Cesium carbonate → (S)-5-(5-Chloro-pyridin-2-ylmethoxy)-2-{2-[4-(2-hydroxymethyl-pyrrolidin-1-ylmethyl)-2-methyl-phenyl]-2-oxo-ethyl}-2H-pyridazin-3-one

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To a solution of 2-[2-(4-bromomethyl-2-methyl-phenyl)-2-oxo-ethyl]-5-(5-chloro-pyridin-2-ylmethoxy)-2H-pyridazin-3-one (preparation 7b, 110 mg, 0.24 mmol) in N,N-dimethylacetamide (2 mL) is added Cs2CO3 (194 mg, 0.60 mmol) and L-prolinol (37 mg, 0.36 mmol). The reaction mixture is stirred for 2 days at room temperature. The mixture is purified via reverse phase HPLC chromatography (Xbridge C18 5 μm, gradient 5%→90% acetonitrile in water+0.3% NH4OH, 120 mL/min).

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