Sodium hydride → 7-[(R)-2-oxo-6-((E)-3-oxo-oct-1-enyl)-piperidin-1-yl]-heptanoic acid methyl ester

Sodium hydride (60% dispersion in oil, 7.2 mg, 0.18 mmol) was added to a solution of dimethyl 2-oxoheptylphosphonate (47 mg, 0.19 mmol) in THF (1 mL) at 0° C. After 10 min at 0° C., the solution was allowed to warm to rt. After 1 h at rt, the solution was recooled to 0° C. and 7-((R)-2-formyl-6-oxo-piperidin-1-yl)-heptanoic acid methyl ester (crude, prepared in accordance with Example 29, step 5, ˜0.20 mmol) in THF (1 mL) was added via cannula. The reaction was allowed to warm to rt. After 17 h at rt, the reaction was quenched with aqueous acetic acid (50%, 5 mL) and extracted with EtOAc (3×10 mL). The combined organic phase was washed with saturated aqueous NaHCO3 (10 mL) and brine (10 mL) then dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by flash column chromatography on silica gel (CH2Cl2→2% MeOH/CH2Cl2, gradient) afforded 59 mg (90%) of 7-[(R)-2-oxo-6-((E)-3-oxo-oct-1-enyl)-piperidin-1-yl]-heptanoic acid methyl ester.

1. waitAfter 1 h at rt
2. customwas recooled to 0° C.
3. temperatureto warm to rt
4. waitAfter 17 h at rt
5. customthe reaction was quenched with aqueous acetic acid (50%, 5 mL)
6. extractionextracted with EtOAc (3×10 mL)
7. washThe combined organic phase was washed with saturated aqueous NaHCO3 (10 mL) and brine (10 mL)
8. dry with materialthen dried (Na2SO4)
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. customPurification of the residue by flash column chromatography on silica gel (CH2Cl2→2% MeOH/CH2Cl2, gradient)

ORD record

ord-9562676d2f024f529c463c0f0248863e

Source dataset

uspto-grants-2008_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07326716B2