O1CCCC1.[NH3:6].Cl[C:8]1[C:9]2[C:16]([I:17])=[CH:15][N:14]([CH:18]3[CH2:21][N:20]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:19]3)[C:10]=2[N:11]=[CH:12][N:13]=1.C(Cl)(Cl)Cl>O>[NH2:6][C:8]1[C:9]2[C:16]([I:17])=[CH:15][N:14]([CH:18]3[CH2:21][N:20]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:19]3)[C:10]=2[N:11]=[CH:12][N:13]=1Tetrahydrofuran (2.5 ml) and 28% aqueous ammonia (2.5 ml) were added to the tert-butyl 3-(4-chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidin-7-yl)azetidine-1-carboxylate (350 mg) obtained in Step 1 above. The reaction mixture was stirred at 100° C. for 1.5 hours using a microwave reactor. Chloroform and water were added thereto to separate the organic layer. The organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure to obtain the title compound as a white solid (340 mg). Physical properties: m/z [M+H]+ 416.0
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