反应详情

A mixture of (2S,4S)-2-benzyl 1-tert-butyl 4-ethylpyrrolidine-1,2-dicarboxylate (18 g, 54.1 mmol), Pd/C (3.6 g) in MeOH (1 L) was hydrogenated at room temperature overnight. TLC showed that the reaction was completed. The mixture was filtered by Celite. The filtrate was concentrated to afford (2S,4S)-1-(tert-butoxycarbonyl)-4-ethylpyrrolidine-2-carboxylic acid (10 g, 77%) as white solid. 1H NMR: 400 MHz CDCl3: δ 9.88 (br, 1H), 4.31-4.19 (m, 1H), 3.82-3.68 (m, 1H), 3.03-2.95 (m, 1H), 2.49-2.39 (m, 1H), 2.12-2.03 (m, 1H), 1.81-1.56 (m, 1H), 1.45 (d, J=8 Hz, 11H), 0.92 (t, J=6 Hz, 3H).

1. filtrationThe mixture was filtered by Celite
2. concentrationThe filtrate was concentrated