“…63 Recent reports include catalysts such as (BaOTf) 2 , 64 l -proline, 65 Nano ZnO, 66 LCMNPs, 67 β-cyclodextrin, 68 amberlite IRA-400 Cl, 69 and Fe 3 O 4 @chitosan. 70 Similarly, for 3-amino alkylated indoles, recent reported methodologies include l -proline, 71 SDS, 72 iron( iii ) phosphate, 73 β-cyclodextrin, 74 PMA–SiO 2 , 75 silver triflate, 76 bromodimethylsulfonium bromide (BDMS), 77 PANI-HBF 4 , 78 ZrOCl 2 ·2H 2 O/CuCl 2 ·3H 2 O, 79 RGO/ZnO, 80 and cellulose sulfonic acid. 81 However, many of these methodologies are accompanied by several drawbacks such as expensive catalysts, usage of hazardous organic solvents, high temperatures, prolonged reaction times, huge organic waste, low product yield, and difficulty in the recovery and reuse of catalysts.…”