1-Methylpiperazine → N1-(4-{4-amino-1-[2-(4-methylpiperazino)-2-oxoethyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl}-2-fluorophenyl)-2,3-dichloro-1-benzenesulfonamide

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Reaction Steps

Ethyl 2-[4-amino-3-(4-{[(2,3-dichlorophenyl)sulfonyl]amino}-3-fluorophenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]acetate was treated with 1-methylpiperazine using the representative procedure for amide formation. Purification by preparative HPLC (25 to 100% CH3CN in 0.1 M aqueous ammonium acetate over 20 min at 21 mL/min using an 8Hypersi1HS C18, 250×21 mm column, Rt 6.4-7.0 min) afforded N1-(4-{4-amino-1-[2-(4-methylpiperazino)-2-oxoethyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl}-2-fluorophenyl)-2,3-dichloro-1-benzenesulfonamide as a white solid (0.005 g, 0.009 mmol): RP-HP (25 to 100% acetonitrile in 0.1 M aqueous ammonium acetate over 10 min at 1 mL/min using a Hypersil HS C18, 250×4.6 mm column) Rt 6.83 min. 1H NMR (DMSO-d6, 400 MHz) δ 8.20 (s, 1H), 7.96 (d, 1H), 7.88 (d, 1H), 7.50 (t, 1H), 7.36 (m, 3H), 5.31 (s, 2H), 3.45 (m, 4H), 2.50 (m, 4H), 2.30 (s, 3H), MS: MH+ 593.

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