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関連する概念動画

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

9.8K
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.
9.8K
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

3.8K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
3.8K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.6K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.6K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

10.1K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
10.1K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.2K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.2K
Sharpless Epoxidation02:57

Sharpless Epoxidation

3.8K
The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
3.8K

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関連する実験動画

Updated: Jun 5, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Published on: February 7, 2019

6.9K

非対称的移動性ツジ・ワッカー酸化は,ヘテロ・およびイソステル・ダイアルメタンのエナチオセレクティブ合成を可能にします.

Eduard Frank1, Sooyoung Park1, Elias Harrer1

  • 1Institute for Organic Chemistry, University of Regensburg, 93053 Regensburg, Germany.

Journal of the American Chemical Society
|December 7, 2024
PubMed
まとめ
この要約は機械生成です。

この研究は,薬剤設計に不可欠なキラルダイアリルメタンを作るための新しい方法を示しています. 非対称な移動型ツジ・ワッカー酸化は,これらの複雑な分子を合成する効率的な経路を提供します.

さらに関連する動画

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Published on: February 6, 2019

6.8K
Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

Published on: June 13, 2022

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関連する実験動画

Last Updated: Jun 5, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
10:17

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Published on: February 7, 2019

6.9K
Solid-phase Synthesis of [4.4] Spirocyclic Oximes
05:15

Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Published on: February 6, 2019

6.8K
Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
11:04

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

Published on: June 13, 2022

2.9K

科学分野:

  • 有機化学
  • カタリシス
  • 薬剤化学

背景:

  • ダイアリルメタンは強力な薬剤の重要なキラル構成要素ですが,特にイソステルアレンとの合成は困難です.
  • ステレオセレクティブ・ダイアリルメタン合成のための既存の方法は,しばしば複数のステップとリドックス操作を必要とし,効率に影響を与えます.
  • イソステルアレンをキラルメタン基板に組み込むのは,触媒の区別がつかないため難しい.

研究 の 目的:

  • キラル・ディアリルメタンの一般的なエナチオセレクティブ合成を開発する.
  • 同位体 (ヘテロ) アレンの組み込みに関連する合成の課題を克服する.
  • 既存の方法よりステップ・アンド・レドックス・エコノミックな代替手段を提供すること.

主な方法:

  • 単純なスティルベンの非対称移動型ツジ・ワッカー酸化.
  • エアロビック・フォトレドックスとセレニウムπ酸の触媒を組み合わせた多触媒システム.
  • 立体的に同位体である起始材料を用いて,ステレオダイバージェント合成を行う.

主要な成果:

  • メタンの核に 挑戦的なイソステリックを含む様々なアレンの 設置を成功させました
  • エナチオセレクティビティは最高97%に達した.
  • ネボノジンのような抗ヒスタミン化合物の 迅速な合成に有用性が示された.

結論:

  • 開発されたプロトコルは,キラル・ディアリルメタンを合成するための効率的で汎用的なプラットフォームを提供します.
  • セレニウム触媒は顔の分化と地域選択性を制御し,ステレオダイバーゲント合成を可能にします.
  • この方法は薬の発見と開発,特に抗ヒスタミンのための貴重なツールを提供します.