Acetone → 1-(Pyridin-3-yl)butane-1,3-dione

Participants

Reaction Steps

A cooled (0° C.) solution of ethyl nicotinate (3.00 g, 2.71 ml, 19.65 mmol) in THF (10 ml) was treated with sodium hydride (60%, 1.572 g, 39.3 mmol) followed by the dropwise addition of a solution of acetone (2.282 g, 39.3 mmol, 2.89 ml) in THF (10 ml). The mixture was heated at reflux for 3 hours and then allowed to cool to RT. The mixture was acidified to ˜pH5 with 2M HCl and partitioned between EtOAc and water. The organic phase was separated and washed with water, brine, dried (MgSO4) filtered and the solvent was removed in vacuo. Purification by chromatography on silica eluting with iso-hexane/EtOAc afforded the titled compound; 1H NMR (CDCl3, 400 MHz) δ 15.97 (1H, s), 9.10 (1H, s), 8.78 (1H, d), 8.22 (1H, d), 7.49 (1H, t), 6.21 (1H, s), 2.25 (3H, s). LCMS Rt=1.13 mins; [M+H]+ 164.21 Method LowpH_v002.

Provenance & Evidence