3-Chloro-6-methylpyridazine → 2-(6-Methylpyridazin-3-ylamino)dibenzothiophene

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A mixture of 2-aminodibenzothiophene (0.90 g, 4.52 mM), 3-chloro-6-methyl-pyridazine (0.58 g, 4.52 mM), sodium t-butoxide (0.61 g, 6.33 mM), tris(dibenzylidene-acetone)dipalladium(0) (0.083 g, 0.09 mM) and S-2,2′-bis(diphenylphosphino)-1,1′-binapthyl (0.113 g, 0.18 mM) in toluene (23 ml) was heated to 80° C. for 18 hours under an inert atmosphere. On cooling to room temperature the mixture was diluted with DCM, washed with aqueous potassium carbonate, dried over sodium sulphate and concentrated. Chromatography (eluent gradient of DCM to EtOAc then MeOH:EtOAc (1:9)) gave the product as an off white solid (0.456 g). NMR: 9.38 (brs, 1H), 8.81 (brs, 1H), 8.18 (m, 1H), 8.01 (m, 1H), 7.94 (d, 1H), 7.75 (dd, 1H), 7.50 (m, 1H), 7.36 (d, 1H), 7.14 (d, 1H), 2.50 (s, 3H); m/z 292.29.

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