Dimethylformamide → HCID 68513053, compound

Participants

Reaction Steps

To a suspension of the compound (1.37 g) obtained in Example 188 (2) in methylene chloride (50 mL) were added oxalyl chloride (800 μL) and DMF in catalytic amount under ice-cooling, and the mixture was stirred at room temperature for 1.5 hr. After concentration under reduced pressure, methylene chloride (8 mL) was added to the residue. Under ice-cooling, the solution was added dropwise to a mixture of the above-mentioned compound (760 mg) in THF (50 mL) and 4-dimethylaminopyridine (1.71 g). After stirring at room temperature for 17 hr, dilute hydrochloric acid (100 mL) was added, and the mixture was extracted with ethyl acetate (100 mL×2). The organic layer was concentrated under reduced pressure, and the residue was purified by silica gel chromatography to give the title compound (1.67 g) as a white solid.

Provenance & Evidence