Cyanogen Bromide → HCID 58136948, compound

Participants

Reaction Steps

(5,6-Diethoxy-pyridazin-3-yl)hydrazine (W3.120; 50 mg) was initially charged in a mixture of ethanol (3.5 ml) and water (0.75 ml) at RT while stirring. Thereafter, cyanogen bromide (55 mg, dissolved in 0.75 ml of ethanol and 0.15 ml of water) was cautiously added dropwise. After stirring for 7 h, the mixture was left to stand overnight. Thereafter, a further 2 equivalents of cyanogen bromide, dissolved in 0.75 ml of ethanol and 0.15 ml of water, were added and the mixture was stirred further at RT for 2 h and then at 55° C. for 8 h. After cooling, the solvent was drawn off and the residue was admixed with water. After it had been alkalized with saturated potassium carbonate solution, it was extracted four times with dichloromethane. The combined organic phases were dried over sodium sulfate and, after the desiccant had been filtered off, dried under reduced pressure. The residue was purified by means of preparative HPLC (met. A). The clean product fractions were combined, freed of the acetonitrile under reduced pressure, alkalized with saturated potassium carbonate solution and extracted four times with dichloromethane. The combined organic phases were dried over sodium sulfate and, after the desiccant had been filtered off, dried under reduced pressure. 36 mg of the title compound were obtained.

Provenance & Evidence