[N+:1]([C:4]1[CH:9]=[CH:8][C:7]([CH2:10][CH2:11][CH2:12][C:13]#[N:14])=[CH:6][CH:5]=1)([O-])=O.[NH4+].[Cl-]>O.CO.[Fe]>[NH2:1][C:4]1[CH:5]=[CH:6][C:7]([CH2:10][CH2:11][CH2:12][C:13]#[N:14])=[CH:8][CH:9]=1A mixture of compound 82 (2.67 g, 14 mmol), NH4Cl (11.2 g, 210 mmol) and Iron Powder (7.8 g, 140 mmol) in water (90 mL) and CH3OH (90 mL) was stirred at 90° C. for 1 h. After cooling, the reaction mixture was filtered and the solid was washed by DCM. The filtrates were separated, and the organic layer was washed with brine, dried over Na2SO4 and concentrated to dryness to give compound 83 (1.85 g, 83%) as a light yellow oil. 1H NMR (400 MHz, CDCl3) δ 6.90 (d, 2H, J=8.1 Hz), 6.58 (d, 2H, J=8.1 Hz), 3.30 (br s, 2H), 2.59 (t, 2H, J=7.4 Hz), 2.22 (t, 2H, J=7.4 Hz), 1.80-1.90 (m, 2H).
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