“…Furthermore, diverse catalysts were reported to accelerate the reaction. This included Brønsted acids, such as acetic acid [16], perchloric acid [14][15][16], tosylic acid [54], silicasulfuric acid [55], NH 4 Cl [50,56], clay (montmorillonite K-10) [57] and PTSA/N -hydroxysuccinimide [58]. Additionally, several Lewis acids were used, such as Sc(OTf) 3 [14][15][16], MgCl 2 [59], InCl 3 [60], ZnCl 2 [61], RuCl 3 [62], tin(II) chloride dehydrate [63], trimethylsilyl chloride (TMSCl) [65] and Yb(OTf) 3 [66].…”