kim1, Emily J Wu1

  • 1Department of Chemistry, Princeton University; Princeton, New Jersey 08544, United States.

Journal of the American Chemical Society
|July 14, 2025
PubMed
まとめ

この研究は,光還元触媒と結晶化を用いてキラルアミンエナントオメアを分離する新しい方法を導入している. このアプローチは,ラセミアミンを効率的に分解し,化学合成のための特定のエナチオメールの高収量を生成します.

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Crystallization and Structural Determination of an Enzyme:Substrate Complex by Serial Crystallography in a Versatile Microfluidic Chip
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Crystallization and Structural Determination of an Enzyme:Substrate Complex by Serial Crystallography in a Versatile Microfluidic Chip

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科学分野:

  • 有機化学
  • アシンメトリック・シンセシス
  • カタリシス

背景:

  • チラルアミンは 医薬品や微細化学薬品の重要な構成要素です
  • ラセミアミンのエナティオメール分解のための効率的な方法は,非常に求められています.
  • 既存の方法は厳しい環境や低収量で 制限されることがあります

研究 の 目的:

  • ラセミアミンのダイナミック解像度のための新しい,軽い,効率的な方法を開発する.
  • 触媒光還元媒介によるラセミゼーションとインシット・ディアステロエーマー結晶を組み合わせる.
  • エナチオメリックに純粋なα-キラルアミンへのアクセスのための簡素化されたアプローチを提供する.

主な方法:

  • イリジウム染色体とアキラルチオールコカタリストを用いて,フォトレドックス媒介によるラセミゼーションを行う.
  • カイラル溶解酸による in situ ディアステロエーマー塩の形成を用いる.
  • この方法を様々な二次および三次アミン構造に適用する.

主要な成果:

  • ラセミアミンのダイナミック解離は,温和な,酸化還元中性条件下で成功している.
  • 多様なアミンファミリーに対して,高い収量とエナンチオセレクティビティが得られる.
  • 二次性および三次性α-キラルアミンの間の有用性が実証されている.

結論:

  • 開発された方法は,アミンの動的分解のための効果的な戦略を提供します.
  • このアプローチは,価値あるキラルアミン化合物の準備を簡素化します.
  • 微細化学合成と医薬品開発における広範な応用の可能性