Sodium Sulfate → Phenylmethyl [((3S)-1-{2-[6-(methyloxy)-3-oxopyrido[2,3-b]pyrazin-4(3H)-yl]ethyl}-3-piperidinyl)methyl]carbamate

Participants

Reaction Steps

[6-(Methyloxy)-3-oxopyrido[2,3-b]pyrazin-4(3H)-yl]acetaldehyde (for a preparation see Example 126(e)) (0.30 g, 1.36 mmol) was combined with phenylmethyl [(3R)-3-piperidinylmethyl]carbamate (for a preparation see Example 92(b)) (0.337 g, 1.36 mmol) in a 1:1 MeOH/DCM solution (30 mL). Excess Na2SO4 was added as a drying agent and the solution was stirred at ambient temperature for 16 h. NaBH(OAc)3 (0.86 g, 4.08 mmol) was added and the reaction was stirred an additional 2 h. The resulting solution was concentrated onto silica gel under vacuum and the crude residue was purified by column chromatography (silica gel) using a DCM/DCM-MeOH—NH4OH (90:10:1) gradient to yield the desired product as an off white solid (0.37 g, 61%).

Provenance & Evidence