Bromide ion → 2-[1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5-(3-nitro-pyrazol-1-ylmethyl)-oxazole

Participants

Reaction Steps

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of 2-[1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-5-chloromethyl-oxazole (243 mg, 0.88 mmol), 5-nitro-1H-pyrazole (100 mg, 0.88 mmol) and TBA bromide (57 mg, 0.18 mmol) in acetone (2.0 mL) was treated with K2CO3 (365 mg, 2.64 mmol) and the reaction mixture was stirred at rt until completion. The solvent was removed under reduced pressure and water (10 mL) followed by EA (10 mL) were added. The aq. layer was extracted with EA (10 mL) and the combined org. extracts were dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Purification of the residue by FC (6:4 hept-EA) gave the title compound as a yellow oil. TLC: rf (6:4 hept-EA)=0.20. LC-MS-conditions 01: tR=1.09 min, [M+H]+=353.02.

Provenance & Evidence