Triethylamine → 5-Bromo-2-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-4-methyl-pyridine

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Reaction Steps

To a solution of the compound obtained in Step C (2.2 g) in dimethylformamide (24 ml) was added N-chlorosuccinimide (1.4 g) in three portions at room temperature under argon. The reaction mixture was allowed to stir overnight at room temperature then a solution of 1,3-dichloro-5-(1-trifluoromethyl-vinyl)-benzene (2.7 g, prepared as described in WO 2009/080250) in DMF (6 ml) was added followed by triethylamine (1.43 ml) in DMF (14 ml). The reaction stirred at room temperature for 1 hour then poured into ice water. A white solid precipitated, which was filtered, washed with water and dried under vacuum to give the title product (4.1 g). 1H-NMR (CDCl3, 400 MHz): 8.60 (s, 1H), 7.90 (s, 1H), 7.50 (s, 2H), 7.40 (s, 1H), 4.20 (d, 1H), 3.85 (d, 1H), 2.45 (s, 3H),

Provenance & Evidence