6-Methoxy-3-pyridinylamine → HCID 178471946, 화합물

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A mixture of ethyl 2-(ethoxymethylene)-3-oxobutanoate (100 g, 0.54 mol) and 2-methoxy-5-aminopyridine (67 g, 0.54 mol) in chlorobenzene (500 mL) was heated at 135° C. for 4 h in a round bottomed flask that was equipped with a distillation apparatus to collect the ethanol generated during the reaction. The reaction mixture was cooled and concentrated and the residue was triturated in diethylether and filtered to obtain the desired product (120 g, 84%) as an off-white solid: 1H NMR (500 MHz, CDCl3) δ 12.74 (d, 12.3 Hz, 1H), 8.35 (d, J=13.0 Hz, 1H), 8.07 (d, J=2.8 Hz, 1H), 7.55 (d, J=8.8, 2.9 Hz, 1H), 6.79 (d, J=8.8 Hz, 1H), 4.30 (q, J=7.1 Hz, 2H), 2.55 (s, 3H), 1.33 (t, J=7.1 Hz, 1H); ESI MS m/z 265 [M+H]+.

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