Potassium Phosphate, Tribasic → methyl 4-(tert-butoxycarbonylamino)-1-(5-cyclopropyl-7-tosyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylate

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Methyl 1-(5-bromo-7-tosyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-4-(tert-butoxycarbonylamino)piperidine-4-carboxylate (Intermediate 62) (1.1 g, 1.81 mmol), potassium phosphate tribasic (1.343 g, 6.33 mmol), tricyclohexyl phosphine (0.101 g, 0.36 mmol) and cyclopropylboronic acid (0.438 g, 4.34 mmol) were taken up in toluene (10 mL) and water (0.400 mL). The mixture was purged with nitrogen for 30 minutes then palladium(II) acetate (0.041 g, 0.18 mmol) was added. The mixture was heated to 75° C. for 6 hours and then allowed to cool and stir at room temperature overnight. The reaction mixture was diluted with EtOAc (75 mL), and washed sequentially with water (50 mL) and saturated brine (50 mL). The organic layer was dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 10 to 30% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford methyl 4-(tert-butoxycarbonylamino)-1-(5-cyclopropyl-7-tosyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylate (0.447 g, 43.4%) as a cream solid.

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