Reaction Steps
To a solution of the product from Step 3 (0.5 g, 0.9 mmol) in methylene chloride (20 mL) was added 2N HCl in ether (2 mL). The mixture stirred for 16 h at ambient temperature. The precipitated product was isolated by filtration, and was rinsed with methylene chloride (20 mL) and dried under vacuum, providing 0.4 g of 1-((2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-5-yl)methyl)-3-(4-hydroxy-3-methylphenyl)urea as an off-white solid, in quantitative yield; HPLC: Waters Symmetry C18, 5 μm, 3.9×150 mm, 1 ml/min, 240 nm, 30/70 CH3CN/0.1% H3PO4, 1.88 min (96.94%); mp 210-212 0C; 1H NMR (DMSO-d6) δ 1.94-2.18 (m, 4H), 2.30-2.51 (m, 1H), 2.58-2.72 (m, 1H), 2.87-3.06 (m, 1H), 4.25-4.56 (m, 4H), 5.15 (dd, J=5.0, 13.3 Hz, 1H), 6.67 (d, J=8.5 Hz, 1H), 7.02 (dd, J=2.5, 8.6 Hz, 1H), 7.12 (d, J=2.3 Hz, 1H), 7.47 (d, J=7.7 Hz, 1H), 7.54 (s, 1H), 7.73 (d, J=7.7 Hz, 1H), 8.32 (br. s., 1H), 11.02 (s, 1H); 13C NMR (DMSO-d6) δ 16.15, 22.51, 31.20, 42.77, 47.12, 51.56, 114.47, 117.11, 121.32, 121.83, 122.88, 123.61, 126.86, 130.22, 131.72, 142.35, 145.17, 150.10, 155.58, 170.99, 172.85; LCMS MH=423; Anal. Calcd for C22H22N4O5+0.25CH2Cl2: C, 60.23; H, 5.11; N, 12.63. Found: C, 60.14; H, 5.43; N, 12.54.
