通过铜催化普罗帕基基氨基化,以丰富的α-四元体α-氨基胺基
Huilai Liu1, Songjie Yu2, Zisong Qi1
1School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China.
Organic letters
|July 4, 2025
概括
这项研究引入了一种新型的铜催化方法,用于合成奇拉胺. 这种新的方法有效地使用易于获得的原材料生产丰富的α-四元胺.
科学领域:
- 有机化学 有机化学
- 不对称的催化剂.
- 合成方法论 合成方法论
背景情况:
- 催化式的enantioselective propargylic amination对于合成性氨基酸至关重要.
- 现有的方法仅限于从不受阻碍的propargylic 产生的N-α-二次性奇拉胺.
研究的目的:
- 开发一种新的铜催化不对称的propargylic amination反应.
- 为了使能够合成具有终端基和氨基基群的基丰富α-四元胺.
主要方法:
- 铜催化不对称的propargylic amination. 铜催化不对称的propargylic amination. 铜催化不对称的propargylic amination. 铜催化不对称的propargylic amination. 铜催化不对称的propargylic amination.
- 作为基质使用了oxazolidine-2,4-diones.
- 采用了温和的反应条件.
主要成果:
- 实现了α-四元胺的高效合成.
- 获得了高产量和反选择性.
- 已经证明了oxazolidine-2,4-diones和aryl amines的广泛基质范围.
结论:
- 开发的方法提供了获取有价值的性α-四元胺的途径.
- 这项工作扩大了不对称的propargylic amination的范围.
- 温和的条件和高选择性使其成为一个实用的合成工具.
相关概念视频
01:22Preparation of 1° Amines: Azide Synthesis
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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...
4.1K
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...
2.7K
01:28Preparation of 1° Amines: Gabriel Synthesis
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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...
3.8K
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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01:30Preparation of Amines: Alkylation of Ammonia and Amines
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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
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01:07Acid Halides to Amides: Aminolysis
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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...
3.1K