Iodine → 4-Iodo-6-oxabicyclo[3.2.1]octan-7-one

To a mixture of cyclohex-3-enecarboxylic acid (racemate, 42.0 g, 333 mmol), potassium iodide (72.0 g, 433 mmol) and sodium hydrogencarbonate (36.4 g, 433 mmol) in methylene chloride (750 mL) and water (750 mL) was added iodine (110.0 g, 433 mmol) at an internal temperature of 5° C., and the reaction mixture was stirred at room temperature for 3 hours. After quenched with 1 N aqueous sodium thiosulfate (1500 mL), the resulting mixture was extracted with methylene chloride (1000 mL×2). The combined organic layers were washed with aqueous sodium hydrogencarbonate (1000 mL), water (2000 mL) and brine (1000 mL), dried over anhydrous magnesium sulfate, filtered, then concentrated under reduced pressure. The precipitated crystals were collected by filtration and washed with hexane, followed by drying, to thereby give the title compound (80.2 g, 95%) as a white solid.

1. customAfter quenched with 1 N aqueous sodium thiosulfate (1500 mL)
2. extractionthe resulting mixture was extracted with methylene chloride (1000 mL×2)
3. washThe combined organic layers were washed with aqueous sodium hydrogencarbonate (1000 mL), water (2000 mL) and brine (1000 mL)
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. filtrationThe precipitated crystals were collected by filtration
8. washwashed with hexane
9. customby drying

ORD-Eintrag

ord-ea34083e503849dc830a7a8c9d57eb1a

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09434700B2