Methane → 2-Trimethylsilylthiazole

Temperature

-90 °C

To a cooled solution (-98° C.) of n-butyllithium (2.5M in hexane, 5.39 mL, 13.4 mmol, 1.1 eq) in tetrahydrofuran (100 mL) under nitrogen was added a solution of 2-bromothiazole (2.00 g, 12.2 mmol) in tetrahydrofuran (30 mL). A suspension formed as the substrate was added. After stirring at -90° C. for 30 min, freshly distilled trimethylsilyl chloride (1.55 mL, 12.2 mmol, 1.0 eq) was added. The reaction was warmed to -30° C. over 1 h and quenched with saturated aqueous sodium bicarbonate (50 mL). The aqueous phase was extracted with diethyl ether (2×40 mL). Combined organic extracts were washed with aqueous bicarbonate (2×40 mL), saturated brine (1×40 mL) and dried with anhydrous sodium sulfate. The solvents were removed and the product purified by Kugelrohr distillation at reduced pressure (2400 pascal, 110° C.). By NMR the title compound was contaminated with small amounts of starting material but no further purification was considered necessary. No accurate yield was established. MS (CI, CH4) m/z 158 (M+1,100), 186 (M+29,17)

1. customA suspension formed as the substrate
2. additionwas added
3. temperatureThe reaction was warmed to -30° C. over 1 h
4. customquenched with saturated aqueous sodium bicarbonate (50 mL)
5. extractionThe aqueous phase was extracted with diethyl ether (2×40 mL)
6. washCombined organic extracts were washed with aqueous bicarbonate (2×40 mL), saturated brine (1×40 mL)
7. dry with materialdried with anhydrous sodium sulfate
8. customThe solvents were removed
9. distillationthe product purified by Kugelrohr distillation at reduced pressure (2400 pascal, 110° C.)
10. customno further purification
11. customNo accurate yield

ORD record

ord-46f8519ce3a94dfd9466c7960151c49f

Source dataset

uspto-grants-1997_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05681840