反应详情

温度

-40 °C

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), to a solution of 2-[1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-oxazole (733 mg, 3.22 mmol) in dry THF (16 mL) was added tert-BuLi (2.62 mL of a 1.6 M solution in pentane, 4.19 mmol) at −78° C. The reaction mixture was then stirred for 1 h at −40° C. and cooled to −78° C. before N,N-dimethylformamide (0.49 mL, 6.44 mmol) was added dropwise. The reaction mixture was allowed to warm up to rt over a period of 1 h and stirred at this temperature for 2 h. Water (30 mL) and sat. aq. NH4Cl (20 mL) were added, the layers separated and the aq. layer extracted with EA (2×30 mL). The combined org. extracts were dried over MgSO4, filtered, and the solvent was removed under reduced pressure. Purification of the residue by FC (4:1 hept-EA) gave the title compound as a colorless oil. TLC:rf (4:1 hept-EA)=0.33. LC-MS-conditions 02: tR=1.08 min; [M+H]+=256.37.

1. additionwas added dropwise
2. temperatureto warm up to rt over a period of 1 h
3. stirringstirred at this temperature for 2 h
4. customthe layers separated
5. extractionthe aq. layer extracted with EA (2×30 mL)
6. dry with materialextracts were dried over MgSO4
7. filtrationfiltered
8. customthe solvent was removed under reduced pressure
9. customPurification of the residue by FC (4:1 hept-EA)