Cornforth reagent → (7aS)-2-(3,5-dichloro-phenyl)-tetrahydro-pyrrolo[1,2-c]imidazole-1,3,6-trione

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To a solution of (7aS,6R)-2-(3,5-dichloro-phenyl)-6-hydroxy-tetrahydro-pyrrolo[1,2-c]imidazole-1,3-dione (11.3 g) (0.038 mol) (Preparation 2), in 185 mL of DCM was added molecular sieves 3A (18 g) then PDC (33.5 g) (0.093 mol). The reaction mixture was stirred for 72 h at RT, then the insoluble material eliminated. After evaporating the solvent, the residue was purified by SiO2 chromatography (eluent: DCM/EtOAc 95/5) to afford the titled compound as a white solid (7.3). NMR (CDCl3, 200 MHz): 7.45-7.35 (3H, m), 4.65 (1H, dd), 4.25 (1H, dd), 3.12 (1H, dd), 2.97 (1H, dd), 2.65 (1H, dd).

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