Carbon Dioxide → 3-hydroxy-6-methyl-2-(2,2,2-trifluoro-1-hydroxy-ethyl)-1H-pyridin-4-one

Temperatur

100 °C

5-Hydroxy-2-methyl-1H-pyridin-4-one hydrochloride (1.00 g, 6.19 mmol) and potassium carbonate (1.02 g, 7.42 mmol) was mixed together in water (10 mL) at room temperature, and stirred until evolution of carbon dioxide ceased. Then, 2,2,2-trifluoro-1-methoxy-ethanol (1.60 g, 12.4 mmol) was added. The reaction mixture was heated in a sealed flask at 100° C. for 20 h. The mixture was cooled down to RT and neutralized with acetic acid to pH at between 5 to 6. The precipitate was collected by suction filtration and washed with water and ether. Thus, 3-hydroxy-6-methyl-2-(2,2,2-trifluoro-1-hydroxy-ethyl)-1H-pyridin-4-one was obtained as an off-white solid (1.06 g, 76% yield). 1H NMR (90 MHz, DMSO-d6) δ (ppm): 6.09 (s, 1H, CH); 5.42 (apparent q, 1H, CH), 2.28 (s, 3H, CH3); MS-ESI (m/z) 224.1 [M+1]+, 206.1, 186.1, 178.1.

1. filtrationThe precipitate was collected by suction filtration
2. washwashed with water and ether

ORD-Eintrag

ord-7b1e6d08f0f8468cbe07850641faef23

Quelldatensatz

uspto-grants-2011_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08026261B2