Imidazole → (3R)-3-(tert-butyldimethylsilyloxy)-1-hexene

3.8 g (24 mmol) of tert-butyldimethylsilyl chloride were added at −10° C. over the course of 10 minutes in 5 portions to a stirred solution of 2.05 g (20.5 mmol) of (3R)-1-hexen-3-ol and 3.4 g (49 mmol) of imidazole in 50 ml of dry dimethylformamide. After 3 hours at 0° C., the reaction mixture was poured into 200 ml of saturated aqueous sodium hydrogen carbonate solution. The mixture was extracted three. times with 50 ml of n-hexane in each case. The combined organic phases were washed with water and concentrated sodium chloride solution. After drying over anhydrous sodium sulfate and removing the solvent, the residue was chromatographed on 300 g of silica gel. The eluent used was a mixture of 5% by volume ethyl acetate in n-hexane. (3R)-3-(tert-butyldimethylsilyloxy)-1-hexene was obtained as a colorless oil in 91.6% yield ([α]D19=−5.3° (c=2.4 in trichloromethane)).

1. extractionThe mixture was extracted three
2. washThe combined organic phases were washed with water and concentrated sodium chloride solution
3. dry with materialAfter drying over anhydrous sodium sulfate
4. customremoving the solvent
5. customthe residue was chromatographed on 300 g of silica gel
6. additiona mixture of 5% by volume ethyl acetate in n-hexane

ORD record

ord-ba1e91c67a1b4cebbc14b107dccf0846

Source dataset

uspto-grants-2001_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06245328B1