第一个利用酰亚胺自由基的催化策略已经开发出来。这种方法可以通过光催化还原烯丙醇的肟酰亚胺酯来实现烯丙醇的烯烃双官能化。随后的亚氨酸酯自由基经历连续的分子内和分子间反应,通过三种不同的自由基机制提供(i)氢胺化、(ii)氨基烷基化或(iii)氨基芳基化。介绍了这种亚胺酯自由基反应催化方法的广泛范围和实用性,以及与其他 N 中心自由基和互补的闭壳亚胺酯途径的比较。
Nickel catalyzed decyanation of aryl and aliphatic cyanides with hydrosilane as the hydride source has been developed. This method is easy to handle, scalable and can be carried out without a glove box. The method has been applied in the cyanide directed functionalization reaction and α-substitution of benzyl cyanide.
New methodology for the synthesis of variously substituted 2-oxazolines and one dihydrooxazine using aldehydes, amino alcohols, and N-bromosuccinimide as an oxidizing agent is described. This one-pot synthesis is characterized by mild reaction conditions, broad scope, high yields, and its preparative simplicity.
Copper <i>N</i>-Heterocyclic Carbene Complexes As Active Catalysts for the Synthesis of 2-Substituted Oxazolines from Nitriles and Aminoalcohols
作者:Michael Trose、Faïma Lazreg、Mathieu Lesieur、Catherine S. J. Cazin
DOI:10.1021/acs.joc.5b01382
日期:2015.10.16
The reaction between nitriles and aminoalcohols to access 2-substituted oxazolines was investigated. Using copper–NHC complexes, various nitriles were successfully converted into the corresponding oxazolines, under milder and less wasteful conditions than those of previously reported methods.
Transition metal and base free synthesis of 2-aryl-2-oxazolines from aldehydes and β-amino alcohols catalysed by potassium iodide
作者:C. Uma Maheswari、G. Sathish Kumar、M. Venkateshwar
DOI:10.1039/c4ra08578g
日期:——
Synthesis of 2-aryl-2-oxazolines from β-amino alcohols and aldehydes was achieved in good to excellent yield by employing a potassium iodide (KI)–tert-butyl hydroperoxide (TBHP) catalytic system.
Regioselective Radical Amino-Functionalizations of Allyl Alcohols via Dual Catalytic Cross-Coupling
作者:Zuxiao Zhang、Duong T. Ngo、David A. Nagib
DOI:10.1021/acscatal.1c00404
日期:2021.3.19
range of nucleophiles with allylalcohols has been enabled by a dual catalytic strategy. This approach entails the combined action of an Ir photocatalyst that enables mild access to N-radicals via an energy transfer mechanism, as well as a Cu complex that intercepts the ensuing alkyl radical upon cyclization. Merger of this Cu-catalyzed cross-coupling enables a broad range of nucleophiles (e.g., CN
通过双重催化策略实现了一系列亲核试剂与烯丙醇的区域选择性胺化和交叉偶联。这种方法需要 Ir 光催化剂的联合作用,通过能量转移机制可以温和地接近 N-自由基,以及在环化时拦截随后的烷基自由基的 Cu 配合物。这种Cu 催化的交叉偶联的合并使广泛的亲核试剂(例如CN、SCN、N 3、乙烯基、烯丙基)能够参与烯烃的自由基氨基官能化。值得注意的是,立体、区域和动力学探针提供了对这种基于 Cu 的自由基拦截性质的见解。