Methyl chloroglyoxylate → Methyl 2-[[2-(2,6-dioxo-3-piperidyl)-1,3-dioxo-isoindolin-4-yl]amino]-2-oxo-acetate

関与物質

反応手順

To a stirred suspension of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (0.55 g, 2.0 mmol) in THF (30 ml) was added methyl (chlorocarbonyl)formate (0.49 g, 4.0 mmol). The mixture was heated to reflux for 18 hours. The solvent was evaporated in vacuo and the resulting solid was slurried in diethyl ether (20 ml) and filtered to give 0.55 g (76%) of product as an off-white solid: mp 247–249° C.; 1H NMR (DMSO-d6) δ 11.17 (s, 1H), 10.81 (s, 1H), 8.59 (d, J=8.3 Hz, 1H), 7.92 (t, J=7.7 Hz, 1H), 7.70 (d, J=7.3 Hz, 1H), 5.19 (dd, J=5.0 and 12.5 Hz, 1H), 3.91 (s, 3H), 2.98–2.85 (m, 1H), 2.68–2.50 (m, 2H), 2.14–2.09 (m, 1H); 13C NMR (DMSO-d6) δ 172.70, 169.63, 168.03, 166.45, 159.81, 154.57, 136.65, 134.93, 131.36, 124.67, 119.34, 117.17, 53.80, 49.06, 30.92, 21.94; Anal. Calcd. For C18H13N3O7: C, 53.49; H, 3.65; N, 11.70. Found: C, 53.53; H, 3.66; N, 11.52.

情報源と証拠