AuI-Catalyzed Intramolecular Cyclization of 2-Alkenylphenyl Carbonyl Compounds: Exploring the Oxophilic Lewis Acidity of AuI Species
作者:Arun R. Jagdale、So Won Youn
DOI:10.1002/ejoc.201100113
日期:2011.7
2-alkenylphenyl carbonyl compounds to afford a variety of indene, indenol, and indanone ring systems was developed. In this process, AuI serves to activate the carbonyl group of β-keto esters, aldehydes, and ketones, preferentially exhibiting oxophilicity in the presence of C–C multiplebonds. Furthermore, β-keto esters could participate as the electrophilic partner in reactions with carbon nucleophile
Phosphazene base-catalyzed hydroamination of aminoalkenes for the construction of isoindoline scaffolds: Application to the total synthesis of aristocularine
A method for isoindoline synthesis via phosphazene base-catalyzed intramolecular hydroamination of aminoalkenes was developed. The reaction has a broad functional group tolerance, including for halide, cyano, and methoxy groups, and could also be used to synthesize tetrahydroisoquinoline, pyrrolidine, and piperidine. The method was used as a key step in the total synthesis of aristocularine in six
建立了磷腈碱催化氨基烯烃分子内加氢胺化合成异二氢吲哚的方法。该反应具有广泛的官能团耐受性,包括卤化物、氰基和甲氧基,也可用于合成四氢异喹啉、吡咯烷和哌啶。该方法被用作马兜铃碱全合成的关键步骤,分六步进行,总产率为 35%。该策略涉及通过控制所需 C N 键的形成来构建异二氢吲哚核心,而相对不稳定的甲氧基甲基和芳基溴保持完整。
De Novo Protocol for the Construction of Benzo[<i>a</i>]fluorenes via Nitrile/Alkene Activation
作者:Babasaheb Sopan Gore、Chun-Hsien Chiang、Chein Chung Lee、Yi-Lun Shih、Jeh-Jeng Wang
DOI:10.1021/acs.orglett.0c02739
日期:2020.10.16
benzo[a]fluorenes were constructed from the reaction of (E)-2-aroyl-3-(2-(arylalkynes/alkenes)aryl)acrylonitrile scaffolds under metal-free conditions via the activation of nitriles and alkenes, respectively. A tentative reaction mechanism was proposed for this homofunctionalization of nitriles. Control experiments showed that the reaction proceeds via selective nitrile or alkene protonation, depending upon
由(E)-2-芳基-3-(2-(芳基炔烃/烯烃)芳基)丙烯腈支架在以下条件下反应,可实现前所未有的苯并[ a ]芴和萘酰胺取代的苯并[ a ]芴的化学和区域选择性合成。分别通过腈和烯烃的活化实现无金属条件。为腈的这种均官能化提出了一种初步的反应机理。对照实验表明,取决于底物,反应通过选择性腈或烯烃质子化而进行。此外,我们证明了在仅存在TfOH的情况下合成二取代苯并[ a ]芴的另一种快捷途径。
Organoselenium-Catalyzed Aza-Wacker Reactions: Efficient Access to Isoquinolinium Imides and an Isoquinoline N-Oxide
作者:Huimin Li、Lihao Liao、Xiaodan Zhao
DOI:10.1055/s-0039-1690103
日期:2019.9
organoselenium-catalyzed aza-Wacker reaction of olefinic hydrazones and an oxime to form isoquinolinium imides and an isoquinoline N-oxide is developed. This transformation involves a direct intramolecular C–H amination using hydrazones and an oxime as imine-type nitrogen sources. This work not only provides a new approach for the construction of isoquinoline derivatives, but also expands the scope of nitrogen
An efficient straightforward metal free domino approach was developed for the synthesis of various 8-hydroxy-2,8-dihydroindeno[2,1-c]pyrazoles via [3 + 2] cycloaddition of substituted alkenes and TsDAM (TosylDiAzoMethane). The salient features of this protocol include high efficiency, mild reaction conditions, greener solvent, metal-free reaction, scalability and broad substrate scope along with high
开发了一种有效的直接无金属多米诺骨牌方法,用于通过取代烯烃和 TsDAM(TosylDiAzoMethane)的 [3 + 2] 环加成合成各种 8-羟基-2,8-二氢茚并[2,1- c ]吡唑。该协议的显着特点包括高效、温和的反应条件、更环保的溶剂、无金属反应、可扩展性和广泛的底物范围以及高区域选择性和产量。