Sodium hydride → 7-(hydroxymethyl)-4-isopropyl-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one

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Methyl 4-isopropyl-2-oxo-1,2,3,4-tetrahydropyrido[2,3-b]pyrazine-7-carboxylate (1.3 g, 5.45 mmol) was suspended in tetrahydrofuran (68 mL). The white suspension was cooled to 0° C. and NaH (60% dispersion in mineral oil, 0.327 g, 8.17 mmol) was added. The reaction was removed from the ice bath and allowed to stir at RT for 0.5 h. The solution was then cooled to −78° C. and LiAlH4 was added over two min. A temperature between −30 and −20° C. was maintained. The reaction was cooled to −78° C. and MeOH (2 mL) was added. The reaction was stirred at room temperature 30 min. The reaction was poured into ethyl acetate (400 mL) and water (100 mL), and stirred for 1 hr. The mixture was filtered through medium frit to remove tan solids. The aqueous layer was extracted with ethyl acetate (1×100 mL). The organic fractions were combined, washed once with brine (100 mL), dried with sodium sulfate and concentrated to the title compound (1.10 g, 91%) as a white solid. [M+H] calc'd for C11H15N3O2, 222. found, 222.

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