2,5-Difluorobenzenesulfonyl chloride → 1-(2,5-Difluorobenzenesulfonyl)-7-iodo-1,2,3,4-tetrahydropyrido[2,3-b]pyrazine

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Reaction Steps

7-Iodo-1,2,3,4-tetrahydropyrido[2,3-b]pyrazine (100 mg) was dissolved in anhydrous pyridine. 2,5-difluorobenzene sulfonyl chloride (1.0 eq) was added and the mixture stirred at room temperature for 16 hours. The reaction mixture was concentrated and purified by column chromatography to give the title compound as a pale yellow solid (13% yield). M.p. 187-188° C., LCMS: m/z=437.73 (M+H+), 1H-NMR (CDCl3, 400 MHz) δ 3.29-3.33 (m, 2H), 3.83 (t, J=4.8 Hz, 2H), 5.08 (bs, 1H), 7.11-7.19 (m, 1H), 7.26-7.33 (m, 1H), 7.58-7.63 (m, 1H), 7.96 (d, J=1.5 Hz, 1H), 8.03 (d, J=1.8 Hz, 1H).

Provenance & Evidence