Strategic Application and Transformation of <i>ortho</i>-Disubstituted Phenyl and Cyclopropyl Ketones To Expand the Scope of Hydrogen Borrowing Catalysis
作者:James R. Frost、Choon Boon Cheong、Wasim M. Akhtar、Dimitri F. J. Caputo、Neil G. Stevenson、Timothy J. Donohoe
DOI:10.1021/jacs.5b11196
日期:2015.12.23
The application of an iridium-catalyzed hydrogen borrowing process to enable the formation of α-branched ketones with higher alcohols is described. In order to facilitate this reaction, ortho-disubstituted phenyl and cyclopropylketones were recognized as crucial structural motifs for C-C bond formation. Having optimized the key catalysis step, the ortho-disubstituted phenyl products could be further
描述了铱催化的借氢过程在能够与高级醇形成 α-支化酮中的应用。为了促进该反应,邻位双取代的苯基和环丙基酮被认为是 CC 键形成的关键结构基序。在优化了关键催化步骤后,邻位二取代苯基产物可以通过反弗里德尔-克来福特酰化反应进一步操作,以产生合成有用的羧酸衍生物。相比之下,环丙基酮与几种亲核试剂进行同共轭加成,以提供进一步功能化的支化酮产物。
Iridium(I)-Catalyzed Regioselective CH Activation and Hydrogen-Isotope Exchange of Non-aromatic Unsaturated Functionality
作者:William J. Kerr、Richard J. Mudd、Laura C. Paterson、Jack A. Brown
DOI:10.1002/chem.201405114
日期:2014.11.3
technology of increasing importance for the investigation of new CH activation and functionalization techniques, as well as in the construction of labelled molecules for use within both organic synthesis and drug discovery. Herein, we report for the first time selective iridium‐catalyzed CH activation and hydrogen‐isotope exchange at the β‐position of unsaturated organic compounds. The use of our highly
Biocatalytic green alternative to existing hazardous reaction media: synthesis of chalcone and flavone derivatives <i>via</i> the Claisen–Schmidt reaction at room temperature
作者:Kashyap J. Tamuli、Ranjan K. Sahoo、Manobjyoti Bordoloi
DOI:10.1039/d0nj03839c
日期:——
Hook. F. peel ash (MCPA) are used as catalysts to promote an inexpensive, efficient and eco-friendly carbon–carbon bond forming crossed aldol reaction at room temperature in solvent free conditions. Furthermore, the resulting products were subjected to reactions with these promoters in an oxygen atmosphere and led to the formation of novel flavone derivatives. Moreover, the used catalysts were properly
Acid-promoted cyclization of 2,4-diaryl-1,1,1-trifluorobut-3-en-2-oles and their TMS-ethers into CF<sub>3</sub>-indenes
作者:Matvei Yu. Martynov、Roman O. Iakovenko、Anna N. Kazakova、Irina A. Boyarskaya、Aleksander V. Vasilyev
DOI:10.1039/c7ob00406k
日期:——
2,4-Diaryl-1,1,1-trifluorobut-3-en-2-oles and their TMS-ethers in H2SO4 at room temperature in just 2 min are quantitatively cyclized into 1-aryl-3-trifluoromethyl-1H-indenes. The reaction proceeds through an intermediate formation of the corresponding CF3-allyl cations, which are cyclized regioselectively at the allyl carbon atom most remote from the CF3-group. The obtained CF3-indenes in solution
在室温下仅2分钟的时间内,将2,4-二芳基-1,1,1-三氟丁-3-烯-2-烯烃及其TMS-醚在H 2 SO 4中定量环化成1-芳基-3-三氟甲基- 1 H-茚。该反应通过中间形成相应的CF 3-烯丙基阳离子进行,该中间体在最远离CF 3-基团的烯丙基碳原子上区域选择性地环化。将得到的CF 3-茚在EtOAc溶液中,在硅胶存在下,在室温下于4小时内定量异构化成3-芳基-1-三氟甲基-1 H-茚。
Conjugate Reduction of α,β-Unsaturated Ketones with Amphiphilic Reaction System
The conjugatereduction of α,β-unsaturated ketones has been effected with amphiphilic reaction system consisting of methylaluminum bis(2,6-di-t-butyl-4-alkylphenoxide) and certain complex aluminum hydride reagent.