Sodium hydride → 4-(Dimethylamino)pyridine

##STR28## tert-Butyl 3-carbethoxy-1-(2-(4-propylphenyl)ethyl)-2-cyclopentene-1-carboxylate. Sodium hydride (16 mg of 60% oil dispersion, 0.40 mmol) was added to a solution of 102 mg (0.35 mmol) of tert-butyl 2-formyl-4-(4-propylphenyl)butanoate in 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (1.5 mL). After 20 min., 1-carboethoxycyclopropyl triphenylphosphonium tetrafluoroborate (193 mg, 0.42 mmol) was added to the pale yellow solution and stirring was continued overnight at room temperature. The solution was then partitioned between hexane (25 mL) and 2N aq. HCl (25 mL). The organic layer was washed with water (15 mL) and saturated aq. NaCl (15 mL), dried (Na2SO4), decanted, and evaporated. The residue was purified by flash column chromatography on silica gel (8 g), eluting with 100 mL of 5% EtOAc/hexane, to give the title compound as 52 mg (38% yield) of colorless oil.

1. waitwas continued overnight at room temperature
2. customThe solution was then partitioned between hexane (25 mL) and 2N aq. HCl (25 mL)
3. washThe organic layer was washed with water (15 mL) and saturated aq. NaCl (15 mL)
4. dry with materialdried (Na2SO4)
5. customdecanted
6. customevaporated
7. customThe residue was purified by flash column chromatography on silica gel (8 g)
8. washeluting with 100 mL of 5% EtOAc/hexane

ORD-Eintrag

ord-01b38a5c97fb4ba88abf4fc3b0be34ca

Quelldatensatz

uspto-grants-1995_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05403952