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。
Lewis Acid-Catalyzed Cascade Reactions of Arylmethylenecyclopropanes with 1,1,3-Triarylprop-2-yn-1-ols or Their Methyl Ethers
作者:Liang-Feng Yao、Min Shi
DOI:10.1021/ol7022592
日期:2007.12.1
3-methoxy-1,3,3-triarylprop-1-yne 2 or 1,1,3-triarylprop-2-yn-1-ol 2-OH to give the corresponding functionalized methylenecyclobutene, cyclobutane, and cyclopropane derivatives in the presence of Lewisacid BF3.OEt2 under mild conditions. A plausible Meyer-Schuster rearrangement mechanism has been proposed.
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
Silver-mediated oxidative C–C bond sulfonylation/arylation of methylenecyclopropanes with sodium sulfinates: facile access to 3-sulfonyl-1,2-dihydronaphthalenes
sulfonylation/arylation of a C–C σ-bond in methylenecyclopropanes with sodium sulfinates to synthesize various 3-sulfonylated 1,2-dihydronaphthalenes is reported. This sulfonylation/arylation transformation proceeds via a sequence of sulfonylation, C–C σ-bond cleavage and intramolecular cyclization, and the experimental results show that the C–C σ-bond difunctionalization reaction includes a radical process. This
A novel and efficient AgNO3-facilitated oxidative C–C σ-bond difunctionalization of alkylidenecyclopropanes with α-ketoacids for preparing 2-acyl-substituted 3,4-dihydronaphthalenes is developed. This radical acylation/arylation transformation proceeds via decarboxylation of the α-ketoacid, acylation of the carbon–carbon double bond, cleavage of the carbon–carbon σ-bond, and cyclization with a connected
Visible-Light-Catalyzed C–C Bond Difunctionalization of Methylenecyclopropanes with Sulfonyl Chlorides for the Synthesis of 3-Sulfonyl-1,2-dihydronaphthalenes
A novel visible-light-catalyzed sulfonylation/arylation of carbon–carbon σ-bond with sulfonyl chlorides for the synthesis of 3-sulfonylated 1,2-dihydronaphthalenes is developed. This difunctionalization proceeds via a sequence of C═C bond sulfonylation, C–C σ-bond cleavage, and intramolecular cyclization, and the experiment result shows that the C–C σ-bond difunctionalization reaction includes a radical