A mixture of 2,4-dichloro-5-iodo-7-tosyl-7H-pyrrolo[2,3-d]pyrimidine (1.00 g, 2.13 mmol), benzylamine (0.233 mL, 2.13 mmol) and DIEA (0.750 mL, 4.31 mmol) in dioxane (12 mL)/nBuOH (12 mL)/DMF (3 mL) was stirred at 70° C. for 2 h. It was concentrated in vacuo. The residue was partitioned between water and EtOAc. The organic phase was separated, washed with 1N HCl, then with 5% NaHCO3, dried over Na2SO4, concentrated in vacuo to give N-benzyl-2-chloro-5-iodo-7-tosyl-7H-pyrrolo[2,3-d]pyrimidin-4-amine (0.993 g).
