Studies on the aluminiumchloride-catalysed behaviour of β-phenylpropionyl, β,β-diphenylpropionyl, and β,β,β-triphenylpropionyl chlorides in anisole and some other aromatic stubstrates under standardised conditions are discussed. β,β-Diphenylpropionyl chloride gave yields of up to 27% 3-phenylindan-1-one in anisole and is one of the most easily cyclised acid chlorides so far reported. β,β,β-Triphenylpropionyl
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
Palladium-Catalyzed Asymmetric Reductive Heck Reaction of Aryl Halides
作者:Guizhou Yue、Kaining Lei、Hajime Hirao、Jianrong Steve Zhou
DOI:10.1002/anie.201501712
日期:2015.5.26
Asymmetric reductive Heck reaction of arylhalides is realized in high stereoselectivity. Hydrogen‐bond donors, trialkylammonium salts in a glycol solvent, were used to promote halide dissociation from neutral arylpalladium complexes to access cationic, stereoselective pathways.
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。