2-(1,2,3-Thiadiazol-5-yl)enamines and 3-(1,2,3-triazol-4-yl)enaminones react with arylhydroxamoyl chlorides at room temperature with the exclusive formation of 3-aryl-4-(1,2,3-thiadiazol-5-yl)- and [4-(1,2,3-triazol-4-yl)carbonyl]isoxazoles in high yields. The proposed mechanism includes in situ generation of nitrile oxides, which participate in the (3+2)-dipolar cycloaddition reactions leading to the formation of the isoxazole ring.
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Notes
Successively added methylamine hydrochloride (2.7 g, 40 mmol) and NaOH (1.2 g, 30 mmol) can be used as methylamine (2) source.
The assignment was done on the basis of the data of a 2D HMBC experiment.
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This work was supported financially by the Russian Foundation for Basic Research (grant 14-03-01033) and the Ministry of Education and Science of the Russian Federation (State assignment 4.1626.2014/K).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2016, 52(9), 743–749
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Efimov, I.V., Shafran, Y.M., Volkova, N.N. et al. Synthesis of Assemblies of Isoxazole and Azoles Based on 1,3-Dipolar Cycloaddition Reaction of Enamines with Nitrile Oxides. Chem Heterocycl Comp 52, 743–749 (2016). https://doi.org/10.1007/s10593-016-1958-8
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DOI: https://doi.org/10.1007/s10593-016-1958-8