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- W4311460070 abstract "We presented a general approach for synthesizing isoxazole-containing pyrazolines and pyrazoles. The protocol involved [3 + 2] cycloaddition of the in situ generated nitrile imines with 3-methyl-4-nitro-5-alkenyl isoxazoles furnishing a sequence of trans-configured isoxazole-substituted pyrazolines in a fully regioselective manner. Elimination/aromatization of the prepared cycloadducts with the catalysis of MnO2 or SnCl2 provided a facile access to the poly-substituted pyrazoles. By controlling the catalysts, the aromatization process either led to isoxazole-substituted pyrazoles (MnO2) or 1,3,4-triarylpyrazoles (SnCl2) with excellent selectivity. Additionally, the approach permitted the synthesis of isoxazole-substituted pyrazoles via a one-pot operation." @default.
- W4311460070 created "2022-12-26" @default.
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- W4311460070 date "2023-01-01" @default.
- W4311460070 modified "2023-09-29" @default.
- W4311460070 title "Synthesis of novel isoxazole-containing pyrazolines and pyrazoles via cycloaddition and elimination/aromatization process" @default.
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- W4311460070 doi "https://doi.org/10.1016/j.tet.2022.133203" @default.
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