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

Sodium hydride (60% dispersion in oil, 15 mg, 0.37 mmol) was added to a solution of dimethyl 2-oxoheptylphosphonate (87 mg, 0.33 mmol) in THF (2 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-(2-formyl-6-oxo-piperidin-1-yl)-heptanoic acid methyl ester (crude from previous reaction, ˜0.37 mmol) in THF (2 mL) was added via cannula. The reaction was allowed to warm to rt. After 17 h at rt, the reaction was quenched with acetic acid (50% aqueous, 20 mL) and extracted with EtOAc (3×20 mL). The combined organic phase was washed with saturated aqueous NaHCO3 (20 mL) and brine (20 mL), dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by flash column chromatography on silica gel (CH2Cl2→2% MeOH/CH2Cl2, gradient) afforded 128 mg (95%) of the title compound.

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 acetic acid (50% aqueous, 20 mL)
6. extractionextracted with EtOAc (3×20 mL)
7. washThe combined organic phase was washed with saturated aqueous NaHCO3 (20 mL) and brine (20 mL)
8. dry with materialdried (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-36f24ceb14f14f229cc5d461600e39d6

Source dataset

uspto-grants-2007_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07179820B2