Catalytic Enantioselective [3 + 2] Cycloaddition of α-Keto Ester Enolates and Nitrile Oxides
作者:Samuel L. Bartlett、Yoshihiro Sohtome、Daisuke Hashizume、Peter S. White、Miki Sawamura、Jeffrey S. Johnson、Mikiko Sodeoka
DOI:10.1021/jacs.7b03782
日期:2017.6.28
An enantioselective [3 + 2] cycloaddition reaction between nitrileoxides and transiently generated enolates of α-keto esters has been developed. The catalyst system was found to be compatible with in situ nitrile oxide-generation conditions. A versatile array of nitrileoxides and α-keto esters could participate in the cycloaddition, providing novel 5-hydroxy-2-isoxazolines in high chemical yield
The bicyclic isoxazolidine scaffolds are the ubiquitously recurring motifs in alkaloids. Despite of their facile biosynthesises in nature, the laboratory synthesis of these derivatives is still complicated. In this paper, the isoxazolidine derivatives are concisely constructed in one process with excellent stereoselectivity from simple tertiary amines through a C–H activation-retro-aza-Michael-oxidation-cyclization
ORALLY AVAILABLE VIRIDIOFUNGIN DERIVATIVE POSSESSING ANTI-HCV ACTIVITY
申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:US20150210666A1
公开(公告)日:2015-07-30
An object of the present invention is to provide a compound that is useful as an orally available anti-HCV agent. The present invention relates to a compound represented by formula (1) or a pharmaceutically acceptable salt thereof. This compound has an anti-HCV activity and is useful as a medicine.
Orally available viridiofungin derivative possessing anti-HCV activity
申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:US09266853B2
公开(公告)日:2016-02-23
An object of the present invention is to provide a compound that is useful as an orally available anti-HCV agent. The present invention relates to a compound represented by formula (1) or a pharmaceutically acceptable salt thereof. This compound has an anti-HCV activity and is useful as a medicine.
Scandium-Catalyzed Electrochemical Synthesis of α-Pyridinyl Tertiary Amino Acids and Esters
作者:Feng Liu、Weijie Ding、Jiacong Lin、Xu Cheng
DOI:10.1021/acs.orglett.3c02734
日期:2023.10.27
α-Pyridyl tertiaryamino acids have potential pharmaceutical applications because of their structural features. However, their synthesis is still highly limited. Herein, we report a straightforward approach for the electrochemical synthesis of tertiary α-substituted amino acid derivatives via three-component reductive coupling. Using gaseous ammonia as both the N and H source, the α-keto ester reacts
α-吡啶基叔氨基酸由于其结构特征而具有潜在的药物应用。然而,它们的合成仍然非常有限。在此,我们报告了一种通过三组分还原偶联电化学合成叔α-取代氨基酸衍生物的简单方法。使用气态氨作为 N 源和 H 源,α-酮酯直接与 4-CN-吡啶反应。钪催化的应用是实现各种副反应途径化学选择性的关键。