Pyrazole Chemistry I: Efficient Syntheses of Aryl or Benzyl 4-Pyrazolyl Ketones and Carbinols
Dilithiation of 4-bromopyrazole followed by reaction with appropriate electrophiles provides an improved access to 4-benzoylpyrazole (3) and the corresponding alcohol 4a.In a similar manner the homologous compounds 5 and 7 are conveniently available.