Visible-Light-Mediated C–I Difluoroallylation with an α-Aminoalkyl Radical as a Mediator
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.1c02905
日期:2021.9.17
for direct visible-light-mediated C–I difluoroallylation reactions of α-trifluoromethyl arylalkenes with alkyliodides at room temperature with an α-aminoalkyl radical as a mediator. The protocol permits efficient functionalization of various α-trifluoromethyl arylalkenes with cyclic and acyclic primary, secondary, and tertiary alkyliodides and is scalable to the gram level. This mild protocol uses
Photocatalytic dual decarboxylative alkenylation mediated by triphenylphosphine and sodium iodide
作者:Hong-Yu Wang、Long-Jin Zhong、Gui-Fen Lv、Yang Li、Jin-Heng Li
DOI:10.1039/d0ob01242d
日期:——
alkenylation of α,β-unsaturatedcarboxylicacids and alkyl N-hydroxyphthalimide (NHP) esters mediated by triphenylphosphine and sodium iodide has been developed. This protocol proceeds under 456-nanometer irradiation by visible blue light in the absence of transition metals or organic dye based photoredox catalysts. The reaction is successfully applied to a wide range of redox-active esters derived from
Photoredox catalysis enabled alkylation of alkenyl carboxylic acids with N-(acyloxy)phthalimide via dual decarboxylation
作者:Kun Xu、Zhoumei Tan、Haonan Zhang、Juanli Liu、Sheng Zhang、Zhiqiang Wang
DOI:10.1039/c7cc05910h
日期:——
ruthenium based photoredox catalyst in combination with substoichiometric amount of 1,4-diazabicyclo[2.2.2]octane (DABCO) efficiently catalyzed dual decarboxylative couplings between alkenyl carboxylic acids and N-(acyloxy)phthalimides derived from aliphatic carboxylic acids, delivering alkylated styrene derivatives in a high regio- and stereo- selective manner under mild reaction conditions. Various types
An efficient visible-light-induced decarboxylative coupling between α,β-unsaturatedcarboxylicacids and alkyl N-hydroxyphthalimide esters has been developed. A wide range of redox-active esters derived from aliphatic carboxylicacids (1°, 2° and 3°) proved viable in this dual decarboxylation process, affording a broad scope of substituted alkenes in moderate to excellent yields with good E/Z selectivities
Catalytic Wittig Reactions of Semi- and Nonstabilized Ylides Enabled by Ylide Tuning
作者:Emma E. Coyle、Bryan J. Doonan、Andrew J. Holohan、Killian A. Walsh、Florie Lavigne、Elizabeth H. Krenske、Christopher J. O'Brien
DOI:10.1002/anie.201406103
日期:2014.11.17
The first examples of catalytic Wittigreactions with semistabilized and nonstabilized ylides are reported. These reactions were enabled by utilization of a masked base, sodium tert‐butyl carbonate, and/or ylide tuning. The acidity of the ylide‐forming proton was tuned by varying the electron density at the phosphorus center in the precatalyst, thus facilitating the use of relatively mild bases. Steric