反应详情

温度

-78 °C

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of 5-(3-nitro-pyrazol-1-ylmethyl)-furan-2-carbaldehyde (10.50 g, 47.47 mmol) in THF (479.2 mL) was treated at −78° C. with methylmagnesium bromide (47.47 mL of a 1M solution in THF, 47.47 mmol). The reaction mixture was stirred at −78° C. for 4 h. It was then poured in sat. aq. NH4Cl (450 mL). The aq. phase was extracted with EA (2×500 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 (50:50 hept-EA) gave the title compound as a mixture with 5-(3-nitro-pyrazol-1-ylmethyl)-furan-2-carbaldehyde. TLC: rf (50:50 hept-EA)=0.24. LC-MS-conditions 02: tR=0.78 min. 1H NMR (400 MHz, CDCl3) characteristic signals 81.53 (d, J=6.5 Hz, 3H), 2.15-2.24 (m, 1H), 4.81-4.91 (m, 1H), 5.35 (s, 2H), 6.24 (d, J=3.0 Hz, 1H), 6.43 (d, J=3.3 Hz, 1H), 6.89 (d, J=2.3 Hz, 1H), 7.49 (d, J=2.5 Hz, 1H).

1. extractionThe aq. phase was extracted with EA (2×500 mL)
2. dry with materialextracts were dried over MgSO4
3. filtrationfiltered
4. customthe solvents were removed under reduced pressure
5. customPurification of the residue by FC (50:50 hept-EA)