Visible light-induced palladium-catalyzed ring opening β-H elimination and addition of cyclobutanone oxime esters
作者:Wei-Long Xing、Rui Shang、Guang-Zu Wang、Yao Fu
DOI:10.1039/c9cc08077e
日期:——
A palladium catalyst under visible light irradiation activates cyclobutanone oxime ester through single electron transfer to induce radical ringopening to generate hybrid cyanoalkyl Pd(I) radical species. Hybrid cyanoalkyl Pd(I) radical species can undergo either β-H elimination to deliver (E)-4-arylbut-3-enenitrile or undergo radical addition with silyl enol ether and enamide to generate δ-cyano
Copper-Catalyzed Enantioselective Arylation via Radical-Mediated C–C Bond Cleavage: Synthesis of Chiral ω,ω-Diaryl Alkyl Nitriles
作者:Guo-Qing Cui、Jing-Cheng Dai、Yan Li、Yuan-Bo Li、Duo-Duo Hu、Kang-Jie Bian、Jie Sheng、Xi-Sheng Wang
DOI:10.1021/acs.orglett.1c02725
日期:2021.10.1
The first example of copper-catalyzed ring-opening, enantioselective arylation of cyclic ketoxime esters to access ω,ω-diaryl alkyl nitriles has been developed in high yield (up to 92% yield) with excellent enantioselectivity (up to 91% ee). Side-arm bis(oxazoline) ligand plays a significant role in this asymmetric catalytic transformation, which provides an efficient route to construct diverse chiral
The first intermolecular ring-opening hydroacylation of alkylidenecyclopropanes with chelating aldehydes through a rhodium-catalyzed acrylamide-promoted protocol is reported. This highly efficient catalytic system enables the direct synthesis of a diverse range of linear γ,δ-unsaturated ketones. Good functional group compatibility is demonstrated for the completely atom-economical and remarkably selective
A rhodium(<scp>iii</scp>)-catalyzed tunable coupling reaction of indole derivatives with alkylidenecyclopropanes<i>via</i>C–H activation
作者:Ruixing Liu、Yin Wei、Min Shi
DOI:10.1039/c9cc03134k
日期:——
We herein report a rhodium(III)-catalyzed cross coupling of indole derivatives with alkylidenecyclopropanes (ACPs) in the presence of KCl, affording the alkene products exclusively with E-selectivity via C–H bond activation. The beta-H elimination to afford the conjugated diene derivatives has been suppressed by the addition of KCl. A plausible reaction mechanism has been proposed along with derivatization
A novel synthetic method for alkylidenecyclopropanes based on the reaction of magnesium cyclopropylidenes with lithium α-sulfonyl carbanions
作者:Tsuyoshi Satoh、Shinya Saito
DOI:10.1016/j.tetlet.2003.10.162
日期:2004.1
Treatment of 1-chlorocyclopropyl phenyl sulfoxides with isopropylmagnesium chloride at low temperature gave magnesium cyclopropylidenes. The reaction of the generated carbenoids with lithium α-sulfonylcarbanions was found to afford alkylidenecyclopropanes in moderate to good yields. This reaction offers a novel, unprecedented, and versatile method for a synthesis of several alkylidenecyclopropanes from