Dimethylformamide → HCID 67222560, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of (R,R)-2,3-bis(acetyloxy)-butanedioic acid mono tert-butyl ester (3.25 g: Tetrahedron, 45, 3071-3080, 1989) in CH2Cl2 (65 mL), were added oxalyl chloride (1.06 mL) and DMF (50 microL) at 0° C. The reaction mixture was stirred at 0° C. for 30 minutes then pyridine (3.82 mL) was added into the mixture at the same temperature. The reaction mixture was stirred at the same temperature for 5 minutes. To the mixture, was added a solution of compound 54-2 (2.5 g) in CH2Cl2 (12.5 mL) at 0° C. The mixture was stirred for 1 hour at the same temperature. Then the mixture was concentrated in vacuo and the resulting residue was suspended in water. The mixture was extracted with EtOAc and the organic layer was washed with 1N HCl aq., sat. NaHCO3 aq., brine, and it was dried with anhyd. Na2SO4. The solvent was removed under reduced pressure to obtain compound 54-3 (5.7 g) as brown oil.

Provenance & Evidence