Dimethylformamide → HCID 18998721, compound

Participants

Reaction Conditions

Reaction Steps

DMF (5 ml) was added dropwise to 5 ml of phosphorus oxychloride with cooling. To the solution was added dropwise 40 ml of a solution of 7.0 g of Compound 37-a in DMF, followed by stirring at 70° C. for 6 hours. The reaction mixture was poured onto ice, and extracted with ethyl acetate. The organic layer was washed with a saturated aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography [eluent: hexane/ethyl acetate (2/1)] to give 5.83 g (75%) of the product as a yellow amorphous solid.

Provenance & Evidence