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To I-12.2 (32.0 g, 142 mmol) in anhydrous dioxane (400 mL) is added R3 (54.4 g, 241 mmol) and potassium acetate (41.6 g, 424 mmol). The mixture is purged with Argon, [1,1?-Bis(diphenylphosphino)ferrocene]dichloropalladium(II) as a complex with dichloromethane (11.2 g, 14 mmol) is added and the mixture is heated to 90 C. for 2 h. The reaction mixture is diluted with ethyl acetate and water, the organic layer is washed with water, dried over MgSO4 and concentrated. The residue is purified via flash chromatography (cyclohexane/EA=70:30). Yield 72%, m/z 274 [M+H]+, rt 0.67 min, LC-MS Method V011_S01.
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Reference:
Patent; BOEHRINGER INGELHEIM INTERNATIONAL GMBH; ANDERSKEWITZ, Ralf; BINDER, Florian; GRAUERT, Matthias; GRUNDL, Marc; HAEBEL, Peter Wilhelm; OOST, Thorsten; PAUTSCH, Alexander; PETERS, Stefan; VINTONYAK, Viktor; US2014/275025; (2014); A1;,
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