Iridium-Catalyzed Synthesis of Substituted Indanones from Aromatic Carboxylates and Unsaturated Ketones
作者:Guodong Zhang、Zhiyong Hu、Giulia Bertoli、Lukas J. Gooßen
DOI:10.1021/acscatal.9b02536
日期:2019.9.6
A catalytic annulation is presented that provides straightforward, modular synthetic access to 3-substituted indanones from benzoic acids and α,β-unsaturated ketones. It is catalyzed by a bimetallic Ir/In system and proceeds via hydroarylation followed by Claisen condensation and optional retro-Claisen deacylation. The annulation may be combined into a one-pot procedure with the synthesis of the unsaturated
Cinnamonitrile as a precursor of a bi-centered electrophile in reactions with arenes in triflic acid
作者:Yelizaveta Gorbunova、Dmitriy N. Zakusilo、Aleksander V. Vasilyev
DOI:10.1016/j.tetlet.2019.02.047
日期:2019.4
for 1 h gave two types of compounds, 3-aryl-3-phenyl propionitriles [Ar(Ph)CHCH2CN] and/or 3-phenylindanones in 28–76% yield. The formation of these two reaction products depends on the nucleophilicity of the arene. In these reactions, carbocations generated upon the protonation of cinnamonitrile in TfOH behave as bi-centered electrophiles possessing reactive centers on the C3 carbon of the double bond
Superacid-Catalyzed Reactions of Cinnamic Acids and the Role of Superelectrophiles<sup>1</sup>
作者:Rendy、Yun Zhang、Aaron McElrea、Alma Gomez、Douglas A. Klumpp
DOI:10.1021/jo030327t
日期:2004.4.1
formation of dicationic intermediates (superelectrophiles), and the reactions can lead to either chalcone-type products or indanone products. The directobservation of a dicationic species (by low-temperature 13C NMR) is reported. We provide clear evidence that protonated carboxylic acid groups (or the corresponding acyl cation) can enhance the reactivity of an adjacent electrophilic center. Triflic acid
已经研究了肉桂酸和相关化合物的化学性质。在超酸催化的芳烃反应中,提出了两种相互竞争的反应机理。两种机理都涉及形成阳离子型中间体(超亲电子试剂),并且这些反应可导致查尔酮类产物或茚满酮产物。据报道直接观察到一种特殊的物质(通过低温13 C NMR)。我们提供了明确的证据,表明质子化的羧酸基团(或相应的酰基阳离子)可以增强相邻亲电中心的反应活性。三氟甲磺酸还被发现是从肉桂酸直接合成某些缺电子的查耳酮和杂环查耳酮的有效酸催化剂。
Superacid-Promoted Dual C-C Bond Formation by Friedel-Crafts Alkylation and Acylation of Ethyl Cinnamates: Synthesis of Indanones
A superacid (triflic acid) promoted dual C–C bond formation via intermolecular Friedel–Crafts alkylation (Michael addition type) and intramolecular acylation for the efficient synthesis of 3-substituted indan-1-ones is presented. This method was successful in activating ethyl cinnamates towards dual aromatic electrophilic substitution. Moreover, it enabled us to synthesize novel spirotetracyclic systems
Gold-Catalyzed Carboalkoxylations of 2-Ethynylbenzyl Ethers to form 1- and 2-Indanones Chemoselectively: Effects of Ligands and Solvents
作者:Chiou-Dong Wang、Yi-Feng Hsieh、Rai-Shung Liu
DOI:10.1002/adsc.201300988
日期:2014.1.13
acidic [tris(pentafluorophenyl)phosphine]gold hexafluoroantimonate [P(C6F5)3AuSbF6] in nitromethane (MeNO2) preferably gives 1‐indanones whereas [(ortho‐biphenyl)di(tert‐butyl)phosphine]gold triflimide [P(tBu)2(o‐biphenyl)AuNTf2] in dichloroethane tends to form 2‐indanone derivatives. For 2‐indanone products, we isolated two indenyl methyl ethers for deuterium labeling analyses, providing evidence for
使用合适的催化剂和溶剂,可以从2-乙炔基苄基醚选择性合成1-和2-茚满酮化合物。硝基甲烷(MeNO 2)中的高酸性[三(五氟苯基)膦]六氟锑酸金[P(C 6 F 5)3 AuSbF 6 ]优选产生1-茚满酮,而[(邻-联苯基)二(叔丁基)膦]三氟化金[P(t Bu)2(o-联苯)AuNTf 2]在二氯乙烷中往往会形成2-茚满酮衍生物。对于2-茚满酮产品,我们分离了两个茚基甲基醚进行氘标记分析,为π-炔烃活化提供了证据。