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We described a regioselective tri‐ and tetra‐functionalization of the pyridazine scaffold using two readily available building blocks: 3‐alkylthio‐6‐chloropyridazine and 3,4‐bis(methylthio)‐6‐chloropyridazine by performing selective metalations with TMPMgCl ⋅ LiCl and catalyst‐tuned cross‐coupling reactions with arylzinc halides. Several of the resulting pyridazines were converted into more elaborated...