반응 단계
To a suspension of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (1.10 g, 4 mmol) in THF (30 ml) was added benzyloxyacetyl chloride (1.26 ml, 8 mmol). The mixture was heated to reflux for 1.8 hours. The reaction was cooled to room temperature, methanol (2 ml) was added, and the mixture stirred for 1 hour. The solvent was evaporated in vacuo and the residue was slurried in diethyl ether (30 ml), filtered, recrystallized from a minimal amount of acetic acid, slurried in ethyl acetate (15 ml), and filtered to give 1.35 g (80%) of product: mp 204-206° C.; 1H NMR (DMSO-d6) d 11.20 (s, 1H), 10.40 (s, 1H), 8.71 (d, J=8.4 Hz, 1H), 7.86 (t, J=7.9 Hz, 1H), 7.64 (d, J=7.2 Hz, 1H), 7.50-7.28 (m, 5H), 5.17 (dd, J=5.0 and 12.5 Hz, 1H), 4.72 (s, 2H), 4.21 (s, 2H), 2.99-2.85 (m, 1H), 2.67-2.51 (m, 2H), 2.12-2.08 (m, 1H); 13C NMR (DMSO-d6) d 172.78, 169.78, 169.01, 168.27, 166.67, 137.04, 136.52, 135.93, 131.29, 128.36, 127.82, 124.40, 118.38, 116.08, 72.78, 69.23, 48.97, 30.92, 21.98; Anal. Calcd. For C22H19N3O6: C, 62.70; H, 4.54; N, 9.97. Found: C, 62.77; H, 4.54; N, 9.82.
