伯胺与亚胺的氧化偶联已通过在近乎环境条件下使用水溶性钴配合物作为催化剂并使用空气作为氧化剂来实现。芳香族,杂芳香族和脂肪族胺已成功转化为相应的亚胺,产率高达96%。用该方法还证明了20克规模的反应,用于从苄胺以高收率合成亚胺。已经发现该催化剂可重复使用多达五个循环。它高效,周转率(TON)高达128,并显示化学选择性,唯一的副产物是水和氨。对照实验和机理研究表明,Co II / Co III催化循环负责这些氧化转化。该反应的一些反应性中间体也已经被分离和结构表征。
Transition metal-free catalytic reduction of primary amides using an abnormal NHC based potassium complex: integrating nucleophilicity with Lewis acidic activation
作者:Mrinal Bhunia、Sumeet Ranjan Sahoo、Arpan Das、Jasimuddin Ahmed、Sreejyothi P.、Swadhin K. Mandal
DOI:10.1039/c9sc05953a
日期:——
potassium complex was used as a transitionmetal-free catalyst for reduction of primary amides to corresponding primary amines under ambient conditions. Only 2 mol% loading of the catalyst exhibits a broad substrate scope including aromatic, aliphatic and heterocyclic primary amides with excellent functional group tolerance. This method was applicable for reduction of chiral amides and utilized for the synthesis
Catalytic Staudinger Reduction at Room Temperature
作者:Danny C. Lenstra、Joris J. Wolf、Jasmin Mecinović
DOI:10.1021/acs.joc.9b00831
日期:2019.5.17
catalytic Staudingerreduction at room temperature that enables the preparation of a structurally diverse set of amines from azides in excellent yields. The reaction is based on the use of catalytic amounts of triphenylphosphine as a phosphine source and diphenyldisiloxane as a reducing agent. Our catalytic Staudingerreduction exhibits a high chemoselectivity, as exemplified by reduction of azides
reported and its catalytic activity towards the reduction of ketones and nitriles is studied. On comparing the reactivity of various other Mn(I) complexes supported by benzimidazole ligand, it was observed that the Mn(I) complexes bearing 6-methylpyridine and benzimidazole fragments exhibited the highest catalytic activity towards monohydrosilylation of ketones and dihydrosilylation of nitriles. Using this
Design and synthesis of highly potent and selective (2-arylcarbamoyl-phenoxy)-acetic acid inhibitors of aldose reductase for treatment of chronic diabetic complications
作者:Michael C. Van Zandt、Evelyn O. Sibley、Erin E. McCann、Kerry J. Combs、Brenda Flam、Diane R. Sawicki、Al Sabetta、Anne Carrington、Janet Sredy、Eduardo Howard、Andre Mitschler、Alberto D. Podjarny
DOI:10.1016/j.bmc.2004.07.062
日期:2004.11
Recent efforts to identify treatments for chronic diabetic complications have resulted in the discovery of a novel series of highly potent and selective (2-arylcarbamoyl-phenoxy)-acetic acidaldosereductaseinhibitors. The compound class features a core template that utilizes an intramolecular hydrogen bond to position the key structural elements of the pharmacophore in a conformation, which promotes
最近鉴定慢性糖尿病并发症的治疗方法的努力导致发现了一系列新的高效和选择性的(2-芳基氨基甲酰基-苯氧基)乙酸醛糖还原酶抑制剂。化合物类别的特征是核心模板,该模板利用分子内氢键将药效基团的关键结构元件定位在构象中,从而促进了高结合亲和力。铅候选物,例如40,5-氟-2-(4-溴-2-氟-苄硫代氨基甲酰基)-苯氧基乙酸,抑制醛糖还原酶,IC(50)为30 nM,而对醛还原酶的活性低1100倍,是一种与活性醛解毒有关的酶。另外,实施例40在4天STZ诱导的糖尿病大鼠模型中以31mg / kg / d po的ED(50)降低了神经山梨糖醇水平。
Synthesis of Molybdenum Pincer Complexes and Their Application in the Catalytic Hydrogenation of Nitriles
series of molybdenum(0), (I) and (II) complexes ligated by different PNP and NNN pincer ligands were synthesized and structurally characterized. Along with previously described Mo−PNP complexes Mo‐1 and Mo‐2, all prepared compounds were tested in the catalytichydrogenation of aromatic nitriles to primary amines. Among the applied catalysts, Mo‐1 is particularly well suited for the hydrogenation of electron‐rich