Methyl iodide → 2-[3-(Tert-butyldimethylsilanyloxy)-4,4,4-trifluoro-1,1-dimethylbutyl]pyridine

Temperature

-50 °C

To a solution of 3.87 mL (3.87 mmol, 1.5 eq.) of potassium tert-butoxide (1.0 M solution in THF) and 542 μL (3.87 mmol, 1.5 eq.) of diisopropylamine, 1.55 mL (3.87 mmol, 1.5 eq) of n-butyl lithium (2.5 M solution in hexanes) was added dropwise at −75° C. The resulting mixture was allowed to warm to −50° C. over 15 minutes. Then the reaction mixture was treated with 860 mg (2.58 mmol) of 2-[3-(tert-butyldimethylsilanyloxy)-4,4,4-trifluoro-1-methylbutyl]pyridine at −50° C. and the resulting mixture was stirred for 30 minutes at −50° C. The reaction mixture was cooled to −75° C. and treated with 482 μL (7.74 mmol) of methyl iodide and stirred for 1 minute. The reaction mixture was quenched with saturated NH4Cl solution and the product was extracted into ether. The ethereal layer was washed with water and brine, dried over magnesium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash chromatography to give 555 mg (62%) of 2-[3-(tert-butyldimethylsilanyloxy)-4,4,4-trifluoro-1,1-dimethylbutyl]pyridine as a colorless oil.

1. temperatureThe reaction mixture was cooled to −75° C.
2. stirringstirred for 1 minute
3. customThe reaction mixture was quenched with saturated NH4Cl solution
4. extractionthe product was extracted into ether
5. washThe ethereal layer was washed with water and brine
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was purified by flash chromatography

ORD record

ord-c3dbe07624a14bff8082ffdad66b52d3

Source dataset

uspto-grants-2011_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07932392B2