... in various solvents such as CH 3 CN, MeO-t-Bu, CH 3 NO 2 , C 6 H 5 CH 3 , (CH 2 Cl) 2 , and CH 2 Cl 2 , at 25 °C for 30 min (Table 1). The optimum conditions were found to be using 1 mol % of Hg(OTf) 2 and CH 2 Cl 2 giving rise to indoline 6 8 in 96% yield (Table 1, entry 10). ...