Iodine → 4-Chloro-6-iodo-7-(4-methylbenzene-1-sulfonyl)-7H-pyrrolo[2,3-d]pyrimidine

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Reaction Conditions

Reaction Steps

To a solution of 4-chloro-7-[(4-methylphenyl)sulfonyl]-7H-pyrrolo[2,3-d]pyrimidine [5.4 g, Reference Example 3], in tetrahydrofuran (96 mL) at −78° C. was added drop wise a solution of butyl lithium in hexane (12.1 mL, 1.6M) under inert atmosphere. The solution was stirred at −78° C. for 3 hours and iodine (8.9 g) was added. The reaction mixture was stirred at −78° C. for 2 hours, and allowed to reach room temperature. The reaction mixture was partitioned between ethyl acetate and aqueous sodium sulfite solution, dried over magnesium sulfate and the solvent was evaporated under reduced pressure. The residue was subjected to flash column chromatography on silica eluting with a gradient of ethyl acetate and cyclohexane (50:50, to 100, v/v) to give the title compound (1.52 g) as an amorphous solid. MS: 434 [MH]+. LCMS (Method B) RT=4.26 minutes.

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