Cyclopentanol → HCID 21876980, compound

Temperature

80 °C

To a mixture of cyclopentanol (51.1 ml, 0.56 mol) and dioxane (50 mL) was added sodium hydride (60% in mineral oil, 4.91 g, 0.12 mol) at 0-5° C. under argon. The mixture was heated at 80° C. until an homogenous solution was observed. 2-Bromothiophene (10 g, 5.9 mL, 0.061 mol) was added at 80° C., followed by cuprous iodide (11.7 g, 0.061 mol). The mixture was heated at 120° C. for 6 hours. After cooling to 20-25° C., sodium cyanide (30 g, 0.61 mol) in water (200 mL) was added. The mixture was vigorously stirred for 20 minutes, filtered, and extracted with hexane. The hexane extract was washed with water, dried (Na2SO4), and concentrated to dryness. Filtration through a column (silica, 100% hexane) gave 2-cyclopentyloxythiophene (2.6 g, 25.2%) as a colorless oil; 1H NMR (300 MHz, CDCl3) δ 6.7 (dd, J=5.7, 3.7 Hz, 1H), 6.54 (dd, J=5.7, 1.5 Hz, 1H), /86.18 (dd, J=3.7, 1.5 Hz, 1H), 4.66 (Sept, J=2.7 Hz, 1H), 1.5-2.0 (m, 8H).

1. temperatureThe mixture was heated at 120° C. for 6 hours
2. temperatureAfter cooling to 20-25° C.
3. filtrationfiltered
4. extractionextracted with hexane
5. extractionThe hexane extract
6. washwas washed with water
7. dry with materialdried (Na2SO4)
8. concentrationconcentrated to dryness
9. filtrationFiltration through a column (silica, 100% hexane)

ORD record

ord-5158d95d0de247a09a07656489413465

Source dataset

uspto-grants-2004_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06693200B2