C([O-])([O-])=O.[K+].[K+].[Br:7][C:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([Cl:17])[CH:15]=2)[NH:10][CH:9]=1.CI.[CH2:20](OC(=O)C)C>CN(C=O)C.CCCCCC>[Br:7][C:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([Cl:17])[CH:15]=2)[N:10]([CH3:20])[CH:9]=1
K2CO3 (1.39 g, 10.08 mmol) was added to a stirred solution of 3-bromo-5-chloro-1H-indole (775 mg, 3.36 mmol) in DMF (7.5 mL) and the resulting mixture was stirred for 30 minutes. This was followed by the addition of methyl iodide (572.5 mg, 4.03 mmol) at 0-5° C. and the stirring was continued for a further 2 hours at room temperature. The reaction was monitored by TLC (10% ethylacetate in hexane). The reaction mixture was partitioned between ice water and DCM. The organic layer was concentrated to afford the crude product. Purification by column chromatography on silica gel (5% ethylacetate in hexane) afforded 530 mg of 3-Bromo-5-chloro-1-methyl-1H-indole (65% yield).
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