Water → HCID 57995528, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of diethyl malonate (18.0 g, 114.9 mmol) in DMF (50 mL) was added sodium hydride (60% in mineral oil, 3.0 g, 125.0 mmol) at 0° C. The reaction mixture was stirred at 25° C. for 0.5 h and a solution of 5-fluoro-2-nitro-1,3-bis-(2,2,2-trifluoro-ethoxy)-benzene (18.0 g, 53.4 mmol) in DMF (30 mL) was added dropwise. The reaction mixture was heated 100° C. for 24 h. After cooling the reaction mixture was poured into water (300 mL) and extracted with EtOAc (3×50 mL). The combined organic phases were washed with water (3×100 mL), brine (100 mL) and dried (MgSO4). Evaporation of the solvent under reduced pressure gave 2-[4-nitro-3,5-bis-(2,2,2-trifluoro-ethoxy)-phenyl]-malonic acid diethyl ester as a brown oil (20.8 g, 80%). The crude product was used for the next step without purification. 1H NMR (300 MHz, CDCl3/TMS): δ 6.91 (s, 2H), 4.62 (s, 1H), 4.48 (q, J=8.0 Hz, 4H), 4.28-4.16 (m, 4H), 1.31-1.25 (m, 6H). 13C NMR (75 MHz, CDCl3/TMS): δ 166.4, 149.2, 136.7, 132.3, 122.3 (q, 1JCF=276.6 Hz), 109.5 (two signals), 67.0 (q, 2JCF=36.7 Hz), 61.4, 41.6, 14.0.

Provenance & Evidence