Alkene homologation <i>via</i> visible light promoted hydrophosphination using triphenylphosphonium triflate
作者:Vitalij V. Levin、Alexander D. Dilman
DOI:10.1039/d0cc07025d
日期:——
A hydrophosphination reaction of alkenes with triphenylphosphonium triflate under photocatalytic conditions is described. The reaction is promoted by naphthalene-fused N-acylbenzimidazole and is believed to proceed through intermediate formation of a phosphinyl radical cation. The resulting phosphonium salts are directly involved in the Wittig reactionleading to homologated alkenes.
Visible Light‐Driven, Room Temperature Heck‐Type Reaction of Alkyl Halides with Styrene Derivatives Catalyzed by B
<sub>12</sub>
Complex
作者:Li Chen、Yoshio Hisaeda、Hisashi Shimakoshi
DOI:10.1002/adsc.201801707
日期:2019.6.18
A visible light driven Heck‐type coupling reaction of alkyl halides with styrene and its derivatives catalyzed by the cobalamin derivative (B12) with the [Ru(bpy)3]Cl2 photosensitizer at room temperature is reported. The catalytic efficiencies of the B12 catalyst were compared to that of other cobalt complexes such as cobaloxime. Various control experiments supported a radical‐based mechanism similar
Palladium-Catalyzed Allylic Cross-Coupling Reactions of Primary and Secondary Homoallylic Electrophiles
作者:Benjamin J. Stokes、Susanne M. Opra、Matthew S. Sigman
DOI:10.1021/ja305403s
日期:2012.7.18
cross-coupling of homoallylic tosylate substrates using boronic acids and pinacol esters is reported. The reaction uses 2-(4,5-dihydro-2-oxazolyl)quinoline (quinox) as a ligand and is performed at ambient temperature. The scope of the reaction is broad in terms of both the boronate transmetalating reagent and the substrate and includes secondary tosylates. Mechanistic studies support an alkene-mediated
Irradiation-Induced Palladium-Catalyzed Decarboxylative Heck Reaction of Aliphatic <i>N</i>-(Acyloxy)phthalimides at Room Temperature
作者:Guang-Zu Wang、Rui Shang、Yao Fu
DOI:10.1021/acs.orglett.8b00023
日期:2018.2.2
It is reported that Pd(PPh3)2Cl2 in combination with 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos) under irradiation of blue LEDs efficiently catalyzes a decarboxylative Heck reaction of vinyl arenes and vinyl heteroarenes with aliphatic N-(acyloxy)phthalimides at roomtemperature. A broad scope of secondary, tertiary, and quaternary carboxylates, including α-amino acid derived esters
Photoinduced copper-catalyzed dual decarboxylative coupling of α,β-unsaturated carboxylic acids with redox-active esters
作者:Xiao-Yu Lu、Ang Gao、Qi-Le Liu、Ze-Jie Xia
DOI:10.1016/j.tet.2021.132259
日期:2021.7
The first photoinduced copper-catalyzed dual decarboxylative cross-coupling of α,β-unsaturatedcarboxylicacids and redox-active esters has been developed. This reaction enabled C(sp2)–C(sp3) bond formation, which afforded a variety of synthetically valuable alkene derivatives. Many α,β-unsaturatedcarboxylicacids and redox-active ester derivatives were tolerant to this reaction. The reaction also