Ethyl phenylacetate → HCID 53726727, compound

Temperature

-78 °C

A solution of freshly prepared lithium diisopropylamide (23 mL of a 0.31 M stock solution, 7.13 mmol) cooled to −78° C. was treated with phenyl-acetic acid ethyl ester (1.06 g, 6.48 mmol) in tetrahydrofuran/hexamethylphosphoramide (16.1 mL, 3:1). The resulting solution was stirred at −78° C. for 45 min. At this time, the reaction was treated with a solution of iodomethylcyclopentane (1.50 g, 7.14 mmol) in hexamethylphosphoramide (1.5 mL). The mixture was stirred at −78° C. for 4 h. The reaction was then warmed to 25° C. and was stirred at 25° C. for 48 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (5 mL). The reaction mixture was poured into water (100 mL) and extracted with ethyl acetate (2×100 mL). The organics were washed with a saturated aqueous lithium chloride solution (2×50 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-phenyl-propionic acid ethyl ester (1.70 g, quant.) as a pale yellow oil: EI-HRMS m/e calcd for C16H22O2 (M+) 247.1698, found 247.1704.

1. stirringThe mixture was stirred at −78° C. for 4 h
2. temperatureThe reaction was then warmed to 25° C.
3. stirringwas stirred at 25° C. for 48 h
4. customThe reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (5 mL)
5. additionThe reaction mixture was poured into water (100 mL)
6. extractionextracted with ethyl acetate (2×100 mL)
7. washThe organics were washed with a saturated aqueous lithium chloride solution (2×50 mL)
8. dry with materialdried over magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo

ORD record

ord-d530b2ac4c9d49dd98b4ced58cd3179f

Source dataset

uspto-grants-2003_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06528543B1