Mannich Bases as Synthetic Intermediates: Synthesis of 3- and 4-Functionalized 2-Pyrazolines
作者:Elsayed M. Afsah、Ez-el-Din M. Kandeel、Mona M. Khalifa、Waleed M. Hammouda
DOI:10.1515/znb-2007-0409
日期:2007.4.1
The reaction of styryl ketonic Mannich bases 2a - c with phenylhydrazine leads to 3-functionalized 2-pyrazolines 4 or 6 depending on the reaction conditions. 3-[β -(Arylamino)ethyl]-2-pyrazolines 8a,b were obtained via transamination between the methiodide salt 7 and primary arylamines. Treatment of 1-(p-anisyl)-1,2,5-tri(N-piperidino)pentan-3-one (11) with phenylhydrazine affords the 3,4-difunctionalized
取决于反应条件,苯乙烯基酮曼尼希碱 2a-c 与苯肼的反应产生 3-官能化的 2-吡唑啉 4 或 6。3-[β-(芳氨基)乙基]-2-吡唑啉8a,b通过甲硫氨酸盐7和芳基伯胺之间的氨基转移获得。用苯肼处理 1-(p-anisyl)-1,2,5-tri(N-piperidino)pentan-3-one (11) 得到 3,4-双官能化的 2-吡唑啉 12。 酮碱的反应19或21与肼导致4-官能化的2-吡唑啉20和22,N-曼尼希碱23和24从22a获得。3-[β-(苯硫基)乙基]-2-吡唑啉28a,b的合成是通过用苯肼处理26或27来实现的。