Bromine → (S)-tert-butyl 1-(3-bromo-6-cyano-9-((2-(trimethylsilyl)ethoxy)methyl)-9H-dipyrido[2,3-b;4',3'-d]pyrrol-4-yl)pyrrolidin-3-yl(ethyl)carbamate

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Reaction Steps

A mixture of (S)-tert-butyl 1-(6-cyano-9-((2-(trimethylsilyl)ethoxy)methyl)-9H-dipyrido[2,3-b;4′,3′-d]pyrrol-4-yl)pyrrolidin-3-yl(ethyl)carbamate (125 mg, 0.23 mmol), sodium acetate (38 mg, 0.46 mmol), and bromine (36 μL, 0.7 mmol) in acetic acid (1 mL) was stirred at ambient temperature for 1 minute. The reaction mixture was diluted with ethyl acetate (50 mL), and washed with water (20 mL). The organic layer was separated, dried over sodium sulfate, filtered, concentrated in vacuo, and purified by flash chromatography (silica, 4 g, ISCO, 0-50% ethyl acetate in heptane) to afford the title compound as a pale yellow oil, which was used in the next step without any further purification (65 mg).

Provenance & Evidence