反应详情

温度

20 °C

To N-Boc-(2S,3S)-3-hydroxypyrrolidine-2-carboxylic acid (1.36 g) in DMF (6 ml) added ammonium bicarbonate (0.5 g) and dicyclohexylcarbodiimide (1.3 g). After stirring at 20° C. for 20 h the reaction was concentrated by evaporation under reduced pressure, and the residue triturated with ethyl acetate. The soluble material was purified by chromatography on silica eluting with 50–100% (5% acetic acid in diethyl ether) in hexane to give the title material as a colourless gum, (0.5 g). NMR (CD3OD) major rotamer:1.43, (s, 9H), 1.88 (m, 1H), 2.0 (m, 1H), 3.55 (m, 2H), 4.03(s, 1H), 4.31 (bs, 1H); minor rotamer:1.47, (s, 9H), 1.7 (m, 1H), 2.0 (m, 1H), 3.55 (m, 2H), 4.09(s, 1H), 4.34 (d, J=4 Hz, 1H).

1. concentrationwas concentrated by evaporation under reduced pressure
2. customthe residue triturated with ethyl acetate
3. customThe soluble material was purified by chromatography on silica eluting with 50–100% (5% acetic acid in diethyl ether) in hexane