We report a novel strategy to prepare valuable nitriles and ketones through the conversion of esters under metal-free conditions. By using the I2/PCl3 system, various substrates including aliphatic and aromatic esters could react with acetonitrile and arenes to afford the desired products in good to excellent yields. This method is compatible with a number of functional groups and provides a simple
Efficient cross-coupling, allowing a straightforward access to congested benzophenones, between aromatic aldehydes and potassium aryltrifluoroborates, is described in the presence of a rhodium/tri-tert-butylphosphane catalyst system and acetone as cosolvent. The use of the stable phosphonium salts of tri-tert-butylphosphane prevented the use of highly oxidizable tri-tert-butylphosphane and allowed
The cross-coupling reaction between arylboronicacids, carbon monoxide (1 atm), and aryl iodides in the presence of palladium catalyst and base provided unsymmetrical biaryl ketones in high yields. The choice of a suitable base and solvent was essential to achieve selective formation of the unsymmetrical biaryl ketone without a biaryl by-product.
Synthesis of Diverse Aromatic Ketones through C−F Cleavage of Trifluoromethyl Group
作者:Mai Ikeda、Tsubasa Matsuzawa、Takamoto Morita、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1002/chem.202001816
日期:2020.9.25
An efficient synthetic method of aromatic ketones through C−F cleavage of trifluoromethylgroup is disclosed. The high functional group tolerance of the transformation and the remarkable stability of trifluoromethylgroup in various reactions enabled multi‐substituted aromatic ketone synthesis in an efficient route involving useful transformations such as ortho‐lithiation, aryne chemistry, and cross‐couplings
Erbium trifluoromethanesulfonate catalyzed Friedel–Crafts acylation using aromatic carboxylic acids as acylating agents under monomode-microwave irradiation
作者:Phuong Hoang Tran、Poul Erik Hansen、Hai Truong Nguyen、Thach Ngoc Le
DOI:10.1016/j.tetlet.2014.12.038
日期:2015.1
Erbium trifluoromethanesulfonate is found to be a good catalyst for the Friedel–Craftsacylation of arenes containing electron-donating substituents using aromatic carboxylicacids as the acylating agents under microwave irradiation. An effective, rapid and waste-free method allows the preparation of a wide range of aryl ketones in good yields and in short reaction times with minimum amounts of waste