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A mixture of tert-butyl 4-bromoisoindoline-2-carboxylate (1.70 g, 5.70 mmol),4,4,4?,4?,5 ,5 ,5 ?,S ?-octamethyl-2,2?-bi(1 ,3 ,2-dioxaborolane) (1.74 g, 6.84 mmol), potassiumacetate (1.68 g, 17.1 mmol), and PdC12(dppf) DCM adduct (0.466 g, 0.570 mmol) in 1,4-dioxane (25 mL) was bubbled with nitrogen and stirred at 80 C overnight. The mixture was cooled to room temperature, diluted with EtOAc, washed with water, dried and concentrated. The residue was subjected to colunm chromatography on silica gel, eluting with EtOAc-hexanes (gradient from 0-30%), to provide tert-butyl 4-(4,4,5 ,5 -tetramethyl5 1 ,3,2-dioxaborolan-2-yl)isoindoline-2-carboxylate as a white solid (1.50 g, 76% yield).
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Reference:
Patent; BRISTOL-MYERS SQUIBB COMPANY; AHMAD, Saleem; BATT, Douglas G.; LIU, Qingjie; MACOR, John E.; TINO, Joseph A.; WATTERSON, Scott Hunter; NAIR, Satheesh Kesavan; MAISHAL, Tarun Kumar; (247 pag.)WO2016/65236; (2016); A1;,
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