Synthesis of 3-hydroxy-5-per(poly)fluoroalkyl pyrazoles
作者:Qiao-Sheng Hu、Hui-Ping Guan、Chang-Ming Hu
DOI:10.1016/0022-1139(95)03292-l
日期:1995.11
Treatment of ethyl alpha-per(poly)fluoroalkyl acetates 1 or ethyl alpha-iodo-beta-per(poly) fluoroalkyl acrylates 2 with hydrazine gives 3-hydroxy-5-per(poly)fluoroalkyl pyrazoles 3 in excellent yield. The effect of halogens on the pert polyfluoroalkyl chain and the reaction conditions were studied.
New one-pot synthesis of 4-hydroxyimino-5-polyfluoroalkylpyrazol-3-ones, their structure and biological activity
作者:Yanina V. Burgart、Natalya A. Agafonova、Evgeny V. Shchegolkov、Vera V. Maslova、Galina A. Triandafilova、Sergey Yu. Solodnikov、Olga P. Krasnykh、Victor I. Saloutin
DOI:10.1007/s10593-019-02418-4
日期:2019.1
synthesis of 4-hydroxyimino-5-polyfluoroalkylpyrazol-3-ones. The simplest and most convenient procedure relies on sequential one-pot treatment of polyfluoroalkyl-3-oxoesters with hydrazine and sodiumnitrite in aceticacid. It was established that 4-hydroxyimino-5-polyfluoroalkylpyrazol-3-ones exist in solid state and in solutions as mixtures of Z,Е-isomers of the hydroxyimine tautomer. The synthesized compounds