Diarylation of Alkenes by a Cu-Catalyzed Migratory Insertion/Cross-Coupling Cascade
摘要:
A strategy for the catalytic diarylation of alkenes is presented. The method involves the migratory insertion of alkenes into an Ar-Cu complex to generate a new C(sp(3))-Cu complex, which subsequently undergoes reaction with an aryl iodide to constitute a vicinal diarylation of an alkene. The method provides access to benzofuran- and indoline-containing products. Furthermore, highly diastereoselective examples are presented, allowing access to complex, stereochemically rich structures from simple alkene starting materials.
Copper-Catalyzed Dicarbofunctionalization of Unactivated Olefins by Tandem Cyclization/Cross-Coupling
作者:Surendra Thapa、Prakash Basnet、Ramesh Giri
DOI:10.1021/jacs.7b01922
日期:2017.4.26
We present a strategy that difunctionalizes unactivated olefins in 1,2-positions with two carbon-based entities. This method utilizes alkyl/arylzinc reagents derived from olefin-tethered alkyl/aryl halides that undergo radical cyclization to generate C(sp3)-Cu complexes in situ, which are intercepted with aryl and heteroaryl iodides. A variety of (arylmethyl)carbo- and heterocycles (N, O) can be synthesized
Sodium-Ketyl Radical Anions by Reverse Pinacol Reaction and Their Coupling with Iodoarenes
作者:Xinjun Tang、Armido Studer
DOI:10.1021/acs.orglett.6b02184
日期:2016.9.2
Transition-metal-free C–C bond formation between aryl iodides and pinacols is presented. Pinacols are readily transformed by deprotonation with NaH to their Na-pinacolates. C–C-bond homolysis at room temperature generates in situ the corresponding Na-ketyl radical anions which react with various aryl iodides in a homolytic aromatic substitution reaction to form tertiary Na-alcoholates. Protonation
Radical relay cyclization/C–C bond formation of allyloxy-tethered aryl iodides with quinoxalin-2(1<i>H</i>)-ones <i>via</i> polysulfide anion photocatalysis
作者:Zhongyi Zhang、Yaqin Zhou、Jiehui Wang、Yicheng Zhang、Lei Wang、Jie Liu、Chao Zhou、Min Wang、Pinhua Li
DOI:10.1039/d3ob01978k
日期:——
A visible-light-induced radical relay cyclization/C–C bondformation of quinoxalin-2(1H)-ones with allyloxy-tethered aryl iodides using polysulfide anions as a photocatalyst is described. This protocol allows efficient access to a variety of complicated molecules bearing both quinoxalin-2(1H)-one and 2,3-dihydrobenzofuran motifs in high yields under mild reaction conditions with a broad range of substrates
描述了使用多硫阴离子作为光催化剂,可见光诱导的喹喔啉-2( 1H )-酮与烯丙氧基系芳基碘化物的自由基中继环化/C-C键形成。该协议允许在温和的反应条件下使用多种底物以高产率有效获取带有喹喔啉-2(1 H )-一和2,3-二氢苯并呋喃基序的各种复杂分子。