Lithium Hydroxide → 7-(2-Phenyl-3-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoic acid

Participants

Reaction Conditions

Reaction Steps

A solution of ethyl 7-(2-phenyl-3-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoate (1.07 g, 2.338 mmol) in THF (12 ml) and water (6 ml) was treated with LiOH (0.560 g, 23.38 mmol) and stirred at 70° C. for 18 hours. After cooling to RT, the reaction mixture was concentrated in vacuo. The residue was diluted with water (20 ml) and the pH was adjusted to pH˜4 using 2M HCl. The aqueous portion was extracted with EtOAc (2×20 ml). The organic extracts were washed with brine, dried (MgSO4) and evaporated under vacuum. The residue was dissolved in hot (˜80° C.) ethanol (20 ml) and water (˜15 ml) was added until the solution became turbid. Upon cooling a solid precipitated. The mixture was kept cold for 72 hours. The solid was collected by filtration, washed with water and dried at 40° C. for 5 hours to afford the title compound;

Provenance & Evidence