Dimethylformamide → HCID 20474277, compound

Participants

Reaction Steps

15.6 g (50.0 mmols) of 3-acetylamino-7-(4-ethyl-5-methyl-2H-1,2,3-triazol-2-yl)-coumarin are suspended in 100 ml of anhydrous dimethylformamide. 11.5 g (75.0 mmols) of phosphorus oxychloride are added dropwise to the suspension at 10°-15° C., and the mixture is stirred for 22 hours at room temperature. The slurry is introduced into 500 ml of ice water, and the mixture is filtered and brought to a pH of 8 with sodium carbonate. The yellow crystals are filtered off under suction, washed with water and dried: 15.5 g (95.5%). Recrystallisation from ethanol yields 12.9 g (80%) of 3-(dimethylaminomethyleneamino)-7-(4-ethyl-5-methyl-2H-1,2,3-triazol-2-yl)-coumarin in the form of small pale yellow crystals of melting point 158°-159° C.

Provenance & Evidence