“…The mixture was stirred at room temperature for 5 min followed by the addition of CuI (0.0676 g, 0.3 mmol). After being stirred at room temperature for 12 h as monitored by TLC, the resulting suspension was filtered under vacuum, concentrated and purified by column chromatography on silica gel (petroleum ether/ethyl acetate=60/1) to afford 7b as an oil; yield: 5.4148 g (88%). 1 H NMR (400 MHz, CDCl 3 ): δ =7.25 (dd, J 1 =7.6 Hz, J 2 =1.2 Hz, 1 H, ArH), 7.10–7.04 (m, 1 H, ArH), 6.70–6.63 (m, 2 H, ArH), 4.16 (bs, 2 H, NH 2 ), 2.36 (d, J =6.4 Hz, 2 H, CH 2 ), 1.98–1.87 (m, 1 H, CH), 1.05 (d, J =6.8 Hz, 6 H, 2×CH 3 ); 13 C NMR (100 MHz, CDCl 3 ): δ =147.6, 132.0, 128.7, 117.8, 114.1, 109.0, 94.6, 77.8, 28.8, 28.2, 22.0; MS (%): m / z =173 (M + , 49.5), 130 (100); IR (neat): ν =3473, 3377, 3028, 1612, 1572, 1492, 1455, 1426, 1384, 1367, 1343, 1305, 1263, 1245, 1157 cm −1 .…”