of 2-fluoropyrazine allowed the synthesis of various 5- and 6-iodofluoropyrazines. Use of cross-coupling reactions with iodofluoropyrazines under Suzuki or Negishi conditions led to aryl and alkylfluoropyrazines. The benzylfluoropyrazines have been used as building block to synthesize a wide range of arylbenzylfluoropyrazines which could exhibit mesomorphicproperties.
Regioselective synthesis and metallation of tributylstannylfluoropyrazines. Application to the synthesis of some new fluorinated liquid crystals diazines. Part 34
Starting from fluoropyrazine, a general synthetic route including metallation and palladium-catalyzed cross-coupling reactions is described to access to rod-like alkylaryl or diarylpyrazines. Among them, some have liquid crystalline properties.