Dimethylformamide → Methyl 2-(3-chloro-4-cyanophenyl)acetate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of (3-chloro-4-trifluoromethanesulfonyloxy-phenyl)-acetic acid methyl ester 12 (24.5 g, 73.6 mmol) in dry DMF (45 mL) is combined with zinc cyanide (8.91 g, 75.9 mmol) and tetrakis(triphenylphosphine) palladium (8.50 g, 7.4 mmol). The mixture is stirred for 34 hours at 80° C., then cooled to room temperature, diluted with EtOAc (150 mL) and poured into a saturated NaHCO3 solution (150 mL). A white precipitate is removed by vacuum filtration. The organic layer of the filtrate is separated and washed with H2O. The organic layer is dried (MgSO4), filtered and concentrated. The remainder is purified by silica gel chromatography using 20% EtOAc/hexane to give (3-chloro-4-cyano-phenyl)acetic acid methyl ester 13 as a wax-like solid: 1H-NMR (400 MHz, CDCl3) δ=7.63 (d, J=8.0 Hz, 1H), 7.47 (d, J=1.2 Hz, 1H), 7.30 (dd, J=1.2 Hz, J=8.0 Hz, 1H), 3.72 (s, 3H), 3.69 (s, 2H). MS calculated for C10H9O2ClN (M+H+) 210.0, found 210.0.

Herkunft & Nachweise