Yellow solid. Yield: 78%. 1H-NMR (400 MHz, CDCl3) δ 11.00 (s, 1H), 8.97 (s, 1H), 8.75 (d, J = 4.9 Hz, 1H), 8.54 (d, J = 7.8 Hz, 1H), 8.03–7.96 (m, 2H), 7.18 (d, J = 1.3 Hz, 1H), 7.08 (dd, J = 8.2, 1.4 Hz, 1H), 4.42 (t, J = 7.1 Hz, 2H), 1.39 (t, J = 7.1 Hz, 3H); 13C-NMR (100 MHz, DMSO-d6) δ 168.65 (s), 160.55 (s), 149.08 (s), 147.40 (s), 143.80 (s), 134.98 (s), 134.20 (s), 130.73 (s), 124.11 (s), 117.99 (s), 115.39 (s), 112.60 (s), 61.45 (s), 13.99 (s); Rf = 0.4 (33% EtOAc in Hex). mp: 162~164 °C (dec.). MS (ESI) m/z 244 [M+H]+. HRMS [M+H]+ C14H14NO3 calcd for 244.0963 found 244.0960.
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