[F:1][C:2]1[CH:18]=[C:17]([N+:19]([O-])=O)[CH:16]=[CH:15][C:3]=1[O:4][C:5]1[C:6]2[N:13]([CH3:14])[CH:12]=[CH:11][C:7]=2[N:8]=[CH:9][N:10]=1>CC(O)=O.C(Cl)Cl.[Fe]>[CH3:14][N:13]1[C:6]2[C:5]([O:4][C:3]3[CH:15]=[CH:16][C:17]([NH2:19])=[CH:18][C:2]=3[F:1])=[N:10][CH:9]=[N:8][C:7]=2[CH:11]=[CH:12]1To a solution of 4-(2-fluoro-4-nitrophenoxy)-5-methyl-5H-pyrrolo[3,2-d] pyrimidine (29) (253.6 mg, 0.879 mmol) in AcOH (3 mL) at 90° C. was added iron powder (245 mg, 4.4 mmol). The mixture was stirred vigorously for 10 min and filtered. The filtrate was concentrated under reduced pressure to produce a solid, which was dissolved in DCM. The resultant solution was washed with cold NaHCO3 solution and water, dried over Na2SO4 and concentrated to provide a residue which was purified by column chromatography (eluent MeOH—CH2Cl2 1:20) to afford the title compound 30 as a brown solid (120.6 mg, 53% yield). LRMS (M+1) 240.1 (100%).
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