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Beilstein J. Org. Chem. 2021, 17, 2417–2424, doi:10.3762/bjoc.17.158
Graphical Abstract
Scheme 1: Synthesis of 5–arylethynyl-3-aryl-1,2,4-oxadiazoles 3a–e.
Scheme 2: Plausible reaction mechanism for transformations of 5-acetylenyl-1,2,4-oxadiazoles 3 in Brønsted su...
Scheme 3: Quantitative formation of E/Z-vinyl triflates 4a–c from 5-acetylenyl-1,2,4-oxadiazoles 3a–c in TfOH....
Scheme 4: Formation of compound 4d from 5-acetylenyl-1,2,4-oxadiazole 3a in H2SO4.
Scheme 5: Hydroarylation of 5-acetylenyl-1,2,4-oxadiazole 3a–d by arenes in TfOH leading to compounds E/Z-5a–g...