Triethylamine → 2-(2,3,6-Trifluoro-benzylidene)-malonic Acid Dimethyl Ester

Participants

Reaction Steps

2-[Hydroxy-(2,3,6-trifluoro-phenyl)-methyl]-malonic acid dimethyl ester (13 g, 44.5 mmol) and NEt3 (99, 89 mmol) were dissolved in 300 mL CH2Cl2. MsCl (10.3 g, 89 mmol) was then added. The reaction mixture was stirred at room temperature for 1 hour. The reaction mixture washed with 1N HCl solution (200 mL×2), brine (100 mL), dried over Na2SO4 and concentrated. The product was purified by column chromatography using EtOAc/Hexane as eluent (gradient from 0/100 to 25/75 in 40 min, 6.5 g, 53%). 1H NMR (CDCl3 400 MHz) δ 7.71 (s, 1H), 7.20 (m, 1H), 6.89 (m, 1H), 3.87 (s, 3H), 3.80 (s, 3H).

Provenance & Evidence