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A mixture of trans-5-[4-(aminomethyl)phenyl]-7-[4-(4-methylpiperazino)cyclohexyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine (50 mg, 0.119 mol) in pyridine (2 mL) and dichloromethane (2 mL) was cooled to 0° C. then treated with benzyl chloroformate (22 mg, 0.131 mmol). The mixture was warmed to ambient temperature and stirred an additional 2 hours, evaporated and the residue purified by preparative reverse-phase chromatography to give trans-benzyl N-(4-{4-amino-7-[4-(4-methylpiperazino)cyclohexyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl}benzyl)carbamate: 1H NMR (DMSO-d6, 400 MHz) 8.13(s, 1H), 7.85(t, 1H), 7.3-7.42(m, 10H), 6.02(bs, 2H), 5.06(s, 2H), 4.54(m, 1H), 4.26(d, 2H), 1.44-2.37(m, 20H); RP-HPLC (Hypersil HS C18, 5 m, 100 A, 250×4.6 mm; 5%-50% acetonitrile over 25 min, 1 mL/min) tr 22.15 min.; MS:MH+ 554.3.

1. temperatureThe mixture was warmed to ambient temperature
2. customevaporated
3. customthe residue purified by preparative reverse-phase chromatography