<i>N</i>-Alkylation of organonitrogen compounds catalyzed by methylene-linked bis-NHC half-sandwich ruthenium complexes
作者:Zakaria Moutaoukil、Emmanuel Serrano-Díez、Isidro G. Collado、Manuel Jiménez-Tenorio、José Manuel Botubol-Ares
DOI:10.1039/d1ob02214h
日期:——
An efficient ruthenium-catalyzed N-alkylation of amines, amides and sulfonamides has been developed employing novel pentamethylcyclopentadienylruthenium(II) complexes bearing the methylene linked bis(NHC) ligand bis(3-methylimidazol-2-ylidene)methane. The acetonitrile complex 2 has proven particularly effective with a broad range of substrates with low catalyst loading (0.1–2.5 mol%) and high functional
Copper-Catalyzed<i>N</i>-Alkylation of Sulfonamides with Benzylic Alcohols: Catalysis and Mechanistic Studies
作者:Xinjiang Cui、Feng Shi、Man Kin Tse、Dirk Gördes、Kerstin Thurow、Matthias Beller、Youquan Deng
DOI:10.1002/adsc.200900490
日期:2009.11
N-alkylation of sulfonamides with alcohols is efficiently performed in the presence of easily available coppercatalysts via hydrogen borrowing methodology. Applying a copper acetate/potassium carbonate system the reaction of sulfonamides and alcohols gave the corresponding secondary amines in excellent yield. In situ HR-MS analysis indicated that bissulfonylated amines are formed under air atmosphere
在容易获得的铜催化剂存在下,通过氢借用方法可有效地进行磺酰胺与醇的N-烷基化反应。采用乙酸铜/碳酸钾体系,磺酰胺和醇的反应以优异的产率得到了相应的仲胺。原位HR-MS分析表明,双磺酰化胺是在空气气氛下形成的,可作为催化体系的自稳定配体。紫外可见测量表明,铜中心与双磺酰化胺之间存在相互作用。苄醇-d 7与对甲苯磺酰胺,N-苄基-p的反应-甲苯磺酰胺或N-亚苄基棉烯磺酰胺表明反应是通过转移氢化机理进行的,整个过程是微可逆的。苄醇和苄醇的竞争反应d 7与p(-toluenesulfonamide揭示了动力学同位素效应ķ / H ķ的3.287(0.192)为苯甲醇的脱氢和0.611(0.033)为氢化d)ñ -亚苄基-对-甲苯磺酰胺中间体,这表明醇的脱氢是决定速率的步骤。
Synthesis and Evaluation of 2-Alkylthio-4-(<i>N</i>-substituted sulfonamide)pyrimidine Hydroxamic Acids as Anti-myeloma Agents
A series of pyrimidine hydroxamic acids with a sulfide substituent at the second position and a sulfonamide substituent at the fourth position have been synthesized and evaluated for their activity against human myeloma cell line RPMI 8226. Several compounds exhibited significant anti-cancer potency. It was found that representative compound 6a selectively killed cancerous but not normal cells. Moreover
Combining Organometallic Reagents, the Sulfur Dioxide Surrogate DABSO, and Amines: A One-Pot Preparation of Sulfonamides, Amenable to Array Synthesis
作者:Alex S. Deeming、Claire J. Russell、Michael C. Willis
DOI:10.1002/anie.201409283
日期:2015.1.19
describe a method for the synthesis of sulfonamides through the combination of an organometallicreagent, a sulfurdioxide equivalent, and an aqueous solution of an amine under oxidative conditions (bleach). This simple reaction protocol avoids the need to employ sulfonyl chloride substrates, thus removing the limitation imposed by the commercial availability of these reagents. The resultant method allows