“…After filtration and concentration under reduced pressure, the residue was purified by filter flash chromatography (petroleum ether/ethyl acetate 80:20) to give rac ‐ 19 in 97 % yield (1.36 g, 7.67 mmol) as yellow–brownish oil. Spectroscopic data are full in agreement with those reported in literature 29 . 1 H NMR (600 MHz, CDCl 3 ): δ =3.75 (dd, J =9.6, 9.6 Hz, 1 H, 2‐H a ), 3.77 (s, 3 H, COOMe), 3.94 (dd, J =9.6, 7.5 Hz, 1 H, 2‐H b ), 4.20 (dd, J =9.6, 7.5 Hz, 1 H, 3‐H), 6.67 (d, J =7.8 Hz, 1 H, arom.‐H), 6.75 (dt, J =1.0, 7.5 Hz, 1 H, arom.‐H), 7.09 (m, 1 H, arom.‐H), 7.30 ppm (ddt, J =0.6, 1.2, 7.5 Hz, 1 H, arom.‐H); 13 C NMR (151 MHz, CDCl 3 ): δ =47.2 (C‐3), 49.3 (C‐2), 52.3 (COO Me ), 110.1, 119.0, 125.2 (arom.‐CH), 126.0 (arom.‐C ipso ), 128.8 (arom.‐CH), 151.1 (arom.‐C ipso ), 172.7 ppm (CO); IR (ATR film): $\tilde \nu $ =3376 (NH), 2951, 2881, 1727 (CO), 1604, 1488, 1464, 1434, 1316, 1251, 1196, 1170, 1019, 745 cm −1 ; GC‐MS (EI, 70 eV): m / z (%): 177 (28) [ M + ], 118 (100) [C 8 H 8 N + ].…”