Water → 3-((2-(Methylthio)benzo[d]thiazol-6-yl)methyl)imidazo[1,2-b]pyridazine-6-carbonitrile

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Reaction Steps

A stirred mixture of 2-chloro-3-(2-(methylthio)benzo[d]thiazol-6-yl)propanal from Step 4 of Example 117 (1.3 g, 4.8 mmol) and 6-aminopyridazine-3-carbonitrile (0.8 g, 7.2 mmol) in 1-butanol (48 mL) was heated at reflux overnight. The mixture was cooled to rt and water (100 mL) was added. The mixture was extracted with EtOAc (3×60 mL, and the combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 50:1 to 20:1 DCM/MeOH to afford 3-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)imidazo[1,2-b]pyridazine-6-carbonitrile as a yellow solid (0.7 g, 44%). 1H NMR (300 MHz, CDCl3) δ 8.09 (d, J=9.0 Hz, 1H), 7.83-7.78 (m, 2H), 7.69 (s, 1H), 7.36 (d, J=8.4 Hz, 1H), 7.29 (d, J=9.3 Hz, 1H), 4.46 (s, 2H), 2.78 (s, 3H). LCMS (ESI) m/z 338 (M+H)+.

Provenance & Evidence