α-Trifluoromethylacrylates were synthesized using efficient ligand-free palladium catalyzed Mizoroki-Heckreaction. With the alkyl trifluoromethylacrylates used as substrates, different catalytic systems were explored including Pd/C as a catalyst. Good to excellent yields were obtained with good chemical tolerance
and 2‐(trifluoromethyl)acrylic acid reacted together in ligand‐free Mizoroki‐Heck reaction furnishing a quick and efficient access to highly valuable α‐trifluoromethylacrylic acids. The useful transformation was independent with regard to the electronic nature of the aryl group substituent. A three‐component one‐pot version was also developed to give diverse substituted acrylates. The versatility of
Titanium-Mediated Direct Carbon-Carbon Double Bond Formation to α-Trifluoromethyl Acids: A New Contribution to the Knoevenagel Reaction and a High-Yielding and Stereoselective Synthesis of α-Trifluoromethylacrylic Acids
stereoselective synthesis of α-trifluoromethyl unsaturated carboxylic acids directly from the reactions of 3,3,3-trifluoropropanoic acid (CF3CH2COOH) with various aryl aldehydes in the presence of titanium tetrachloride (TiCl4) is reported here for the first time, which is a valuable expansion for the classical Knoevenagel reaction. Because these compounds may have potential applications in organic electronics and
Highly Efficient Construction of Trifluoromethylated Heterocycles; [3+2] Annulation of N,N′-Cyclic or C,N-Cyclic Azomethine Imines with Trifluoromethyl-Containing Electron-Deficient Olefins
作者:De Wang、Hong-Ping Deng、Yin Wei、Qin Xu、Min Shi
DOI:10.1002/ejoc.201201244
日期:2013.1
A highly regio- and stereoselective synthesis of pyrazolidine analogues by the use of N,N′-cyclic or C,N-cyclicazomethineimines with two different trifluoromethyl-containing olefins has been developed. The method affords highly functionalized trifluoromethyl-containing pyrazolidine analogues in excellent yields with high diastereoselectivities under mild conditions.