Asymmetric Alkynylation of β-Ketoesters and Naphthols Promoted by New Chiral Biphenylic Iodanes
作者:Simon Companys、Philippe A. Peixoto、Cyril Bosset、Stefan Chassaing、Karinne Miqueu、Jean-Marc Sotiropoulos、Laurent Pouységu、Stéphane Quideau
DOI:10.1002/chem.201703238
日期:2017.9.27
The preparation of new chiral biphenylic λ3‐iodane reagents bearing transferable alkynyl ligands is described. These reagents transfer their carbon‐based ligands onto β‐ketoesters with an enantiomericexcess (ee) up to 68 %, and most remarkably, enable the dearomative alkynylation of naphthols in good to high yields up to 84 % ee.
Bromodomain and extra‐terminal domain (BET) inhibitors are widely used both as chemical tools to study the biological role of their targets in living organisms and as candidates for drug development against several cancer variants and human disorders. However, non‐BETbromodomains such as those in p300 and CBP are less studied. XDM‐CBP is a highly potent and selectiveinhibitor for the bromodomains
The Baeyer-Villiger Oxidation of Aromatic Aldehydes and Ketones with Hydrogen Peroxide Catalyzed by Selenium Compounds. A Convenient Method for the Preparation of Phenols
作者:Ludwik Syper
DOI:10.1055/s-1989-27183
日期:——
A series of organoselenium compounds was investigated as activators of hydrogen peroxide in the Baeyer-Villiger oxidation. As a result, a convenient and cheap method for transformation of aromatic aldehydes, having polycondensed ring systems or electron-donating substituents, and polymethoxy derivatives of acetophenone, into phenols was elaborated. This method utilizes hydrogen peroxide activated by areneseleninic acids, as oxidizing agent.
Central-to-axial chirality transfer via C–N single bond oxidation was first achieved as a versatile and conceptually distinct strategy to prepare a new family of axiallychiral heteroaromatic biaryl backbones and P,N-ligands (named as Quinoxalinaps) in gram scale. Two atropisomers of Quinoxalinaps (ee >99%) were readily accessed from the same precursor enantiomer by a simple dehydrogenative oxidation
The frame rearrangement reaction of dinaphthyl ketones, possessing hydroxy groups at appropriate positions, into phenalenone derivatives under acidic conditions was discovered serendipitously. Although this rearrangement had limited scope, its mechanism was unusual, involving the division of naphthalene rings into one phenalenone ring and one benzene ring. The reaction mechanism was elucidated by direct
偶然发现了在酸性条件下在适当位置具有羟基的二萘甲酮向苯丙烯酮衍生物的骨架重排反应。尽管这种重排的范围有限,但是其机理却很不寻常,涉及将萘环分为一个菲拉烯酮环和一个苯环。通过使用1 H NMR测量直接确定中间结构来阐明反应机理。预计生成的非对苯二酚是天然产物和功能材料的关键中间体。