Carbon tetrabromide → 3-(3-Bromopropyl)oxolane

Temperatur

0 °C

3-(Tetrahydro-3-furanyl)-1-propanol (1 g, 7.68 mmol) was dissolved in DMF (10 ml) and carbon tetrabromide (5.09 g, 15.36 mmol) added. The solution turned yellow. The solution was cooled to 0° C. and triphenylphosphine (4.03 g, 15.36 mmol) added dropwise as a solution in DMF (20 ml) (˜30 mins, temperature maintained <2° C. throughout). The reaction mixture was stirred at 0° C. for 1 hour before gradually allowing to warm to room temperature and stirred for a further 2 hours. The solvent was removed in vacuo. Attempted trituration of the resultant brown oil with either DCM or cyclohexane was unsuccessful. The solvent was removed and the oil diluted with DCM and was purified by chromatography on silica (100 g) using a 0-25% ethyl acetate-cyclohexane over 40 mins using a Flashmaster II. The appropriate fractions were combined and dried down to give the title compound as a yellow oil (0.676 g).

1. temperatureto warm to room temperature
2. stirringstirred for a further 2 hours
3. customThe solvent was removed in vacuo
4. customThe solvent was removed
5. additionthe oil diluted with DCM
6. customwas purified by chromatography on silica (100 g)
7. customover 40 mins
8. customdried down

ORD-Eintrag

ord-b3facf7a93cc4dd9af532704a2a6d596

Quelldatensatz

uspto-grants-2011_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07977344B2