Dipyrrolidinomethylaminophosphoric acid triamide (DPMPA) as an activator for the samarium diiodide-mediated reduction of alkyl and aryl halides
作者:Chriss E. McDonald、Jeremy R. Ramsey、David G. Sampsell、Laura A. Anderson、Jordan E. Krebs、Samantha N. Smith
DOI:10.1016/j.tet.2013.02.025
日期:2013.4
The use of the conjugate base of dipyrrolidinomethylaminophosphoric triamide (DPMPA−) as an activator of samariumdiiodide is reported. This phosphoramidate has been shown to be a very potent ligand, allowing for the efficient, low-temperature reduction of alkyl and aryl chlorides. Reductive cyclizations of haloalkenylnaphthalenes are also reported.
The reactivities of aryl and vinylradicals, two fundamental transient intermediates, have been investigated with respect to two elementary processes: H-atom abstraction and reaction with a nucleophile (Y−, in the SRN1 reaction). The radicals of interest were generated from haloarene or haloethene precursors, either by use of the Bu3SnH/AIBN system or by photostimulated electron transfer from a nucleophile
The SmI<sub>2</sub>/TEU<sup>–</sup>-Mediated Cyclization of Unsaturated Halides
作者:Chriss E. McDonald、Holly D. Bendorf、Joseph R. Mauck、Christopher C. McAtee、Ahren I. Green、David J. Ciccarelli、Cassandra A. Bendyk、Brandon J. Conrad、Angelique T. Delgado
DOI:10.1021/acs.orglett.0c02074
日期:2020.7.17
The combination of SmI2 and the conjugate base of triethylurea (TEU–) has been shown to favor the cyclization of unsaturated halides over direct reduction to a much greater extent than other SmI2-based reductants. Aryl, heteroaryl, and alkyl halides (X = Br, Cl, F) readily undergo heterocyclization and carbocyclization in the presence of SmI2/TEU–.
SMI的组合2和triethylurea的共轭碱(TEU - )已被证明有利于不饱和卤化物超过直接还原到更大的程度比其他SMI环化2系还原剂。在SmI 2 / TEU –的存在下,芳基,杂芳基和卤代烷(X = Br,Cl,F)容易发生杂环化和碳环化。
Anions from dihydro substituted ethyl benzoates and quinoline. New hydrogen donors for tin-free radical chemistry
作者:Javier I. Bardagí、Santiago E. Vaillard、Roberto A. Rossi
DOI:10.1016/j.tetlet.2006.02.139
日期:2006.5
The anions of substituted dihydro ethyl benzoates and quinoline are very good hydrogen donors to radicals in liquidammonia and DMSO. With 4-substituted dihydro ethyl benzoates the rate of hydrogen transfer decreases and excellent yields of products are obtained by 6-exo ring closure reaction followed by reduction.