New Approach to 4‐ and 5‐Aminopyrazole Derivatives
作者:Huwaida M. E. Hassaneen
DOI:10.1080/00397910701557564
日期:2007.10.1
with aromaticdiazoniumsalts to yield the corresponding 2‐arylhydrazones 2a–c. The latter products reacted with chloroacetonitrile and ethyl chloroacetate to yield 4‐aminopyrazole derivatives 5a–f. Reaction of 2 with hydrazine hydrate led to formation of 5‐amino‐4‐arylazopyrazole 6a–c. Compound 1 reacted also with trichloroacetonitrile to yield enamine 7, which in turn reacted with hydrazine hydrate