Methyl iodide → HCID 66972967, compound

Temperature

-78 °C

To a 1 M solution of sodium bis(trimethylsilyl)amide in THF (0.79 mL, 0.79 mmol) at −78° C. was added dropwise a solution of tert-butyl (5R)-3-oxo-5-phenylmorpholine-4-carboxylate from Step C (200 mg, 0.72 mmol) in DME (5 mL) at −78° C. The resulting mixture was stirred at −78° C. for 10 min then iodomethane (0.049 mL, 0.79 mmol) was added. After stirring at −78° C. for a further 1 h, the reaction mixture was quenched with saturated aqueous NH4Cl (5 mL) and extracted with EtOAc (2×10 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was partially purified by silica gel chromatography, eluting with a gradient of hexane:EtOAc—90:10 to 60:40. Further purification was achieved by HPLC, using a ChiralPak AS column and eluting with hexane:i-PrOH—90:10, to give the title compound. MS: m/z=236 (M−C4H7).

1. stirringAfter stirring at −78° C. for a further 1 h
2. customthe reaction mixture was quenched with saturated aqueous NH4Cl (5 mL)
3. extractionextracted with EtOAc (2×10 mL)
4. dry with materialThe combined organic layers were dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe crude product was partially purified by silica gel chromatography
8. washeluting with a gradient of hexane
9. customFurther purification
10. washeluting with hexane

ORD record

ord-41f7e49d147f4f70a7b215c3d23153df

Source dataset

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07893079B2