反应详情

To a stirred suspension of ethyl 3-methyl-5-(2-oxoimidazolidin-1-yl)thiophene-2-carboxylate (0.85 g, 3.33 mmol) in anhydrous N,N-dimethylformamide (8 mL) under nitrogen atmosphere was added in one portion sodium hydride (60% in mineral oil, 0.16 g, 4.00 mmol). The resulting reaction mixture was stirred at ambient temperature for 1 h, and then (2-bromoethoxy)(tert-butyl)dimethylsilane (0.86 mL, 4.01 mmol) was added. The resulting reaction mixture was stirred at ambient temperature for 16 h, and then partitioned between ethyl acetate (100 mL), water (35 mL) and brine (35 mL). The aqueous layer was extracted with ethyl acetate (100 mL), and the combined organic layer was dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by column chromatography eluted with 0-30% ethyl acetate in hexanes to afford the title compound as a colorless solid in 79% yield (1.09 g): 1H NMR (300 MHz, CDCl3) δ 6.13 (s, 1H), 4.26 (q, J=7.1 Hz, 2H), 3.85-3.69 (m, 6H), 3.41 (t, J=5.2 Hz, 2H), 2.49 (s, 3H), 1.33 (t, J=7.1 Hz, 3H), 0.89 (s, 9H), 0.06 (s, 6H): MS (ES+) m/z 413.4 (M+1).

1. customThe resulting reaction mixture
2. customThe resulting reaction mixture
3. stirringwas stirred at ambient temperature for 16 h
4. custompartitioned between ethyl acetate (100 mL), water (35 mL) and brine (35 mL)
5. extractionThe aqueous layer was extracted with ethyl acetate (100 mL)
6. dry with materialthe combined organic layer was dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was purified by column chromatography
10. washeluted with 0-30% ethyl acetate in hexanes