Heptane → HCID 86665238, Verbindung

Temperatur

50 °C

An aqueous solution of sodium hydroxide (50% (w/w), 6 ml) was added portionwise to a mixture of (5Z,8Z,11Z,14Z,17Z)-icosa-5,8,11,14,17-pentaen-1-ol (2.01 g, 6.39 mmol), tert-butyl-2-bromobutyrat (2.85 g, 12.8 mmol) and tetrabutylammonium bisulfate (0.65 g, 1.91 mmol) in toluene (12 ml). The reaction mixture was vigorously stirred under N2-atmosphere and warmed to 50° C. The reaction mixture was stirred at 50° C. for a total of 22 hrs. Additional tert-butyl-2-bromobutyrat (1.43 g, 6.39 mmol) and (1.44 g, 6.44 mmol) was added after 1½ hrs and 3 hrs respectively. The mixture was cooled and added ice-water (˜50 ml) and heptane (50 ml), the phases were separated and the organic phase was concentrated under reduced pressure. Flash chromatography on silica gel (30 g) eluting with heptane-heptane/EtOAc (99:1) yielded 2.12 g of the title compound as a liquid. 1H NMR (300 MHz, CDCl3) δ 0.94-1.04 (m, 6H), 1.47 (s, 9H), 1.68-1.85 (m, 4H), 1.93-2.20 (m, 4H), 2.80-2.86 (m, 10H), 3.28-3.36 (m, 1H), 3.55-3.63 (m, 2H), 5.27-5.43 (m, 12H)

1. stirringThe reaction mixture was stirred at 50° C. for a total of 22 hrs
2. temperatureThe mixture was cooled
3. customthe phases were separated
4. concentrationthe organic phase was concentrated under reduced pressure
5. washFlash chromatography on silica gel (30 g) eluting with heptane-heptane/EtOAc (99:1)

ORD-Eintrag

ord-b3fcf8b52cd84787bd91e839da111cca

Quelldatensatz

uspto-grants-2014_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08735436B2