Methylenation of Perfluoroalkyl Ketones using a Peterson Olefination Approach
作者:Trevor A. Hamlin、Christopher B. Kelly、Robin M. Cywar、Nicholas E. Leadbeater
DOI:10.1021/jo402577n
日期:2014.2.7
An operationally simple, inexpensive, and rapid route for the olefination of a wide array of trifluoromethyl ketones to yield 3,3,3-trifluoromethylpropenes is reported. Using a Petersonolefination approach, the reaction gives good to excellent yields of the alkene products and can be performed without purification of the β-hydroxysilyl intermediate. The reaction can be extended to other perfluoroalkyl
A novelsynthesis of perfluoroalkyl alkyl ketones via the hydrolysis of fluorinated β-ketophosphonium salts is described. In view of the fact that a one-pot reaction without isolation of intermediates and the total yield in 2 steps reaches 37-78%, the present method provides a convenient synthesis of the title compounds.
Direct conversion of primary and secondary carboxylic acids to trifluoromethyl ketones
作者:Jonathan T. Reeves、Fabrice Gallou、Jinhua J. Song、Zhulin Tan、Heewon Lee、Nathan K. Yee、Chris H. Senanayake
DOI:10.1016/j.tetlet.2006.11.068
日期:2007.1
Primary and secondary carboxylic acids were converted in one step to the corresponding trifluoromethyl ketones by treatment with trifluoroacetic anhydride (TFAA) and pyridine in toluene at 60–100 °C followed by hydrolysis/decarboxylation with water at 45 °C.
Access to Trifluoromethylketones from Alkyl Bromides and Trifluoroacetic Anhydride by Photocatalysis
作者:Hai‐Wu Du、Yi‐Dan Du、Xian‐Wang Zeng、Wei Shu
DOI:10.1002/anie.202308732
日期:2023.9.18
Catalytic methods for direct access to aliphatic trifluoromethyl ketones from feedstocks remain underdeveloped, partially owing to the high reactivity and instability of the trifluoroacetyl radical. Reported herein is the photocatalytic synthesis of trifluoromethyl ketones fromalkylbromides and trifluoroacetic anhydride. The reaction features visible-light catalysis and halogen-atom transfer (XAT)
Trifluoromethyl Ketones from Enolizable Carboxylic Acids via Enediolate Trifluoroacetylation/Decarboxylation
作者:Jonathan T. Reeves、Jinhua J. Song、Zhulin Tan、Heewon Lee、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/jo801737c
日期:2008.12.5
Primary and secondary (enolizable) carboxylic acids were converted in a single step to trifluoromethyl ketones. Treatment of the acid with 2.2 equiv of LDA generated an enediolate that was trifluoroacetylated with EtO2CCF3. Quenching the reaction mixture with aqueous HCI resulted in rapid decarboxylation and provided the trifluoromethyl ketone product in good yield. The process may be performed at -20 degrees C with a slight reduction in yield. The reaction was extended to the preparation of pentafluoroethyl and chlorodifluoromethyl ketones.