“…This compound was prepared in 80% yield as a colorless solid by following Method B: mp 122–124 °C (lit20 mp 122–123 °C). IR (KBr) 1644, 1593, 1478, 1459, 1437, 1398, 1263 cm −1 ; 1 H NMR (CDCl 3 , 300 MHz) δ 6.98 (d, J = 8.7 Hz, 1 H), 6.58 (d, J = 8.7 Hz, 1 H), 6.41 (s, 1 H), 3.80 (s, 3 H), 3.79 (s, 3 H), 3.77 (s, 3 H), 2.55 (s, 3 H); 13 C NMR (CDCl 3 , 75 MHz) δ 163.8, 152.7, 147.4, 143.2, 133.9, 121.9, 115.4, 104.1, 57.8, 55.8, 36.0, 25.1; EIMS ( m/z , relative intensity) 233 (M + , 52), 218 (100), 203 (38), 190 (34), 175 (68), 147 (14), 132 (10), 118 (12), 91 (8), 77 (7); HRMS calcd for C 13 H 15 NO 3 233.1052, found 233.1056.…”