Potassium carbonate (K2CO3), sodium bicarbonate (NaHCO3), and OVS were purchased from Alfa Aesar. 4-Bromobenzoyl bromide, hydrazine monohydrate (NH2NH2·H2O), methanol (MeOH), thiophene (Th), 1,4-dioxane (DO), tetrahydrofuran (THF), acetone, and DMF were procured from Acros. Benzeneboronic acid [PhB(OH)2], palladium tetrakis(triphenylphosphine) [Pd(PPh3)4], copper iodide (CuI), and Et3N were obtained from Sigma–Aldrich (Darmstadt, Germany).
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