Catalytic Alkene Carboaminations Enabled by Oxidative Proton-Coupled Electron Transfer
作者:Gilbert J. Choi、Robert R. Knowles
DOI:10.1021/jacs.5b05377
日期:2015.7.29
N-arylamides (bond dissociation freeenergies ∼ 100 kcal/mol) via concerted proton-coupled electron transfer (PCET) and mediating efficient carboamination reactions of the resulting amidyl radicals. This manner of PCET activation, which finds its basis in numerous biological redox processes, enables the formal homolysis of a stronger amide N-H bond in the presence of weaker allylic C-H bonds, a selectivity that
Thermal o → c rearrangement of n-phenyl-allylimidates
作者:P. Metz、C. Mues
DOI:10.1016/s0040-4020(01)86212-8
日期:1988.1
Properly substituted N-phenyl-allylimidates 1 are shown to undergo preferential O → C sigmatropic rearrangement on heating. The diastereoselectivity of this reaction resembles the one observed in ortho ester Claisenrearrangements.
An efficient Ni-catalyzed hydrodifluoroalkylation of unactivated alkenes with bromodifluoroacetate by using PhSiH3 as hydride source was developed. The transformation affords aliphatic difluorides with anti-Markovnikov regioselectivity. A wide range of highly remote alkenes, simple alkenes, drug molecules, commercially available CF2 precursors, and even nonfluorinated substrates are competent in this
investigated. Both polyfluoroalkyliodide and ethyl iododifluoroacetate, gave rise to fluorine-containing γ-butyrolactones as the main products while bromides such as ethyl bromodifluoroacetate gave the addition–reduction product. After steric and stereo effects on reaction yields were studied using various substrates, it was concluded that the reactions of 4-pentenamides and polyfluoroalkyliodides provide one
研究了由Na 2 S 2 O 4引发的含氟卤化物向4-戊烯酰胺的自由基加成反应。聚氟代烷基碘和碘代二氟乙酸乙酯均产生含氟的γ-丁内酯作为主要产物,而溴代二氟乙酸乙酯等溴化物则产生加成-还原产物。在使用各种底物研究了空间和立体反应对反应收率的影响之后,得出的结论是,4-戊烯酰胺与多氟烷基碘的反应提供了一种制备具有氟化侧链的γ-丁内酯的替代方法。
Sodium dithionite initiated reaction of pent-4-en-1-amines with fluoroalkyl iodides for the synthesis of 2-fluoroalkyl pyrrolidine derivatives
Pent-4-en-1-amines are reactive to fluoroalkyl iodides with respect to sodium dithionite initiated free radical addition reactions. We report here the development of a novel and efficient synthesis of 2-fluoroalkyl pyrrolidine derivatives by sodium dithionite initiated one-pot reaction of pent-4-en-1-amines bearing various protecting groups with fluoroalkyl iodides. Among which, the N-benzyl-pent-4-en-1-amine