C[Mg]Br.Br[C:5]1[CH:6]=[C:7]2[C:11](=[N:12][CH:13]=1)[NH:10][CH:9]=[CH:8]2.C(Cl)Cl.[CH3:17][O:18][C:19]1[CH:20]=[C:21]([CH:24]=[C:25]([O:27][CH3:28])[CH:26]=1)[CH2:22]Br>[Cl-].[Cl-].[Zn+2]>[CH3:28][O:27][C:25]1[CH:24]=[C:21]([CH:20]=[C:19]([O:18][CH3:17])[CH:26]=1)[CH2:22][C:9]1[NH:10][C:11]2=[N:12][CH:13]=[CH:5][CH:6]=[C:7]2[CH:8]=1
Into a round bottom flask, under an atmosphere of nitrogen, methylmagnesium bromide (0.16 mL, 1.4 mmol) was added to a solution of 7-azaindole (1) (0.150 g, 1.27 mmol) in anhydrous methylene chloride (12 mL, 0.19 mol), at room temperature. The resulting mixture was stirred at room temperature for one hour before zinc dichloride (0.21 g, 1.5 mmol) was added. After stirring for an additional hour, 3,5-dimethoxybenzyl bromide (4) (0.35 g, 1.5 mmol) was added into the reaction mixture. The reaction was stirred overnight at room temperature before it was quenched with methanol. The mixture was evaporated to dryness, dissolved into ethyl acetate and washed with water. The aqueous portion was neutralized with sodium bicarbonate (s.s.) and extracted with ethyl acetate (3×). Organic portions were combined and washed with 0.1N HCl, dried over anhydrous sodium sulfate and evaporated under reduced pressure. Purification by preparative TLC with 50% ethyl acetate/hexane gave Compound 29 as a yellow powder (15 mg; M+H=269.2, M−H=267.2).
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