Dimethylformamide → 4-bromo-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-pyrrolo[2,3-b]pyridine

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To a solution of 4-bromo-1H-pyrrolo[2,3-b]pyridine (6.2 g, 0.031 mol) and [β-(trimethylsilyl)ethoxy]methyl chloride (6.7 mL, 0.038 mol) in DMF (62 mL, 0.80 mol) was added sodium hydride (1.5 g, 0.038 mol) at 0° C., and the resulting solution turned opaque. The mixture was stirred for additional 4 h, then diluted with methyl tert-butyl ether (MTBE). The organic layer was separated and washed with water (×2) and brine aqueous solution successively. The organic phase was dried and concentrated in vacuo to give 14.1 g of a product as a pale orange oil. The oil was purified by column chromatography eluting with 5-20% ethyl acetate/hexanes to give the purified product as a colorless oil (9.66 g, 94% yield).

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