Cyanogen Bromide → HCID 58136913, compound

Participants

Reaction Steps

(6-Chloro-5-isopropylpyridazin-3-yl)hydrazine trifluoroacetic acid salt (W3.013; 400 mg) was initially charged in ethanol/water (6/1 ml) at RT while stirring. Thereafter, cyanogen bromide (353 mg, dissolved in a mixture of 1 ml of EtOH and 0.5 ml of water) was cautiously added dropwise. After stirring for 5 hours, the mixture was left to stand overnight and stirred for a further day. After standing overnight, the solvent was drawn off and the residue was admixed with water. Once the residue had been alkalized with saturated potassium carbonate solution, it was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulfate and, after filtering off the desiccant, dried under reduced pressure. 400 mg of the title compound were obtained in sufficient purity.

Provenance & Evidence