Stannous chloride dihydrate → 7-iodo-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one

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Reaction Steps

(5-Iodo-3-nitro-pyridin-2-ylamino)-acetic acid ethyl ester (17 g) was dissolved in ethanol. SnCl2.2H2O was added and the reaction mixture was heated to 80° C. for two (2) hours. The resulting precipitate was filtered and washed with ethanol to give the title compound as a rust colored solid (59-77% yield). M.p. 81° C., LCMS: m/z=275.91 (M+H+), 1H-NMR (DMSO-d6, 400 MHz) δ 3.94 (s, 2H), 6.94 (bs, 1H), 7.12 (d, J=1.8 Hz, 1H), 7.74 (s, J=1.8 Hz, 1H), 10.40 (bs, 1H).

Provenance & Evidence