Organic Ligand-Free Alkylation of Amines, Carboxamides, Sulfonamides, and Ketones by Using Alcohols Catalyzed by Heterogeneous Ag/Mo Oxides
作者:Xinjiang Cui、Yan Zhang、Feng Shi、Youquan Deng
DOI:10.1002/chem.201001915
日期:2011.1.17
that is, amines, carboxamides, sulfonamides, and ketones, were successfully synthesized through a borrowing‐hydrogen mechanism. Up to 99 % isolated yields were obtained under relatively mild conditions without additive organic ligand. The catalytic process shows promise for the efficient and economic synthesis of amine, carboxamide, sulfonamide, and ketone derivatives because of the simplicity of the
复杂且昂贵的有机配体通常在制备或工业水平的精细化学合成中必不可少。通过使用不具有添加剂有机配体的非均相催化剂体系来合成精细化学品是非常合乎需要的,但由于它们的通用性差和严格的反应条件而受到严格限制。在这里,我们显示了具有特定Ag 6 Mo 10 O 33的Ag / Mo杂化材料催化形成碳-氮或碳-碳键的结果晶体结构。通过借氢机制成功合成了48种含氮或氧的化合物,即胺,羧酰胺,磺酰胺和酮。在没有添加剂有机配体的条件下,在相对温和的条件下可获得高达99%的分离产率。催化过程显示出胺,羧酰胺,磺酰胺和酮衍生物的高效经济合成的希望,因为该系统简单且易于操作。
Copper-Catalyzed Alkylation of Sulfonamides with Alcohols
作者:Feng Shi、Man Kin Tse、Xinjiang Cui、Dirk Gördes、Dirk Michalik、Kerstin Thurow、Youquan Deng、Matthias Beller
DOI:10.1002/anie.200901510
日期:2009.7.27
Water is the only by‐product in an efficient and atom‐economical Cu(OAc)2‐catalyzed coupling of alcohols with sulfonamides (see proposed mechanism; Ts= p‐toluenesulfonyl). It was discovered that bissulfonylated amidines formed as intermediates when the transhydrogenative CN bond‐forming reaction is carried out in air act as novelligands to stabilize the catalyst.
Facile Amine Formation by Intermolecular Catalytic Amidation of Carbon−Hydrogen Bonds
作者:Manuel R. Fructos、Swiatoslaw Trofimenko、M. Mar Díaz-Requejo、Pedro J. Pérez
DOI:10.1021/ja0627850
日期:2006.9.1
A simple copper-based catalytic system has been developed for the carbon-hydrogen amidation reaction. The copper-homoscorpionate complex Tp(Br3)Cu(NCMe) catalyzes the transfer of the nitrene unit NTs (Ts = p-toluenesulfonyl) and its subsequent insertion into the sp(3) C-H bonds of alkyl aromatic and cyclic ethers or the sp(2) C-H bonds of benzene using PhI=NTs as the nitrene source, affording the corresponding
Fe(II)-catalyzed N-alkylation of sulfonamides with benzylic alcohols
作者:Xinjiang Cui、Feng Shi、Yan Zhang、Youquan Deng
DOI:10.1016/j.tetlet.2010.02.056
日期:2010.4
The FeCl2/K2CO3 catalyst system was developed successfully for the N-alkylation of sulfonamides with benzylicalcohols via borrowing hydrogen method. XPS analysis suggested a possible catalyst cycle between Fe(II) and Fe(0). Under the optimized condition, the scope of the protocol was demonstrated in 21 different alkylation reactions. High yields, in general >90%, are achieved in most cases.
成功开发了FeCl 2 / K 2 CO 3催化剂体系,用于借借氢法将磺酰胺与苄醇进行N-烷基化反应。XPS分析表明,Fe(II)和Fe(0)之间可能存在催化剂循环。在优化的条件下,该方案的范围在21种不同的烷基化反应中得到了证明。在大多数情况下,通常都可以达到90%以上的高收率。