Nitric Acid → HCID 58136884, compound

Participants

Reaction Conditions

Reaction Steps

5,6-Diethoxypyridazin-3-ylamine (analogously to T. Horie in Chemical & Pharmaceutical Bulletin (1963), 11(9), 1157-67; 160 mg) was initially charged dissolved in concentrated sulfuric acid (4 ml) at RT. The mixture was then cooled to 0° C. and 2 ml of a 1:1 mixture of concentrated nitric acid and concentrated sulfuric acid were added dropwise. After 20 min at 0° C., the ice bath was removed and the mixture was stirred for 4 h. Then it was cooled again to 0° C., a further 0.5 ml of the acid mixture was added and the mixture was stirred at 0° C. for another hour. Then it was admixed with ice while cooling with ice. After adding DCM, the phases were separated and extracted three times with DCM. The combined DCM phases were dried over sodium sulfate, filtered and concentrated. 188 mg of the title compound were obtained. LC-MS rt: 0.81 min [M+H]+: 236.2 (met. b)

Provenance & Evidence