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Reagents and conditions: (a) (i) (COCl)2, DMF (cat.), CH2Cl2, 0 °C, 2 h; (ii) ArCOCl, Et3N, 3-aminopiperidine-2,6-dione hydrochloride, CH2Cl2, 0 °C, to rt, 18 h; (b) Pd/C, H2, DMF, rt, 18 h; (c) Fe, EtOH, AcOH, H2O, 110 °C, 30 min.
