One-Pot Synthesis of Some New Semicarbazone, Thiosemicarbazone, and Hydrazone Derivatives of 1-Phenyl-3-Arylpyrazole-4-Carboxaldehyde from Acetophenone Phenylhydrazones Using Vilsmeier–Haack Reagent
作者:Rashmi Pundeer、Pooja Ranjan、Kamaljeet Pannu、Om Prakash
DOI:10.1080/00397910802372582
日期:2008.12.31
Abstract Semicarbazone derivatives 3 of 1,3-diphenylpyrazole-4-carboxaldehyde have been synthesized in high yields through a one-pot procedure involving acetophenone phenylhydrazones 1 subjected to Vilsmeier double formylation and workup under new conditions (i.e., treatment with semicarbazide followed by sodium bicarbonate). This method is even suitable for preparing other derivatives (i.e., thiosemicarbazones
摘要 1,3-二苯基吡唑-4-甲醛的缩氨基脲衍生物 3 已通过一锅法合成高收率,涉及苯乙酮苯腙 1 进行 Vilsmeier 双甲酰化和在新条件下处理(即,用氨基脲处理,然后用碳酸氢钠处理)。该方法甚至适用于以高产率制备其他衍生物(即缩氨基硫脲 4 和腙5)。