アルケンの触媒的な二酸化ステレオおよびエナチオ選択的フッ素アミネーション
Katrina M Mennie1, Steven M Banik1, Elaine C Reichert1
1Department of Chemistry & Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , United States.
Journal of the American Chemical Society
|March 28, 2018
まとめ
この研究では,触媒を用いたキラル・フッ素化ビルディングブロックを合成する新しい方法が報告されています. このアプローチは,薬剤発見のための価値あるフッ素有機化合物への高度な選択的なアクセスを提供します.
科学分野:
- 有機化学
- 非対称合成
- 化化学
背景:
- チラルのフッ素有機化合物は,医薬品化学における重要な構成要素です.
- 合成のための効率的でステレオ選択的な方法の開発は,依然として大きな課題です.
研究 の 目的:
- syn-β-fluoroaziridine誘導体のステレオ選択的合成のための新しい触媒システムを開発する.
- 複数のステレオセンターを持つ他のフッ素化合物へのアクセスのためのこの方法の有用性を調査する.
主な方法:
- HF-ピリジンとmCPBAを用いたアリルアミンのキラルアリルヨウ素触媒による化.
- 複合フッ素アミンの合成のために,触媒制御されたダイアステレオ選択性を利用する.
- 開発された方法を様々なアルケンの基板に適用する.
主要な成果:
- シン-β-フッ素アジリジンの合成における高ダイアステレオ選択性およびエナチオ選択性.
- 連続した3つのステレオセンターを持つ1,3-difluoro-2-aminesのエンアンチオ濃縮の成功.
- 様々な基板から抗β-フッ素ピロリジンと1,2-オキシフッ素化製品へのアクセス
結論:
- 開発されたキラルアリルヨウ素触媒は,有価なフッ素有機基の効率的なステレオ選択合成を可能にします.
- この方法は,複数のステレオセンターを持つ複雑なフッ素分子にアクセスするための広範な適用性を提供します.
- この研究は,フッ素化医薬品と農薬の合成のための強力なツールを提供します.
関連する概念動画
Reduction of Alkenes: Catalytic Hydrogenation
14.2K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
14.2K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.9K
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...
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...
3.9K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.1K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
9.1K
Turnover Number and Catalytic Efficiency
21.7K
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
21.7K
Catalytically Perfect Enzymes
5.2K
The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
Most enzymes...
Most enzymes...
5.2K
Nomenclature of Alkenes
16.0K
The IUPAC naming system for alkenes replaces -an- with -en- in the corresponding parent alkanes. Accordingly, a simple alkene replaces the -ane suffix of the alkane with -ene.
As per the IUPAC rules, the longest carbon chain containing the maximum number of double bonds is identified as the parent chain and is numbered such that the doubly bonded carbon atoms receive the lowest possible numbers. The location of the double bond is indicated by the number of its first carbon atom. In branched...
As per the IUPAC rules, the longest carbon chain containing the maximum number of double bonds is identified as the parent chain and is numbered such that the doubly bonded carbon atoms receive the lowest possible numbers. The location of the double bond is indicated by the number of its first carbon atom. In branched...
16.0K


