Hydrochloric Acid → 4-Pyridinone,3-OH-2-Me

1.00 g (2.68 mmol) of 2-methyl-3-benzyloxypyridine-4(1H)-one of dimethylene xylitol compound is put into a mixture of 10 mL ethanol—2 mL H2O; then 0.08 g of Pd/C at 10% is added, and the pH of the solution is adjusted to pH=1 with a solution of concentrated HCl. The reaction medium is then subjected to catalytic hydrogenolysis under agitation at room temperature for 4 hours. At the end of this hydrogenolysis, the reaction medium is filtered. Then, 25 mL of water is added to the residue, and the solution is neutralized by addition of an aqueous solution of soda. The reaction medium is extracted with 2×20 mL of dichloromethane; the organic phases are collected, dried on sodium sulphate, filtered, and evaporated under reduced pressure; 509 mg (1.80 mmol) of 2-methyl-3-hydroxypyridine-4(1H)-one of dimethylene xylitol is isolated, which is pure at chromatographic and NMR analyses. Yield: 67%.

1. filtrationAt the end of this hydrogenolysis, the reaction medium is filtered
2. additionThen, 25 mL of water is added to the residue
3. additionthe solution is neutralized by addition of an aqueous solution of soda
4. extractionThe reaction medium is extracted with 2×20 mL of dichloromethane
5. customthe organic phases are collected
6. customdried on sodium sulphate
7. filtrationfiltered
8. customevaporated under reduced pressure

ORD-Eintrag

ord-a03787d4a018453aa650efd075cc6330

Quelldatensatz

uspto-grants-2001_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06177409B1