(S)-3-Methylpiperidine → 5-bromo-7-[(4-methylphenyl)sulfonyl]-4-[(3S)-3-methylpiperidin-1-yl]-7H-pyrrolo[2,3-d]pyrimidine

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5-Bromo-4-chloro-7-[(4-methylphenyl)sulfonyl]-7H-pyrrolo[2,3-d]pyrimidine (P3) was reacted with the hydrochloride salt of (3S)-3-methylpiperidine according to the method described for preparation of 3-{4-[(2S)-2-methylmorpholin-4-yl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl}benzonitrile (6) in Example 6. In this case, purification was effected via silica gel chromatography (Eluent: 5:1 petroleum ether/ethyl acetate), providing the product as a white solid. Yield: 4.3 g, 9.6 mmol, 92%.

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