A Visible Light-Driven Minisci-Type Reaction with N-Hydroxyphthalimide Esters
作者:Lisa Kammer、Aliyaah Rahman、Till Opatz
DOI:10.3390/molecules23040764
日期:——
A visible light-promoted protocol for the redox-neutral coupling of N-hydroxyphthalimide esters with different N-heterocyclic compounds is described. The reaction proceeds through an alkyl radical intermediate generated by reductive decarboxylation of N-hydroxyphthalimide esters. In contrast to the original Minisci protocol, polyalkylation can largely be avoided. Mechanistic investigations revealed
描述了 N-羟基邻苯二甲酰亚胺酯与不同 N-杂环化合物的氧化还原中性偶联的可见光促进协议。该反应通过 N-羟基邻苯二甲酰亚胺酯的还原脱羧产生的烷基自由基中间体进行。与最初的 Minisci 协议相比,可以在很大程度上避免多烷基化。机理研究揭示了一种自由基链机制,在某些情况下,即使不添加光催化剂也可以进行。这种有价值的和官能团耐受的反应以中等至极好的产率产生取代的杂环。使用廉价的起始材料和 LED 作为光源是这种 C-C 键形成的关键特征。
Metal-Free Oxidative Decarbonylative Coupling of Aliphatic Aldehydes with Azaarenes: Successful Minisci-Type Alkylation of Various Heterocycles
作者:Ren-Jin Tang、Lei Kang、Luo Yang
DOI:10.1002/adsc.201500268
日期:2015.6.15
A metal‐free oxidative decarbonylative coupling of aliphaticaldehydes with various electron‐deficient heterocycles has been developed. This reaction is supposed to be realized via a Minisci‐type mechanism, based on the substrate scope, regioselectivity and radical trapping experiments. The ready availability of aliphaticaldehydes, metal‐free conditions and broad substrate scope should make this method
Preparation of quinoxalines, dihydropyrazines, pyrazines and piperazines using tandem oxidation processes
作者:Steven A. Raw、Cecilia D. Wilfred、Richard J. K. Taylor
DOI:10.1039/b307177b
日期:——
α-Hydroxyketones undergo MnO2-mediated oxidation followed by in situ trapping with aromatic or aliphatic 1,2-diamines to give quinoxalines or dihydropyrazines, respectively, in a one pot procedure which avoids the need to isolate the highly reactive 1,2-dicarbonyl intermediates. Modifications of the procedure allow the formation of pyrazines and piperazines.
METHOD OF OBTAINING POLYOXYGENATED ORGANIC COMPOUNDS
申请人:CONSEJO SUPERIOR DE INVESTIGACIONES CIENT FICAS
公开号:EP1767515A1
公开(公告)日:2007-03-28
The invention relates to a method of obtaining polyoxygenated organic compounds. The inventive method is characterized in that it comprises the oxidation reaction of a diether, preferably an acetal, with an oxygen source, in the presence of: one or more radical initiating agents, one or more additives that generate a basic reaction medium, and one or more catalysts.
by coupling the electrogeneratedalkylradicals with electron deficient (hetero)arenes in an undivided cell. Simultaneous cathodic reduction of both unactivated alkylhalides and cyanobenzenes under high potential enables radical–radical cross-coupling to deliver alkylarenes in the absence of transition metals. Depending on the coupling partner, the electrogeneratedalkylradicals can also proceed