Iodine → 5,6,7,9-Tetrahydro-7-iodo-8H-pyrido[2,3-b]azepin-8-one

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Reaction Steps

To a solution of 300 mg of 5,6,7,9-tetrahydro-8H-pyrido[2,3-b]azepin-8-one in 3 mL of dichloromethane at 0° C. was added 0.84 mL of N,N,N',N'-tetramethylethylenediamine (TMEDA) and 0.78 mL of trimethylsilyl iodide. After 30 min, 720 mg of solid iodine was added in one portion. The reaction mixture was stirred at 0° C. an additional 40 min before dichloromethane and excess aqueous sodium sulfite was added to reduce the excess iodine. The mixture was extracted with dichloromethane and the extracts were evaporated to yield 550 mg of the crude product. Flash chromatographic separation on silica gel with ethyl acetate gave 333 mg of purified product characterized by its NMR and mass spectra.

Provenance & Evidence