Sodium hydride → 2-(2-Ethyl-2-trifluoromethyl-6-nitro-3,4-dihydro-2H-1,4-benzoxazine-4-yl)pyridine-N-oxide

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Reaction Steps

Sodium hydride (0.68 g, 60% in mineral oil) was added to a solution of 2-ethyl-2-trifluoromethyl-6-nitro-3,4-dihydro-2H-1,4-benzoxazine (0.235 g), 2-chloropyridine-N-oxide hydrochloride (0.142 g), and dimethylsulfoxide (10 mL) and stirred at room temperature overnight. The mixture was quenched with saturated ammonium chloride/water and extracted into ethyl acetate. The organic extract was washed (water, brine) dried, decolorized (charcoal), filtered (celite) and evaporated. Chromatography, eluting successively with dichloromethane, ethyl acetate, and then methanol, gave the title compound as a yellow solid (0.11 g); mp 59°-62 ° C.; NMR: 0.95 (t,3), 2.04 (q), 4.05 (d,d), 7.01 (s,1), 7.25 (d) 7.45 (m, 2), 7.63 (d), 7.76 (d), 8.41 (d,1); MS: m/z=370(M+1). Analysis for C16H14F3N3O4 : Calculated: C, 52.04; H, 3.82; N, 11.38; Found: C, 51.95; 3.98; N, 11.10.

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