Pyrazole-1H-4-yl-acrylic acids (3a-j) were prepared from pyrazole-1H-4-carbaldehydes which in turn were prepared by the Vilsmeier-Haack reaction of phenyl hydrazone derivatives (1a-j). The reaction of pyrazole-1H-4-yl-acrylic acids to 3-(1, 3-diphenyl-1H-pyrazol-4-yl) propanoic acids (4a-j) was carried out using Pd-charcoal and diimide methods and % yields were compared. Though the yields may be slightly less in diimide method, the method was found to be economical, highly effective with simple operating procedure.
从苯基腙衍生物(1a-j)的Vilsmeier-Haack反应制备的吡唑-1H-4-基丙烯酸(3a-j)制备而成的吡唑-1H-4-基丙烯酸(3a-j)制备自吡唑-1H-4-羰基醛。使用Pd-木炭和二亚甲基方法进行吡唑-1H-4-基丙烯酸反应制备3-(1,3-二苯基-1H-吡唑-4-基)丙酸(4a-j),并比较产率。尽管二亚甲基方法的产率可能略低,但该方法被证明在操作程序简单的情况下经济高效。