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- W2089771630 abstract "4-Acetyl-5-methyl-1-phenyl-1H-pyrazole reacts with dimethylformamide dimethylacetal (DMF-DMA) to afford the corresponding (E)1-(5-methyl-1-phenyl-1H-pyrazol-4-yl)-3-(N,N-dimethylamino)-2-propen-1-one. The latter product undergoes regioselective 1,3-dipolar cycloaddition with nitrilimines and nitrile oxides to afford the novel 3-aroyl-4-(5-methyl-1-phenyl-1H-pyrazol-4-yl)carbonyl-1-phenylpyrazole and 3-aroyl-4-(5-methyl-1-phenyl-1H-pyrazol-4-yl)carbonyl isoxazole derivatives, respectively. It reacts also with 1H-benzimidazole-2-acetonitrile, 2-aminobenzimidazole and 3-amino-1,2,4-triazole to afford the novel pyrido[1,2-a]benzimidazole, pyrimido[1,2-a]benzimidazole and the triazolo[4,3-a]pyrimidine derivatives, respectively. The reaction of 3-aroyl-4-(5-methyl-1-phenyl-1H-pyrazol-4-yl) carbonyl-1-phenylpyrazole derivatives with hydrazine hydrate led to a new pyrazolo[3,4-d]pyridazine derivatives." @default.
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- W2089771630 date "2008-11-01" @default.
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- W2089771630 title "Synthesis of novel pyrazolo[3,4-<i>d</i>]pyridazine, pyrido[1,2-<i>a</i>]benzimidazole, pyrimido[1,2-<i>a</i>]benzimidazole and triazolo[4,3-<i>a</i>]pyrimidine derivatives" @default.
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- W2089771630 doi "https://doi.org/10.1002/jhet.5570450627" @default.
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