非预功能化环状肟的新型光氧化还原-中性开环吡啶基化已通过磷酰基介导的 N O/C C 键断裂,然后进行自由基-自由基偶联来实现。这种温和的无酸、无碱和无氧化剂的方案提供了高度的位点选择性和高效的远端吡啶基化烷基腈,这些烷基腈可以按比例放大合成并很容易转化为骨架多样化的化合物。值得注意的是,通过氰基吡啶对高还原激发态光催化剂进行 SET 氧化而产生的氧化基态光催化剂可能会引发以下磷酰基介导的脱氧过程。
<i>gem</i>-Difluorination of Methylenecyclopropanes (MCPs) Featuring a Wagner–Meerwein Rearrangement: Synthesis of 2-Arylsubstituted <i>gem</i>-Difluorocyclobutanes
作者:Peng-Peng Lin、Long-Ling Huang、Si-Xin Feng、Shuang Yang、Honggen Wang、Zhi-Shu Huang、Qingjiang Li
DOI:10.1021/acs.orglett.1c00767
日期:2021.4.16
The protocol proceeds via a Wagner–Meerwein rearrangement with mild reaction conditions, good functional group tolerance, and moderate to good yields. The product could be readily transformed to gem-difluorocyclobutane-containing carboxylic acid, amine, and alcohol, all of which are usefulbuildingblocks for biologically active molecule synthesis.
Cobalt‐Catalyzed Tandem C−H Activation/C−C Cleavage/C−H Cyclization of Aromatic Amides with Alkylidenecyclopropanes
作者:Mingliang Li、Fuk Yee Kwong
DOI:10.1002/anie.201801706
日期:2018.5.28
A cobalt‐catalyzed chelation‐assisted tandem C−Hactivation/C−C cleavage/C−H cyclization of aromatic amides with alkylidenecyclopropanes is reported. This process allows the sequential formation of two C−C bonds, which is in sharp contrast to previous reports on using rhodium catalysts for the formation of C−N bonds. Here the inexpensive catalyst system exhibits good functional‐group compatibility
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
Reactions of Monoaryl-Substituted Methylenecyclobutanes and Methylenecyclopropanes with 1-Hydroxybenzotriazole (HOBt), 1-Hydroxy-7-azabenzotriazole (HOAt), and 1-Hydroxysuccinimide (HOSu)
作者:Min Jiang、Min Shi
DOI:10.1021/jo9000299
日期:2009.3.20
Monoaryl-substituted methylenecyclobutanes (MCBs) and methylenecyclopropanes (MCPs) react with 1-hydroxybenzotriazole (HOBt), 1-hydroxy-7-azabenzotriazole (HOAt), and 1-hydroxysuccinimide (HOSu) smoothly to produce the corresponding cyclobutylmethanone and cyclopropylmethanone derivatives 2, 4, and 5 via a cascade epoxidation and nucleophilic addition process or the corresponding epoxides 6 in moderate