Si-P,Si-S,Si-N,およびC-C結合にアリンを挿入するための新しい阻害アミド基
Milad Mesgar1, Justin Nguyen-Le1, Olafs Daugulis1
1Department of Chemistry , University of Houston , Houston , Texas 77204-5003 , United States.
Journal of the American Chemical Society
|October 24, 2018
まとめ
新しい阻害されたリチウムアミド基は,Si-P,Si-S,Si-N,およびC-Cを含む様々な結合にアリンを効率的に挿入することを可能にします. この方法はアンスラセンのような複雑な分子に 汎用的な1段階合成を提供します
科学分野:
- 有機化学
- 有機金属化学
背景:
- 複雑な有機分子を合成するのに不可欠です.
- アリンの反応性を制御する新しい反応剤の開発は,合成の進歩にとって不可欠です.
研究 の 目的:
- 新しい阻害されたリチウムアミド基,リチウムダイアマンチラミド (LDAM) を導入する.
- LDAMがアリン挿入反応を促進する有用性を実証する.
- アントラセンの1段階合成を開発する.
主な方法:
- アリルトリフラートとハリドからアリンが生成された.
- 生成されたアリンは,シライライテッド・フォスフィン,硫化物,およびアミンとの挿入反応を受けた.
- アリルハリドとケトンを用いて,アントラセンの1段階合成を達成した.
主要な成果:
- LDAMを使用して,Si-P,Si-S,Si-N,およびC-C結合にアリンを効率的に挿入することが達成されました.
- LDAMベースは,リチウムテトラメチルパイペリド (LiTMP) と比較して,より高い収量を提供しました.
- シアノ,アリル,アルキル,ホルミルを含む様々な機能群は,反応条件と相容れていました.
結論:
- LDAMは,アリン挿入反応のための非常に効果的なベースです.
- LDAMの体積は,ベースとの副作用を最小限に抑え,制限反応剤として使用できます.
- この方法論は多様な有機構造を 構築するための強力なツールです
関連する概念動画
Peptide Bonds
83.0K
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
83.0K
Bond Energies and Bond Lengths
31.5K
Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it.
31.5K
Bonding in Metals
52.4K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.4K
Ionic Bonds
130.8K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
130.8K
Preparation of Amides
4.0K
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...
4.0K
Valence Bond Theory
50.2K
Overview of Valence Bond Theory
50.2K


