Methyl iodide → 2,2,5,5-Tetramethyl-1,3-dioxane-4,6-dione

Temperatur

75 °C

A mixture of Meldrum's acid (5.52 g, 38.3 mmol), potassium carbonate (26.5 g, 191 mmol) and methyl iodide (7.15 mL, 115 mmol) in acetonitrile (75 mL) was heated at 75° C. in a sealed tube for 7 hrs. The mixture was cooled to room temperature, diluted with dichloromethane (300 mL), filtered and the filtrate evaporated to dryness in vacuo. Ethyl acetate (75 mL), hexanes (75 mL) and water (50 mL) were added and phases were separated. The organic layer was washed with 10% aqueous solution of sodium thiosulfate (50 mL) and water (50 mL); dried over anhydrous magnesium sulfate and solvent removed in vacuo to give 2,2,5,5-tetramethyl-[1,3]dioxane-4,6-dione as white solid.

1. temperatureThe mixture was cooled to room temperature
2. filtrationfiltered
3. customthe filtrate evaporated to dryness in vacuo
4. additionEthyl acetate (75 mL), hexanes (75 mL) and water (50 mL) were added
5. customphases were separated
6. washThe organic layer was washed with 10% aqueous solution of sodium thiosulfate (50 mL) and water (50 mL)
7. dry with materialdried over anhydrous magnesium sulfate and solvent
8. customremoved in vacuo

ORD-Eintrag

ord-7f77b13daea14f93a6ad92889e9eb7d9

Quelldatensatz

uspto-grants-2014_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08815802B2