DIRECT TRIFLUOROMETHYLATIONS USING TRIFLUOROMETHANE
申请人:Prakash G.K. Surya
公开号:US20140066640A1
公开(公告)日:2014-03-06
A direct trifluoromethylation method preferably using a trifluoromethane as a fluoro-methylating species. In particular, the present method is used for preparing a trifluoromethylated substrate by reacting a fluoromethylatable substrate with a trifiuoromethylating agent in the presence of an alkoxide or metal salt of silazane under conditions sufficient to trifluoromethylate the substrate; wherein the fluoromethylatable substrate includes chlorosilanes, carbonyl compounds such as esters, aryl halides, aldehydes, ketones, chalcones, alkyl formates, alkyl halides, aryl halides, alkyl borates, carbon dioxide or sulfur.
Substituent Effects on the Solvolysis of 1,1-Diphenyl-2,2,2-trifluoroethyl Tosylates: Comparison between Symmetrically Disubstituted and Monosubstituted Systems
The solvolysis rates of 1-(substituted phenyl)-1-phenyl-2,2,2-trifluoroethyl and 1,1-bis(substituted phenyl)-2,2,2-trifluoroethyl tosylates or bromides were conductimetrically measured at 25.0 °C i...
Enantioselective Rhodium-Catalyzed Addition of Arylboronic Acids to Trifluoromethyl Ketones
作者:Renshi Luo、Ke Li、Yuling Hu、Wenjun Tang
DOI:10.1002/adsc.201201125
日期:2013.5.3
C2‐symmetrical, chiral bisphosphorus ligand proved to be efficient for the rhodium‐catalyzed nucleophilic addition of arylboronicacids to trifluoromethylketones, providing a series of chiral trifluoromethyl‐substituted tertiary alcohols in high yields (up to 93%) and excellent enantioselectivities (>99%).
Performing catalytic enantioselective carbon–carbon bond forming reactions, especially for the synthesis of tertiary carbinols, is one of the most challenging goals in modern asymmetric synthesis. Herein, we report an efficient enantioselective catalytic approach for the 1,2-addition of arylboronicacids to trifluoromethylketones affording tertiary trifluoromethyl-substituted alcohols with high yields
The reaction of trifluoroacetyl amides with Grignard reagent for the substitution of CF3 group with various alkyl or arylgroups is described. A variety of aryl, quinolin-8-yl, and (hetero)alkyl functional groups as well as F, Cl, and Br atoms are well tolerated. These moisture-stable and easily available trifluoroacetyl amides can be conveniently obtained and used as new versatile precursors for isocyanates