Hydrochloric Acid → HCID 86604093, compound

To a solution of (3R,9aS)-hexahydro-1H-[1,4]oxazino[3,4-c][1,4]oxazin-3-ylmethyl acetate (0.922 g, 4.28 mmol) in methanol (14.0 mL) was added 1.03 mL (4.50 mmol) of sodium methoxide (25% wt. in methanol) dropwise at room temperature. After 5 min., 1.6 mL (6.43 mmol) of 4.0M hydrogen chloride in dioxane was added and a pink precipitate formed. The solution was concentrated in vacuo and the pink solid was taken up in 30.0 mL dichloromethane. This slurry was cooled in an ice bath and triethylamine (3.0 mL, 21.5 mmol) was added, followed by methanesulfonyl chloride (0.37 mL, 4.71 mmol). The resultant yellow solution was stirred for 30 minutes at room temperature. The mixture was then partitioned between dichloromethane and saturated aqueous sodium bicarbonate then the aqueous layer was extracted (3×50 mL dichloromethane). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to provide crude (3R,9aS)-hexahydro-1H-[1,4]oxazino[3,4-c][1,4]oxazin-3-ylmethyl methanesulfonate which was taken on to the following reaction without purification.

1. customa pink precipitate formed
2. concentrationThe solution was concentrated in vacuo
3. temperatureThis slurry was cooled in an ice bath
4. customThe mixture was then partitioned between dichloromethane and saturated aqueous sodium bicarbonate
5. extractionthe aqueous layer was extracted (3×50 mL dichloromethane)
6. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo

ORD record

ord-2413029a02b94021a6200e8c23ce00e7

Source dataset

uspto-grants-2011_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08067436B2