Reaction Steps
A mixture of 3-(benzofuran-2-ylmethoxy)-phthalic acid (0.55 g, 1.8 mmol) and rac-α-aminoglutarimide hydrochloride (0.30 g, 1.8 mmol) in pyridine (10 mL) was heated to reflux for 16 h. The mixture was cooled and evaporated under vacuum. The residue was dissolved in CH2Cl2 (100 mL) and washed with dilute aqueous HCl (2×100 mL) and water (2×100 mL) and was evaporated. The residue was chromatographed using a CH2Cl2-methanol gradient, eluting the title compound at 95:5 CH2Cl2-methanol, 0.46 g, in 65% yield; mp 234-236° C.; HPLC, Waters Symmetry C-18, 3.9×150 mm, 5 μm, 1 mL/min, 240 nm, 50/50 CH3CN/0.1% H3PO4, 4.16 (98.58%); 1H NMR (DMSO-d6) δ 1.99-2.04 (m, 1H), 2.43-2.61 (m, 2H), 2.81-2.95 (m, 1H), 5.08 (dd, J=12.7 Hz, J=5.3 Hz, 1H), 5.55 (s, 2H), 7.14 (s, 1H), 7.23-7.37 (m, 2H), 7.50 (d, J=7.0 Hz, 1H), 7.60 (d, J=8.1 Hz, 1H), 7.68 (d, J=7.5 Hz, 1H), 7.74 (d, J=8.5 Hz, 1H), 7.86 (t, J=7.8 Hz, 1H), 11.11 (s, 1H); 13C NMR (DMSO-d6) δ 23.9, 30.9, 48.8, 63.1, 107.4, 111.3, 115.9, 116.7, 120.2, 121.6, 123.1, 125.0, 127.5, 133.3, 137.0, 152.0, 154.6, 155.0, 165.2, 166.7, 169.9, 172.7; Anal. Calcd for C22H16N2O6.0.15H2O: C, 64.91; H, 4.04; N, 6.88. Found: C, 64.89; H, 3.99; N, 6.84.
