Methyl pyruvate → 8-(2,4-dichloro-phenyl)-4-(2-methoxy-1-methyl-ethyl)-2-methyl-4H-pyrido[2,3-b]pyrazin-3-one

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Reaction Steps

4-(2,4-Dichloro-phenyl)-N2-(2-methoxy-1-methyl-ethyl)-pyridine-2,3-diamine (0.13 g, 0.40 mmol) was dissolved in toluene (20 mL), followed by methyl pyruvate (0.081 g, 0.80 mmol) and heated at reflux overnight. The reaction was concentrated in vacuo and purified by reverse phase prep HPLC to yield 3.2 mg (2%) of 8-(2,4-dichloro-phenyl)-4-(2-methoxy-1-methyl-ethyl)-2-methyl-4H-pyrido[2,3-b]pyrazin-3-one (Example 9): 1H NMR (300 MHz, CD3OD): δ 8.6 (d, 1H), 7.6 (s, 1H), 7.4–7.25 (m, 3H), 4.4 (m, 1H). 3.8 (m, 1H), 3.3 (s, 3H), 2.4 (s, 3H), 1.6 (d, 2H), 1.25 (s, 2H). MS (AP) m/z 378.3 [(M+H)+, 100].

Provenance & Evidence