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Thermally initiated cycloaddition reactions of nonsymmetrical allenyl azines 1 with alkynes or other dipolarophiles usually lead to compounds with three fused, five‐membered heterocyclic rings. With alkynes with pronounced “push–pull” systems, however, the reaction ends with the formation of substituted pyrrolidino[1,2‐b]pyrazoles 4 and, in the case of azines with trifluoromethyl substitution, ring...
A new approach to five-membered cyclic nitrones connected with the incorporation of a planar aromatic ring system into the structure is described. This procedure is based on an allenyloxime one-pot domino transformation under simple base catalysis in alcoholic and aqueous solvents. The structure of obtained nitrones was studied by X-ray analysis and the reactivity of products in 1,3-dipolar cycloadditions...
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