摘要:
The reaction of 3-aroyl-6-aryl-4-hydroxy-2H-pyran-2-ones (Ar = p-tolyl, 1,1'-biphenyl-4-yl or thienyl) with aniline and substituted o-phenylenediamine (R = H, CH3 or Cl) yields a series of new Schiff bases 2 a - f in 51 - 72% yield. Bromination of 1 a gave the 5-bromo derivative 1 c, while the compounds 1 a, 1 b, 2 b, 2e, and 2 f were converted into 2,6-diaryl-4 H-pyran-4-ones 3 a - c. All products have been fully characterized.