Chlorotrimethylsilane → 3-(Hydroxymethyl)pyridin-2(1H)-one

Participants

Reaction Steps

To a solution of 2-hydroxynicotinic acid (3-067-01) (5.0 g) in toluene (70 mL), and to the reaction mixture were added hexamethyldisilazane (HMDS, 19 mL) and chlorotrimethylsilane (TMSCl, 0.23 mL), and the reaction mixture was heated under reflux. After stirring for 2 h, the solvent was removed, and toluene was added to the residue. To the reaction mixture was added diisobutylaluminum hydride (DIBAL, 2 M toluene solution, 90 mL) at −78° C., after stirring for 4 h, the reaction was quenched with methanol. The insoluble substance was filtered off on Celite, and the filtrate was evaporated under reduced pressure. To the residue were added water and ethyl acetate, and the organic layer was separated, and then the aqueous layer was extracted with three times with ethyl acetate. The combined organic layers were washed with water, brine, dried over anhydrous magnesium sulfate, and evaporated to give 3-hydroxymethyl-2(1H)-pyridone (7-008-01) (2.6 g, 59%) as a white solid.

Provenance & Evidence