TTMPP-catalyzed trifluoromethylation of carbonyl compounds and imines with trifluoromethylsilane
作者:Satoru Matsukawa、Marina Saijo
DOI:10.1016/j.tetlet.2008.05.053
日期:2008.7
A highly basic phosphine, tris(2,4,6-trimethoxyphenyl)phosphine (TTMPP), catalyzes trifluoromethylation using trifluoromethyltrimethylsilane to give the corresponding trifluoromethylated products in good to high yields, with both carbonylcompounds and imines.
Facile Synthesis of TMS-Protected Trifluoromethylated Alcohols Using Trifluoromethyltrimethylsilane (TMSCF<sub>3</sub>) and Various Nucleophilic Catalysts in DMF
作者:G. K. Surya Prakash、Chiradeep Panja、Habiba Vaghoo、Vijayalakshmi Surampudi、Roman Kultyshev、Mihirbaran Mandal、Golam Rasul、Thomas Mathew、George A. Olah
DOI:10.1021/jo060835d
日期:2006.9.1
Organofluorine compounds are becoming increasingly important in different fields, such as material science, agro chemistry, and the pharmaceutical industry. Nucleophilic trifluoromethylation is one of the widely used methods to incorporate a trifluoromethyl moiety into organic molecules. We have carried out extensive studies to develop varieties of easily accessible nucleophilic catalysts to promote such reactions. TMS-protected trifluoromethylated alcohols were prepared from both aldehydes and ketones in excellent yields using catalytic amount of amine N-oxide. Carbonate and phosphate salts also showed efficient catalytic activity toward this reaction. These reactions were highly solvent dependent, and DMF was found to be the most suitable one among the various solvents studied. All these reactions proceeded under very mild conditions, giving clean products and avoiding the use of any fluoride initiators or expensive catalysts, and extremely water-free conditions. The mechanism for the reaction is discussed in detail. DFT calculations were performed on the possible reaction intermediates using the Gaussian 03 program at B3LYP/6-311+G* level to support the proposed mechanism.
Anion-Initiated Trifluoromethylation by TMSCF<sub>3</sub>: Deconvolution of the Siliconate–Carbanion Dichotomy by Stopped-Flow NMR/IR
作者:Craig P. Johnston、Thomas H. West、Ruth E. Dooley、Marc Reid、Ariana B. Jones、Edward J. King、Andrew G. Leach、Guy C. Lloyd-Jones
DOI:10.1021/jacs.8b06777
日期:2018.9.5
suppliers, also affect the kinetics. Some reactions are complete in milliseconds, others take hours, and others stall before completion. Despite these differences, a general mechanism has been elucidated in which the product alkoxide and CF3– anion act as chain carriers in an anionic chain reaction. Silyl enolether generation competes with 1,2-addition and involves protonation of CF3– by the α-C–H of the
Efficient synthesis of [18F]trifluoromethane and its application in the synthesis of PET tracers
作者:Dion van der Born、J. (Koos) D. M. Herscheid、Romano V. A. Orru、Danielle J. Vugts
DOI:10.1039/c3cc37833k
日期:——
A new strategy towards [18F]trifluoromethyl-containing compounds is developed. [18F]trifluoromethane is synthesised in a fast and efficient manner and subsequently used in the reaction with aldehydes and ketones forming [18F]trifluoromethyl carbinols in good yields.