Features of the reaction of 4-bromobut-2-enylphosphonium salts with monosubstituted hydrazines
作者:M. Zh. Ovakimyan、G. Ts. Gasparyan、M. R. Grigoryan、A. S. Bichakhchyan
DOI:10.1134/s1070363214030141
日期:2014.3
(4-Bromobut-2-en-1-yl)triphenylphosphonium bromide reacted with phenylhydrazine at 2A degrees C in the presence of sodium carbonate to form triphenyl[4-(2-phenylhydrazinylidene)but-2-en-1-yl]phosphonium bromide in 62% yield. The obtained N-phenylhydrazine derivatives cyclized into the corresponding pyrazoline derivatives of phosphonium salts. Unlike phenylhydrazine, ethylhydrazine reacted with (4-bromobut-2-ene-1-yl)triphenylphosphonium bromide under the same conditions to afford triphenyl[(1-ethyl-4,5-dihydro-1Hpyrazol-3-yl)methyl]- and -[(1-ethyl-1H-pyrazol-3-yl)methyl]phosphonium bromides in yields of 60 and 40%.
(4-溴丁-2-烯-1-基)三苯基磷钾溴化物在碳酸钠的存在下与苯基肼于2A°C发生反应,生成62%收率的三苯基[4-(2-苯基亚肼基)丁-2-烯-1-基]磷钾溴化物。所获得的N-苯基肼衍生物环化为相应的吡唑啉磷钾盐衍生物。与苯基肼不同,乙基肼在相同条件下与(4-溴丁-2-烯-1-基)三苯基磷钾溴化物反应,分别以60%和40%的收率得到三苯基[(1-乙基-4,5-二氢-1H吡咯-3-基)甲基]磷钾溴化物和三苯基[(1-乙基-1H吡咯-3-基)甲基]磷钾溴化物。