Trimethylsulfonium iodide → 7-(1-oxaspiro[2.5]oct-6-yl)-5-(4-phenoxyphenyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine

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To a mixture of 4-[4-amino-5-(4-phenoxyphenyl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl]-1-cyclohexanone (2 g, 5 mmol) in tetrahydrofuran (17.5 mL) were added trimethyl-sulfonium iodide (1.53 g, 7.5 mmol) in dimethyl sulfoxide (25 mL) and potassium-t-butoxide (7.5 mL, 7.5 mmol, 1 M in tetrahydrofuran) under an atmosphere of nitrogen at −5° C. The mixture was stirred at −5° C. for 1 hour. The mixture was poured into ice water (50 mL). The water phase was extracted with ethyl acetate (3×30 mL). The combined organic extracts were washed with saturated ammonium chloride solution (2×30 mL), water (1×30 mL), and brine (2×30 mL) and dried over sodium sulfate. The solvent was removed under reduced pressure to yield 7-(1-oxaspiro[2.5]oct-6-yl)-5-(4-phenoxyphenyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine (1.9 g, 4.6 mmol, 2:1-mixture of trans and cis). The mixture was suspended in dichloromethane (3 mL). The solid was filtered and was washed with dichloromethane (1 mL) to yield 7-(1-oxaspiro[2.5]oct-6-yl)-5-(4-phenoxyphenyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine (0.994 g, 2.4 mmol, 4:1-mixture of trans and cis).

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