反应详情

To a stirred mixture of tert-butyl 4-isobutyrylpiperazine-1-carboxylate (6.8 g, 26.5 mmol) in methanol (15 mL) was added hydrochloride/methanol (30 mL, 3M)) at 0° C. After the addition, the mixture was allowed to stir at room temperature overnight. The mixture was concentrated to give 2-methyl-1-(piperazin-1-yl)propan-1-one (5.5 g, yield 100%) as an off-white solid. 1H-NMR (400 MHz, DMSO-d6) δ (ppm): 0.99-1.00 (d, J=6.4 Hz, 6H), 2.84-2.89 (m, 1H), 3.03-3.07 (d, 4H), 3.68-3.74 (d, 4H), 9.58 (s, 2H); LC-MS (ESI) m/z: 157(M+1)+.

1. additionAfter the addition
2. concentrationThe mixture was concentrated