reagents such as phenylhydrazine hydrochloride, semicarbazide hydrochloride and thiosemicarbazide in suitable conditions leads to 1,2-aryl shift, thereby providing a novel route for the synthesis of 1,4,5-trisubstituted pyrazoles.
α,β-
查尔酮二甲
苯磺酸盐与各种试剂(如
盐酸苯
肼,
氨基
脲,
氨基
脲)和
硫代
氨基
脲的反应在合适的条件下导致1,2-芳基转移,从而为合成1,4,5-三取代的
吡唑提供了一条新途径。