Cesium carbonate → 3-(3'-(Ethylsulfonyl)-4-methyl-3-nitro-5-(trifluoromethyl)biphenyl-2-yl)-2-fluoro-5-methylpyridine

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Reaction Steps

A mixture of 3-(6-chloro-3-methyl-2-nitro-4-(trifluoromethyl)phenyl)-2-fluoro-5-methylpyridine (6.0 g, 17.2 mmol), 3-ethylsulfonylphenylboronic acid (4.79 g, 22.4 mmol), bis(dibenzylidineacetone)Pd(0) (1.48 g, 2.6 mmol), tricyclohexylphosphine (1.45 g, 5.2 mmol), Cs2CO3 (14.0 g, 43 mmol), and dioxane (60 mL) was heated at reflux for 4.5 hr. After completion the reaction was cooled to room temperature, filtered, rinsed with dioxane, and concentrated in vacuo. The resulting oil was reconstituted in EtOAc (75 mL) washed with H2O (1×30 mL) and brine (1×30 mL), dried (MgSO4), and concentrated in vacuo. Purification by silica gel chromatography (4:1 hexanes/EtOAc) gave 6.5 g (78%) of the title compound as a tan solid. 1H NMR (400 MHz, DMSO-d6): δ 8.15 (s, 1H), 8.04 (s, 1H), 7.90-7.93 (m, 1H), 7.80-7.82 (m, 1H), 7.60-7.70 (m, 3H), 3.1-3.2 (m, 2H), 2.49 (s, 3H), 2.25 (s, 3H), 0.85 (t, 3H). MS (ES) [m+H] calc'd for C22H18F4N2O4S, 483; found 483.3.

Provenance & Evidence