Concise and Efficient Synthesis of 1<i>H</i>-Pyrazoles: Reaction of [Hydroxy(tosyloxy)iodo]benzene with Ethyl 2,3-Dioxobutanoate-2-arylhydrazones
作者:Himatkumar V. Patel、Kavita A. Vyas、Sudhanshu P. Pandey、Francis Tavares、P. S. Fernandes
DOI:10.1080/00397919108021057
日期:1991.8
Abstract Ethyl 2,3-dioxobutanoate-2-arylhydrazones 1 on treatment with [hydroxy(tosyloxy)iodo]benzene 2 at reflux temperature and followed by heating in the presence of N-ethyldiisopropylamine afforded the cyclized ethyl 1-aryl-4-hydroxy-1H-3-pyrazolecarboxylates 4 in good yield.
摘要 2,3-二氧代丁酸乙酯-2-芳基腙1在回流温度下用[羟基(甲苯磺酰氧基)碘]苯2处理,然后在N-乙基二异丙胺存在下加热,得到环化的1-芳基-4-羟基- 1H-3-吡唑羧酸盐4的产率良好。