反应详情

温度

100 °C

2-Bromo-4-chlorothieno[3,2-c]pyridine (5.0 g, 20.24 mmol) and K2CO3 (13.97 g, 101.2 mmol) was stirred in DMSO (20 mL) followed by addition of tert-butyl piperazine-1-carboxylate (4.14 g, 22.26 mmol). The reaction mixture was stirred at 100° C. for 6 days. The reaction mixture was filtered to eliminate the carbonate and addition of water (50 mL) and ethyl was followed. The phases were separated and the aqueous phase was extracted with ethyl acetate. The combined organic phases were dried (MgSO4) and the solvent was evaporated. The crude product was purified by flash chromatography using ethyl acetate/hexanes (2/8) as eluent to give 2 g of the desired product, yield 25%, 99% pure. 1H NMR (270 MHz, CDCl3) δ 1.48 (s, 9H), 1.52-1.63 (m, 1H), 3.42-3.47 (m, 4H), 3.61-3.64 (m, 4H), 7.22 (dd, J=5.4, 1 Hz, 1H), 7.35 (d, J=1 Hz, 1H), 8.04 (d, J=5.4 Hz, 1H). m/z=398.91 (M+H), bromide pattern.

1. filtrationThe reaction mixture was filtered
2. additionthe carbonate and addition of water (50 mL) and ethyl
3. customThe phases were separated
4. extractionthe aqueous phase was extracted with ethyl acetate
5. dry with materialThe combined organic phases were dried (MgSO4)
6. customthe solvent was evaporated
7. customThe crude product was purified by flash chromatography