Synthesis and reaction of 1-(N,N-disubstituted amino)pyrazoles.
作者:SHOJI KISHIMOTO、SHUNSAKU NOGUCHI、KATSUTADA MASUDA
DOI:10.1248/cpb.24.3001
日期:——
Some 1-(N, N-disubstituted amino) pyrazoles were synthesized by 1, 3-dipolar cyclo-addition of 3-(N, N-disubstituted amino) sydnones with acetylenes. Arylacetylenes gave 3-arylpyrazoles preferentially. The structures were determined by ultraviolet and nuclear magnetic resonance spectroscopy, and further confirmed by catalytic hydrogenolysis and mass spectroscopy. Nitration and halogenation of 3-phenyl-1-aminopyrazoles occurred smoothly at C-4 first and at C-5 subsequently.
一些 1-(N,N-二取代氨基)吡唑是通过 3-(N,N-二取代氨基)茚酮与乙炔的 1,3-二极环加成法合成的。芳基乙炔优先得到 3-芳基吡唑。通过紫外光谱和核磁共振光谱确定了这些化合物的结构,并通过催化氢解和质谱进一步证实了这些结构。3- 苯基-1-氨基吡唑的硝化和卤化反应首先在 C-4 处顺利进行,然后在 C-5 处进行。