N-bromobutanimide → HCID 135738546, compound

Participants

Reaction Steps

A solution of N-bromosuccinimide (1.0 g, 0.0056 mol) in DMF (10 ml) was added dropwise to a stirred solution of 6-(2-ethoxyphenyl)-1-n-propyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one (Example 1; 0.84 g, 0.0028 mol) in DMF (10 ml) and the resulting red solution stirred for 20 hours. The solvent was removed by evaporation under vacuum and the residue partitioned between saturated aqueous sodium bicarbonate solution (20 ml) and ethyl acetate (20 ml). The organic phase was removed and the aqueous phase extracted with ethyl acetate (3×30 ml). The combined organic solutions were dried and the solvent removed by evaporation under vacuum to give an orange crystalline solid. Recrystallisation from ethyl acetate-hexane gave the title compound as colourless crystals (0.812 g, 78%), m.p. 172-173° C. Found: C,51.13; H,4.41; N,14.84. C16H17BrN4O2 requires C,50.94; H,4.54; N,14.85%.

Provenance & Evidence