反应详情

To a solution of methyl 4-(3-tert-butoxy-3-oxoprop-1-enyl)-1H-pyrrole-2-carboxylate (2.0 g, 7.96 mmol) in EtOAc (20 mL) under nitrogen was added 10% Pd/C. The flask was evacuated and refilled with hydrogen three times. The reaction mixture was stirred for 2 h. The catalyst was removed by filtration through Celite and the filtrate was concentrated to give methyl 4-(3-tert-butoxy-3-oxopropyl)-1H-pyrrole-2-carboxylate as a white solid (2.02 g, 100%). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.43 (s, 9H), 2.48 (t, J=7.59 Hz, 2H), 2.77 (t, J=7.54 Hz, 2H), 3.84 (s, 3H), 6.77 (dd, J=2.37, 1.93 Hz, 2H), 930 (br s, 1H); LCMS-MS (ESI+) 198.2 (M-isobutylene).

1. customThe flask was evacuated
2. additionrefilled with hydrogen three times
3. customThe catalyst was removed by filtration through Celite
4. concentrationthe filtrate was concentrated