No abstract

The synthesis of trifluoroethylamines as amide bond mimics is an interesting topic in current research. They are well known tools in pharmaceutical and agrochemical industry. Other methods described in literature are often restricted to few substrates. We herein report a new synthetic approach towards this class of substances. First, the trimethylaluminium-promoted generation of a trifluoromethyl-ketimine from the corresponding trifluoromethyl ketone and an aniline derivative was investigated. Next, the ketimine was converted into the trifluoro-A C H T U N G T R E N N U N G ethylamines in a one-pot reaction by simple addition of borane-methyl sulfide complex.

Fluoroolefins, which play an increasingly important role as peptide mimics in pharmaceuticals and as crop protection agents, are generated using a fluoro-Julia-Kocienski olefination. Their preparation can easily be accomplished using a Mitsunobu reaction and subsequent oxidation to generate the required benzothiazolyl sulfones. The key step of this process was the electrophilic a-fluorination of the sulfone with N-fluorobenzenesulfonimide. The last stage of the successful synthesis of the fluoroolefins was the modified Julia-Kocienski olefination under basic conditions. Further functionalization was followed with the application of a Suzuki reaction.