C1([CH:7]2O[C:15]3[C:10](=[N:11][C:12]([CH:17]=C)=[CH:13][CH:14]=3)[CH2:9][O:8]2)C=CC=CC=1.Cl[C:20]1[CH:25]=[CH:24][CH:23]=[C:22]([C:26]([O:28]O)=[O:27])[CH:21]=1.ClC1C=C(C=CC=1)C(O)=[O:35]>C(Cl)Cl>[O:8]1[CH2:7][CH:9]1[C:10]1[N+:11]([O-:35])=[C:12]2[CH2:17][O:27][CH:26]([C:22]3[CH:23]=[CH:24][CH:25]=[CH:20][CH:21]=3)[O:28][C:13]2=[CH:14][CH:15]=1In a 4-neck 500 ml., round bottom flask, fitted with a reflux condenser, a mechanical stirrer/magnetic stirring bar and a thermometer, was placed 2-phenyl-6-vinyl-4H-1,3-dioxino[5,4-b]pyridine (8.0 g., 0.033 mole) in methylene chloride (250 ml.). The solution was treated portion wise with m-chloroperbenzoic acid (20.0 g., 0.116 mole). When all of the peracid was added, the solution was heated at reflux overnight. Upon cooling m-chlorobenzoic acid crystallized from the reaction mixture and was filtered off. The filtrate was washed with aqueous sodium bicarbonate solution, dried over anhydrous magnesium sulfate and evaporated in vacuo to give the crude product (5.1 g.) which was recrystallized from ethyl acetate to give 6-(1,2-epoxyethyl)-2-phenyl-4H-1,3-dioxino[5,4-b]pyridine N-oxide (1.9 g., 21%), m.p. 180°-181.5° C. (dec.); NMR (CDCl3) delta 7.28 (m, 5H), 6.82 (q, 2H), 5.82 (s, 1H), 5.05 (s, 2H), 4.40 (d of d, 1H), 3.18 (d of d, 1H), 2.97 (d of d, 1H); mass spec (70 eV), m/e 217 (M+), 241 (M-O, CH2), 206, 165, 149, 132, 107, 105, 101, 82, 80, 79, 77.
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