Sodium hydride → {(Z)-4-[(R)-2-Oxo-6-((E)-3-oxo-4-phenyl-but-1-enyl)-piperidin-1-yl]-but-2-enyloxy}-acetic acid methyl ester

Sodium hydride (60% dispersion in oil, 22 mg, 0.55 mmol) was added to a solution of dimethyl 2-oxo-3-phenylpropylphosphonate (135 mg, 0.56 mmol) in THF (1.0 mL) at 0° C. After 1 h at 0° C., [(Z)-4-((R)-2-formyl-6-oxo-piperidin-1-yl)-but-2-enyloxy]-acetic acid methyl ester (150 mg, 0.56 mmol) in THF (1 mL) was added via cannula. The reaction was allowed to warm to rt. After 16.5 h at rt, the reaction was quenched with saturated aqueous NH4Cl (15 mL) and extracted with EtOAc (3×15 mL). The combined organic phase was washed with brine (20 mL), dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by flash column chromatography on silica gel (30% →60% EtOAc/CH2Cl2, gradient) afforded 91 mg (42%) of the title compound.

1. waitAfter 16.5 h at rt
2. customthe reaction was quenched with saturated aqueous NH4Cl (15 mL)
3. extractionextracted with EtOAc (3×15 mL)
4. washThe combined organic phase was washed with brine (20 mL)
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customPurification of the residue by flash column chromatography on silica gel (30% →60% EtOAc/CH2Cl2, gradient)

ORD record

ord-480cd9dc2d61418fab706b3c6be8d877

Source dataset

uspto-grants-2007_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07179820B2