Reaction Steps
A solution of AlCl3 (44 mg, 0.33 mmol) in anhydrous anisole (150 μl) was added to 32 (43 mg, 0.07 mmol) in anhydrous anisole (150 μl) and the resulting solution was stirred at room temperature for 18 hours. The reaction was diluted with MeOH (150 μl) and the solvent was concentrated. The residue was purified via column chromatography (SiO2, 80:20:1 EtOAc:Hexanes:MeOH) to give 33 as a yellow amorphous solid in quantitative yield: 1H NMR (CDCl3, 500 MHz) δ 8.35 (s, 1H), 7.74 (s, 1H), 7.58 (d, J=8.9 Hz, 1H), 7.52 (bs, 1H), 7.37 (m, 1H), 7.31 (m, 1H), 7.25-7.11 (m, 5H), 6.84-6.77 (m, 3H), 6.74 (d, J=8.6 Hz, 1H), 6.67 (d, J=7.6 Hz, 1H), 6.64 (s, 1H), 5.16 (s, 2H), 3.76 (s, 3H), 3.70 (s, 3H), 3.68 (s, 3H); 13C NMR (CDCl3, 125 MHz) δ 170.3, 159.4, 159.3, 158.0, 138.8, 135.5, 132.3, 130.4, 130.3, 130.1 (2C), 129.6, 129.1 (2C), 127.1, 123.0, 122.0, 114.9, 114.3 (2C), 113.3, 110.7, 55.8, 55.4, 53.9; IR (film) νmax 2926, 1601, 1506, 1248, 1177, 1030, 818 cm−1; HRMS (ESI+) m/z: [M+H]+ calcd for C32H28N2O5, 521.2076. found, 521.2030.
