3-Chloro-6-methylpyridazine → HCID 24967301, compound

Participants

Reaction Conditions

Reaction Steps

2-Quinolin-6-yl-propionic acid hydrazide (intermediate 63) (500 mg, 2.32 mmol) was added to a stirred solution of 3-chloro-6-methylpyridazine (299 mg, 2.32 mmol) in n-butanol. The reaction mixture was heated at 120° C., overnight. The volatiles were removed in vacuo and the residue absorbed onto silica gel and purified by flash chromatography (SiO2, CH2Cl2:CH3OH 100:0-90:10) to obtain 6-[1-(6-methyl-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)-ethyl]-quinoline (356 mg, 53% yield). To 6-[1-(6-methyl-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)-ethyl]-quinoline (356 mg, 1.23 mmol) was added a dropwise solution of bromine (1.73 uL, 3.69 mmol) in acetic acid (3 mL). The reaction was heated at 100° C. for 2 hours. The reaction mixture was cooled to room temperature and the solvent removed in vacuo. A solution of 10% aq. NaSH (10 mL) was added and the product extracted with 10% methanol in dichloromethane. The organic phase was washed with 5% aqueous sodium sulfite. The filtrate was then concentrated in vacuo onto silica gel and purified by flash chromatography (SiO2, CH2Cl2:CH3OH 100:0-90:10) to return the title compound (168 mg, 37% yield). Analytical data presented in Table 1.

Provenance & Evidence