Organic Dye-Catalyzed Intermolecular Radical Coupling of α-Bromocarbonyls with Olefins: Photocatalytic Synthesis of 1,4-Ketocarbonyls Using Air as an Oxidant
作者:Soumyadeep Roy Chowdhury、Deepak Singh、Injamam Ul Hoque、Soumitra Maity
DOI:10.1021/acs.joc.0c01985
日期:2020.11.6
α-bromocarbonyls where aerial oxygen played a role of an oxidant to install the keto-oxygen functionality. This unique process is compatible with both internal and terminal olefins and tolerates a diverse array of functional groups (ketone, ester, amide, diketones, ketoester, and malonate). This process is mild and environmentally friendly and deals with greener oxidants like oxygen, affording 1,4-ketocarbonyls as
Hydroalkylation of Alkynes: Functionalization of the Alkenyl Copper Intermediate through Single Electron Transfer Chemistry
作者:Avijit Hazra、Jonathan A. Kephart、Alexandra Velian、Gojko Lalic
DOI:10.1021/jacs.1c03396
日期:2021.6.2
of terminal alkynes and α-bromo carbonyls to generate functionalized E-alkenes. The coupling is accomplished by merging the closed-shell hydrocupration of alkynes with the open-shell single electron transfer (SET) chemistry of the resulting alkenyl copper intermediate. We demonstrate that the reaction is compatible with various functional groups and can be performed in the presence of aryl bromides,
我们开发了一种末端炔烃和α-溴羰基立体选择性偶联生成官能化E-烯烃的方法。偶联是通过将炔烃的闭壳氢化铜化与所得烯基铜中间体的开壳单电子转移 (SET) 化学相结合来实现的。我们证明该反应与各种官能团相容,并且可以在芳基溴、烷基氯、烷基溴、酯、腈、酰胺和多种含氮杂环化合物的存在下进行。机理研究为通过 α-溴酯对烯基铜中间体进行 SET 氧化提供了证据,这是实现交叉偶联的关键步骤。
Radical Mechanism in the Elimination of 2-Arylsulfinyl Esters
作者:Antonio Latorre、Irakusne López、Victoria Ramírez、Santiago Rodríguez、Javier Izquierdo、Florenci V. González、Cristian Vicent
DOI:10.1021/jo300699w
日期:2012.6.1
The mechanism of the dehydrosulfenylation of 2-arylsulfinyl esters was investigated. The reaction was found to follow a homolytic cleavage mechanism as verified by electrospray ionization tandem mass spectrometry and experimental work. Rearranged sulfoxides are obtained as byproduct during the elimination reaction.
Enhanced Excited-State Hydricity of Pd–H Allows for Unusual Head-to-Tail Hydroalkenylation of Alkenes