[(PPh<sub>3</sub>)<sub>2</sub>NiCl<sub>2</sub>]-Catalyzed C–N Bond Formation Reaction via Borrowing Hydrogen Strategy: Access to Diverse Secondary Amines and Quinolines
作者:S. N. R. Donthireddy、Vipin K. Pandey、Arnab Rit
DOI:10.1021/acs.joc.1c00510
日期:2021.5.7
mono-N-alkylation of (hetero)aromatic amines, employing alcohols to deliver diverse secondaryamines, including the drug intermediates chloropyramine (5b) and mepyramine (5c), in excellent yields (up to 97%) via the borrowing hydrogen strategy. This method shows a superior activity (TON up to 10000) with a broad substrate scope at a low catalyst loading of 1 mol % and a short reaction time. Further, this strategy
In this study, alkylbenzimidazole-cobalt(II)-catalyzed direct N-alkylation reactions of amines with alcohols derivatives have been investigated undersolvent-free medium. For this purpose, a series of cobalt(II) complexes bearing N-alkylbenzimidazole complexes have been synthesized and novel complexes fully characterized by elemental analysis, FT-IR, 1H NMR and, 13C1H} NMR spectroscopies. Also, the
在这项研究中,已经在无溶剂的介质下研究了烷基苯并咪唑-钴(II)催化的胺与醇衍生物的直接N-烷基化反应。为此目的,已经合成了一系列带有N-烷基苯并咪唑配合物的钴(II)配合物,并且通过元素分析,FT-IR,1 H NMR和13 C 1 H} NMR光谱对新型配合物进行了充分表征。另外,配合物2a的结构已经通过X射线晶体学确认。通常,N-烷基化反应通常在甲苯中与各种金属配合物包括钴一起进行。在该配合物的催化研究中,2a-c在没有溶剂的条件下进行,醇既充当溶剂又充当反应物。相对于甲苯,在无溶剂的中等溶剂中已发现胺产物根据亚胺产物的转化率和对烷基化反应的选择性高。
An Efficient Homogenized Ruthenium(II) Pincer Complex for <i>N</i>
-Monoalkylation of Amines with Alcohols
An ionic 2,6-bis(imidazo[1,2-α]pyridin-2-yl)pyridine-based N^N^N pincer ruthenium(II) complex exhibited high efficiency in the C–N bond formation between amines and alcohols by the “borrowing hydrogen” (BH) or “hydrogen autotransfer” (HA) concept. The synthetic protocol selectively generated monoalkylated amines without formation of tertiary amines during the reaction. The unique selectivity enabled
performed in toluene, the catalytic study of complexes 2a‐d has carried out no additional solvent and alcohol acted both as solvent and reactant of alkylating by using a little excess of alcohols. Surprisingly, conversion and selectivity of amine product for alkylation reaction have been seen high in medium solvent‐free relative to in toluene.
在本文中,已经研究了胺与醇衍生物的直接N烷基化反应。为此,已经合成了带有N配位苯并咪唑配合物的新系列钌(II)配合物,并通过元素分析,FT-IR,1 H NMR和13 C NMR光谱进行了全面表征。此外,配合物2b和2c的结构已通过X射线晶体学确认。尽管N-烷基化反应通常在甲苯中进行,但配合物2a-d的催化研究没有使用额外的溶剂,并且通过使用少量过量的醇,醇既充当溶剂又充当烷基化反应物。令人惊讶的是,与甲苯相比,在无溶剂的中等溶剂中胺产物的烷基化反应转化率和选择性高。
Discovery and development of a novel class of phenoxyacetyl amides as highly potent TRPM8 agonists for use as cooling agents
作者:Alain Noncovich、Chad Priest、Jane Ung、Andrew P. Patron、Guy Servant、Paul Brust、Nicole Servant、Nathan Faber、Hanghui Liu、Nicole S. Gonsalves、Tanya L. Ditschun
DOI:10.1016/j.bmcl.2017.04.003
日期:2017.8
The paper presents the activity trends for a novel series of phenoxyacetyl amides as human TRPM8 receptor agonists. This series encompasses in vitro activity values ranging from the micromolar to the picomolar levels. Sensory evaluation of these molecules highlights their relevance as cooling agents for oral applications. The positive outcome of the complete evaluation of N-(1H-pyrazol-3-yl)-N-(th