1,4-Dioxane → 4-((2-Chloro-5-(2-methylbenzo[d]oxazol-6-yl)-7-((2-(trimethylsilyl)ethoxy)-methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)oxy)-1-methylcyclohexanol

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To a degassed mixture of 4-((2-chloro-5-iodo-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)oxy)-1-methylcyclohexanol (1 equiv), 2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzo[d]oxazole (1.2 equiv) and tripotassium phosphate trihydrate (3 equiv) in a 9:1 mixture of 1,4-dioxane and water (0.18 M) was added palladium 1,1-bis(diphenylphosphion)ferrocene dichloride (0.1 equiv). The reaction mixture was stirred at 70° C. for 3 h. After the reaction was completed, the reaction mixture was cooled to room temperature and concentrated. The residue was purified by silica gel chromatography (0-2% DCM in methanol) to afford the title compound (95% yield) as a red oil. MS (ESI) m/z 543.2 [M+1]+.

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