A transition-metal-free Heck-type reaction between alkenes and alkyl iodides enabled by light in water
作者:Wenbo Liu、Lu Li、Zhengwang Chen、Chao-Jun Li
DOI:10.1039/c5ob00515a
日期:——
A transition-metal-free coupling protocol between various alkenes and non-activated alkyl iodides has been developed by using photoenergy in water for the first time. Under UV irradiation and basic aqueous conditions, various alkenes efficiently couple with a wide range of non-activated alkyl iodides. A tentative mechanism, which involves an atom transfer radical addition process, for the coupling
Oxidative Addition to Palladium(0) Made Easy through Photoexcited-State Metal Catalysis: Experiment and Computation
作者:Rajesh Kancherla、Krishnamoorthy Muralirajan、Bholanath Maity、Chen Zhu、Patricia E. Krach、Luigi Cavallo、Magnus Rueping
DOI:10.1002/anie.201811439
日期:2019.3.11
conditions. Mechanistic investigations and density functional theory (DFT) studies suggest that a photoinduced inner‐sphere mechanism is operative in which a barrierless, single‐electron transfer oxidativeaddition of the alkyl halide to Pd0 is key for the efficient transformation.
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
Copper-catalyzed oxidative decarboxylative alkylation of cinnamic acids with 4-alkyl-1,4-dihydropyridines
作者:Dong Zhang、Zi-Liang Tang、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/d0cc06401g
日期:——
We have developed a new oxidative decarboxylation of cinnamic acids with 4-alkyl-1,4-dihydropyridines to construct C(sp3)-C(sp2) bond in the presence of copper catalyst and dicumyl peroxide (DCP). A variety of internal alkenes have been obtained with mild condition, broad substrates scope and excellent functional groups tolerance. This method has significant potential for application by using inexpensive
Peroxide promoted tunable decarboxylative alkylation of cinnamic acids to form alkenes or ketones under metal-free conditions
作者:Jing Ji、Ping Liu、Peipei Sun
DOI:10.1039/c5cc01762a
日期:——
In the presence of DTBP or DTBP/TBHP, the decarboxylative alkylation of cinnamic acids with alkanes gave alkenes and ketones respectively via a radical mechanism in moderate to good yields.