2-(Bromomethyl)acrylic acid ethyl ester → Ethyl 2-(6-fluoro-3-methoxy-2-nitrobenzyl)acrylate

Participants

Reaction Conditions

Reaction Steps

4-Fluoro-1-methoxy-2-nitrobenzene (21) (171 mg, 1.0 mmol) in THF (2 mL) was added to a solution of TMPZnCl.LiCl (2) (1.3 M in THF, 0.85 mL, 1.1 mmol) at 25° C. and the reaction mixture was then stirred at this temperature for 6 h according to TP 2. After cooling down to −50 ° C., ethyl 2-(bromomethyl)acrylate (230 mg, 1.2 mmol) and CuCN.2LiCl (1.0 M solution in THF, 5 drops) were added at −40° C. and the resulting mixture was stirred at the same temperature for 1 h. The reaction mixture was quenched with a sat. aq. NH4Cl solution (20 mL), extracted with diethyl ether (3×50 mL) and dried over anhydrous Na2SO4. After filtration, the solvent was evaporated in vacuo. Purification by flash-chromatography (CH2Cl2/n-pentane, 1:3) furnished compound 23 (189 mg, 67%) as a colourless oil.

Provenance & Evidence