“…Other bases, including KF, Li 2 CO 3 , CsOAc, K 2 CO 3 , K 3 PO 4 , t-BuOK, LiOH, and NaOH, were less efficient ( Table 1, entries 2-10). Among the copper sources used (e.g., CuOTf, CuBr, CuCl, Cu(OTf) 2 , Cu(OAc) 2 , CuBr 2 , CuCl 2 , and CuO), CuCl exhibited the highest catalytic reactivity (91% yield, Table 1, entries [10][11][12][13][14][15][16][17]. No reaction occurred when the procedure was carried out in the absence of copper catalyst (Table 1, entry 18).…”