Iodine → (2R)-2,6-dimethylheptan-1-ol

Magnesium turnings (2.04 g, 84 mmol) and a crystal of iodine were suspended in 5 mL THF for the addition of 1-bromo-3-methyl butane (0.3 mL, neat). The mixture was heated to start the Grignard formation. The remaining 1-bromo-3-methyl butane (8.63 mL, 72 mmol) was diluted in THF (60 mL) and added dropwise. The mixture was stirred at ambient temperature for 2 hours and cooled to −5° C. A solution of copper chloride (1.21 g, 9 mmol) and LiCl (0.76 g, 18 mmol) in THF (50 mL) was added dropwise keeping the temperature below 0° C. The resulting mixture was stirred for 20 min, and (R)-3-bromo-2-methylpropanol in THF (20 mL) was added dropwise while keeping the temperature below 0° C. The mixture was allowed to slowly reach ambient temperature overnight. The reaction mixture was quenched with ammonium hydroxide and water. The mixture was diluted with EtOAc and extracted with 3×20 mL EtOAc. The organics were washed with brine, dried (MgSO4), filtered and concentrated. The residual oil was purified via silica gel chromatography (90/10 Hexane/EtOAc) to give 2.67 g (R)-2,6-dimethyl heptan-1-ol.

1. temperatureThe mixture was heated
2. additionadded dropwise
3. temperaturecooled to −5° C
4. customthe temperature below 0° C
5. stirringThe resulting mixture was stirred for 20 min
6. customthe temperature below 0° C
7. customwas allowed to slowly reach ambient temperature overnight
8. customThe reaction mixture was quenched with ammonium hydroxide and water
9. additionThe mixture was diluted with EtOAc
10. extractionextracted with 3×20 mL EtOAc
11. washThe organics were washed with brine
12. dry with materialdried (MgSO4)
13. filtrationfiltered
14. concentrationconcentrated
15. customThe residual oil was purified via silica gel chromatography (90/10 Hexane/EtOAc)

ORD-Eintrag

ord-c2d992af70f546238294c7b84d471bfd

Quelldatensatz

uspto-grants-2008_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07419981B2