A Novel Approach for the Formation of Carbon−Nitrogen Bonds: Azidation of Alkyl Radicals with Sulfonyl Azides
作者:Cyril Ollivier、Philippe Renaud
DOI:10.1021/ja004129k
日期:2001.5.1
Two preparatively attractive methods for the azidation of alkyl radicals are described. Secondary and tertiary alkyl iodides and dithiocarbonates are easily converted into the corresponding azides, either by reaction with ethanesulfonyl azide in the presence of dilauroyl peroxide, or by treatment with benzenesulfonyl azide and hexabutylditin in the presence of a radical initiator. Interestingly, intramolecular
Photoredox/Cobalt Dual‐Catalyzed Decarboxylative Elimination of Carboxylic Acids: Development and Mechanistic Insight
作者:Kaitie C. Cartwright、Ebbin Joseph、Chelsea G. Comadoll、Jon A. Tunge
DOI:10.1002/chem.202001952
日期:2020.9.25
Recently, dual‐catalytic strategies towards the decarboxylative elimination of carboxylicacids have gained attention. Our lab previously reported a photoredox/cobaloxime dual catalytic method that allows the synthesis of enamides and enecarbamates directly from N‐acyl amino acids and avoids the use of any stoichiometric reagents. Further development, detailed herein, has improved upon this transformation's
Vinylic, allylic and homoallylic oxidations of alkenes via π- and σ-organopalladium complexes
作者:N.Yu. Kozitsyna、M.N. Vargaftik、I.I. Moiseev
DOI:10.1016/s0022-328x(99)00521-5
日期:2000.1
alkenes via intermediate organopalladiumcomplexes are discussed. The oxidation of propylene, hex-1-ene and cyclohexene by PdII acido complexescontaining achiral, racemic and chiral carboxylate ligands was first studied in a series of solvents other than acetic acid. Significant changes in the selectivity of the PdII-promoted reaction with changes in the solvent nature and ligand chirality were observed
selectivity in palladium-catalyzedacetoxylation of substituted cycloalkenes and linear alkenes, the influence of added strong acids has been studied. It was found that the product selectivity can be increased in some cases, but also that side reactions lower the total yields when trifluoroacetic or stronger acids are used. The improvement of the selectivity may possibly be due to a change in mechanism for the
Mechanistic investigations of bipyrimidine-promoted palladium-catalyzed allylic acetoxylation of olefins
作者:Bo-Lin Lin、Jay A Labinger、John E Bercaw
DOI:10.1139/v08-133
日期:2009.1.1
(bipyrimidine)Pd(OAc)2. No KIE is observed for the competition experiment between allylbenzene-d0 and allylbenzene-d5 (CD2=CDCD2C6H5), suggesting that allylic C–H activation is not rate-determining. Catalytic allylicacetoxylations of other terminal olefins as well as cyclohexene were also effected by (bipyrimidine)Pd(OAc)2.