“…1 H NMR (400 MHz, CDCl 3 ) δ 7.15 (d, 2H, J = 6.8 Hz), 7.34 (d, 2H, J = 6.8 Hz), 3.49–3.46 (m, 1H), 3.29–3.21 (m, 1H), 2.78 (dd, 1H, J = 13.2, 5.8 Hz), 2.67 (dd, 1H, J = 13.2, 78 Hz), 1.51 (brs, 2H), 1.15 (d, 3H, J = 6.3 Hz); 13 C{ 1 H} NMR (100 MHz, CDCl 3 ) δ147.2, 146.1, 129.7, 123.1, 47.9, 45.4, 22.6 (several signals overlapped); IR (neat) 3361, 3292, 3108, 3076, 2963, 2929, 1599, 1517, 1346 cm –1 ; HRMS (ESI) m / z : [M + H] + calcd for C 9 H 13 N 2 O 2 , 181.0972; Found, 181.0977; [α] D 20 + 19.8 ( c 1.05, H 2 O); lit . [α] D 23 + 19.3 (c 2.54, H 2 O).…”