N-bromobutanimide → HCID 59333304, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 4-chloro-7-(trifluoromethoxy)imidazo[1,2-a]quinoxaline (5.4 g, 18.8 mmol, 1 eq) prepared as described in example 7 step 4 in dichloromethane (94 mL) is added N-bromosuccinimide (5.0 g; 28.2 mmol; 1.5 eq). The solution becomes green during the addition. The solution is allowed to stir for 7 hours at 30° C. until completion of the reaction. Then, the solution is concentrated under vacuum and purified by chromatography on a silica gel column (chloroform/cyclohexane 7:3) to afford the title compound still contaminated by 10% of residual N-bromosuccinimide (7.2 g; 17.7 mmol; 94%). The compound is used as such in the next step without further purification.

Provenance & Evidence