Br[C:2]1[CH:3]=[C:4]2[CH:10]=[CH:9][NH:8][C:5]2=[N:6][CH:7]=1.[CH3:11][O-:12].[Na+].FSI.[Cl-].[NH4+].[OH-].[NH4+]>CN(C)C=O.CO.C(OCC)(=O)C.[Cu]I.[Cu]Br.O>[CH3:11][O:12][C:2]1[CH:3]=[C:4]2[CH:10]=[CH:9][NH:8][C:5]2=[N:6][CH:7]=1To 5-bromo-7-azaindole (1, 500.0 mg, 2.53 mmol) in N,N-dimethylformamide (8 mL) were added copper(I) iodide (966 mg, 5.08 mmol) and sodium methoxide in methanol (3 M, 5 mL). The reaction was stirred overnight at 120° C. under an atmosphere of Argon. The reaction was poured into water, and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, filtered. The filtrate was concentrated and purified with silica gel column chromatograph eluting with 20% ethyl acetate in hexane to give white solid (2, 140 mg, 28%). MS (FSI) [M+H+]+=149.1. In an alternative method, 2.3 g (11.7 mmol) 5-bromo-7-azaindole (1, 2.3 g, 11.7 mmol) was dissolved in 75 mL N,N-dimethylformamide and 50 mL methanol (50 mL), adding sodium methoxide (32 g, 0.6 mol) and copper-(I) bromide (3.2 g, 22.4 mmol) at room temperature. The reaction was stirred for three hours at 100° C. under an atmosphere of argon. The mixture was diluted with ethyl acetate and poured into a solution of ammonium chloride:ammonium hydroxide (4:1). The organic layer was extracted with ammonium chloride:ammonium hydroxide (4:1), washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated. The desired compound was isolated by silica gel column chromatography eluting with 30% to 70% ethyl acetate in hexanes to give a yellow solid (2, 0.27 g, 15.6%). MS (ESI) [M+H+]+=149.2.
Loading…
