抽象的 吲哚支架的合成主要依靠N保护的链烯基苯胺的C–H氧化胺化作用进行C–N分子内环化反应。在此,在没有催化N的情况下,通过在催化量的FeF 2存在下使用K 2 S 2 O 8作为氧化剂,将各种容易制备的2-烯基苯胺以高收率转化成所需的吲哚产物。K 2 S 2 O 8 / FeF 2系统为3-芳基吲哚提供了直接而良性的合成途径,适用于包括药物中间体在内的各种取代的吲哚。 吲哚支架的合成主要依靠N保护的链烯基苯胺的C–H氧化胺化作用进行C–N分子内环化反应。在此,在没有催化N的情况下,通过在催化量的FeF 2存在下使用K 2 S 2 O 8作为氧化剂,将各种容易制备的2-烯基苯胺以高收率转化成所需的吲哚产物。K 2 S 2 O 8 / FeF 2系统为3-芳基吲哚提供了直接而良性的合成途径,适用于包括药物中间体在内的各种取代的吲哚。
Visible-Light Photocatalytic Decarboxylative Alkyl Radical Addition Cascade for Synthesis of Benzazepine Derivatives
作者:Yu Zhao、Jia-Rong Chen、Wen-Jing Xiao
DOI:10.1021/acs.orglett.7b03588
日期:2018.1.5
cascade reaction of acrylamide-tethered styrenes for the synthesis of benzazepinederivatives is described. This protocol features broad substrate scope, excellent functional group tolerance, and mild reaction conditions, affording the seven-membered rings in good yields. This method was also applied for efficient grafting of the benzazepine scaffold into the pharmaceutically active ursolic acid scaffold
Photocatalyzed Intramolecular [2+2] Cycloaddition of
<i>N</i>
‐Alkyl‐
<i>N‐(</i>
2‐(1‐arylvinyl)aryl)cinnamamides
作者:Wanderson C. Souza、Bianca T. Matsuo、Priscilla M. Matos、José Tiago M. Correia、Marilia S. Santos、Burkhard König、Marcio W. Paixão
DOI:10.1002/chem.202003641
日期:2021.2.19
N‐Alkyl‐N‐(2‐(1‐arylvinyl)aryl)cinnamamides are converted into natural product inspired scaffolds via iridium photocatalyzed intramolecular [2+2] photocycloaddition. The protocol has a broad substrate scope, whilst operating under mild reaction conditions. Tethering four components forming a trisubstituted cyclobutane core builds rapidly high molecular complexity. Our approach allows the design and
N-烷基-N-( 2-(1-芳基乙烯基)芳基)肉桂酰胺通过铱光催化的分子内[2 + 2]光环加成反应转变为天然产物。该协议具有广泛的底物范围,同时在温和的反应条件下运行。束缚形成三取代的环丁烷核心的四个成分会迅速建立高分子复杂性。我们的方法允许设计和合成多种四氢环丁酮[ c ]喹啉-3(1 H)-酮,产率在20–99%之间,并且具有出色的区域选择性和非对映选择性。此外,已证明在环丁烷环断裂后,1,7-烯炔的分子内[2 + 2]-环加成反应会导致类似烯炔的复分解。
作者:Andrew Whyte、Katherine I. Burton、Jingli Zhang、Mark Lautens
DOI:10.1002/anie.201808460
日期:2018.10.15
An enantioselective copper‐catalyzed intramolecular borylacylation is reported. The reaction proceeds through an initial enantioselective borylcupration of the styrene, followed by a nucleophilic attack on the tethered carbamoyl chloride. The products, chiral borylated 3,3‐disubstituted oxindoles, were generated in excellent yields and enantioselectivities. The versatile carbon–boron bond provides
Efficient synthesis of SCF<sub>3</sub>-substituted tryptanthrins by a radical tandem cyclization
作者:Jincheng Guo、Yanan Hao、Gang Li、Ziwen Wang、Yuxiu Liu、Yongqiang Li、Qingmin Wang
DOI:10.1039/d0ob00233j
日期:——
we report a new, efficient and atom-economical strategy for the synthesis of SCF3-substituted tryptanthrin derivatives. These previously unreported derivatives were obtained by means of a radical tandem cyclization. The reaction was triggered by addition of a SCF3 radical to a carbon-carbon double bond and involved the formation of a C(sp3)-SCF3 bond, a C(sp2)-C bond, and a C(sp2)-N bond. This method
Palladium-Catalyzed Sequential Vinylic C–H Arylation/Amination of 2-Vinylanilines with Aryl boronic Acids: Access to 2-Arylindoles
作者:Ruixia Yu、Dejun Li、Fanlong Zeng
DOI:10.1021/acs.joc.7b02728
日期:2018.1.5
A palladium-catalyzed selective and successive vinylic C–H arylation/amination of 2-vinylanilines with arylboronic acids to generate indoles has been developed. This procedure represents a straightforward and practical approach to valuable multifunctionalized indoles.