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Updated: May 31, 2026
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シラノール:フェノールのPd触媒によるo-アルケニル化のための無痕指向群
Chunhui Huang1, Buddhadeb Chattopadhyay, Vladimir Gevorgyan
1Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, United States.
Journal of the American Chemical Society
|July 20, 2011
まとめ
研究者は,シラノールを指向グループとして使用してフェノールにアルケンを添加する新しいパラジウム触媒反応を開発しました. この方法では,エストロンの誘導体を含む様々なアルケニル化フェノールが効率的に合成されます.
科学分野:
- 有機化学 オーガニック・ケミストリー
- カタリシス カタリシス カタリシス
- 合成方法論 合成方法論
背景:
- フェノールは,有機合成における汎用的な構成要素である.
- 直接的なC-H機能化は,複雑な分子への原子経済的な経路を提供します.
- 地域選択的なC-H活性化には,新しい指揮グループの開発が不可欠です.
研究 の 目的:
- シラノール誘導による新種のフェノルのC-Hアルケニル化について報告する.
- オルトアルケニル化のためのパラジウム ((II)) 触媒化された方法を確立する.
- 様々なアルケニル化フェノールの合成を実証するために.
主な方法:
- シラノールを無痕指向群として利用した.
- C-H活性化のためのパラジウム ((II) 触媒を用いた.
- フェノルのオーソアルケニル化のための反応条件を開発した.
主要な成果:
- アルケニル化フェノールの効率的な合成を達成しました.
- 指揮グループとしてシラノールの有用性を実証した.
- アルケニル化エストロンの微生物を成功して合成した.
結論:
- シラノール誘導のC-Hアルケニル化は,価値あるフェノール化合物への効率的な経路を提供します.
- この方法論は,地域選択的なC-H機能化のためのツールキットを拡張します.
- このアプローチは,生物学的に重要な分子の合成に適用できます.
関連する概念動画
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
02:31Protection of Alcohols
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
02:48Conversion of Alcohols to Alkyl Halides
This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
01:57Preparation of Diols and Pinacol Rearrangement
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.