3,3-Dibromo-1,3-dihydro-1-((2-(trimethylsilyl)ethoxy)methyl)-2H-pyrrolo(2,3-b)pyridin-2-one → 1-{[2-(Trimethylsilyl)ethoxy]methyl}-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one

Participants

Reaction Steps

Zinc (100 g, 1.54 mol) was added to a solution of 3,3-dibromo-1-{[2-(trimethylsilyl)ethoxy]methyl}-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one from Step B (65 g, 0.154 mol) in THF (880 mL) and saturated aqueous NH4Cl (220 mL). After 3 h, the reaction was filtered and concentrated in vacuo. The residue was partitioned between EtOAc (500 mL) and H2O (500 mL), which resulted in the formation of a white precipitate. Both layers were filtered through a Celite pad and the layers were separated. The aqueous layer was further extracted with EtOAc (2×200 mL) and the combined organic layers were washed with H2O (100 mL), dried over MgSO4, filtered, and concentrated. The crude product was filtered through a plug of silica gel, eluting with EtOAc:CH2Cl2-10:90, and the eluant was concentrated under reduced pressure to provide the title compound. MS: m/z=265 (M+1).

Provenance & Evidence