Methylamine → (R)-1-(4-Nitro-phenyl)-pyrrolidine-2-carboxylic acid methylamide

Participants

Reaction Steps

To (R)-1-(4-Nitro-phenyl)-pyrrolidine-2-carboxylic acid (Method 55; 1.8 g, 7.6 mmol) in DCM (50 ml) was added HATU (3.2 g, 8.4 mmol) and DIPEA (2.0 ml, 11.4 mmol). The reaction was stirred for 10 minutes before the addition of methylamine (2.0 N in THF, 5.0 ml, 15 mmol); the reaction was stirred for 1 hour before being quenched with water (50 ml). The reaction was extracted with DCM (3×100 ml), dried and solvent removed in vacuo to yield a yellow gum. Purification was achieved via column chromatography eluting with 20% EtOAc/isohexane, 60% EtOAc/isohexane and finally 100% EtOAc. The title compound was obtained as an orange gum; (1.4 g, 74%). NMR (299.954 MHz, CDCl3) 8.10 (d, 2H), 6.56 (d, 2H), 6.24 (s, 1H), 4.20 (t, 1H), 3.75 (t, 1H), 3.40 (q, 1H), 2.80 (d, 3H), 2.36-2.29 (m, 2H), 2.13-2.05 (m, 2H); m/z 250.

Provenance & Evidence