Hydrochloric Acid → (6R,7aS)-2-(3,5-dichlorophenyl)-6-hydroxytetrahydro-1H-pyrrolo[1,2-c]imidazole-1,3(2H)-dione

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Reaction Steps

(4R)-1-{[(3,5-dichlorophenyl)amino]carbonyl}-4-hydroxy-L-proline (6.8 g) (0.021 mol) (Preparation 5) was combined with 35 mL of 1N HCl and refluxed for 11 hrs. The organic oil was separated from the reaction mixture and dissolved in EtOAc. The organic layer was washed with water, dried over MgSO4, and evaporated under reduced pressure. The resulting residue was purified on a SiO2 column (eluent: DCM/acetone-90/10) to afford the titled compound as a white solid (3.2 g). 1H NMR (CDCl3): 7.4 (2H,d), 7.35 (1H,m), 4.8 (1H,m), 4.60 (1H,dd), 3.98 (1H,dd), 3.35 (1H,d), 2.39 (1H,dd), 2.05 (1H,d,OH), 1.80–1.95 (1H,m).

Provenance & Evidence