2-Chloro-3-methylquinoxaline 4-oxide

Chloro-3-methylquinoxaline 4-oxide gave 3-chloro-2-quinoxalinecarbalde-hyde 1-oxide (172) (SeOi, PhH, reflux, h 72%) dioxane may be used as solvent for such oxidations yielding, for example, 3-amino-2-quinoxaline-carbaldehyde ethyl acetate may also be so used. [Pg.124]

Chloro-l-methyl-2,3(177,4//)-q uinoxalinedionc 6-Chloro-4-methyl-2,3(1/7,4/7)-quinoxalinedione 6-Chloro-7-methyl-2,3(1/7,4/7)-quinoxalinedione 2-Chloro-3-methylquinoxaline 1,4-dioxide 6-Chloro-3-methylquinoxaline 1,4-dioxide 6-Chloro-7-methylquinoxaline 1,4-dioxide 2-Chloro-3-methylquinoxaline 1-oxide 2-Chloro-3-methylquinoxaline 4-oxide... [Pg.384]

Chloro-3-methylquinoxaline gave only 2-chloro-4-methylquinoxaline 4-oxide (241) (m-ClC6H4C03H, CHCI3, 20°C, 6 h 82%). °... [Pg.228]

Chloro-3-methylquinoxaline (166) gave 2-methyl-3-phenylsulfonylquinoxa-line (167) (PhS02Na, Et3N+CH2Ph Cl, MeCN, reflux, 10 h 81% identified with that produced by oxidation of 2-methyl-3-phenylthioquinoxaline see Section 5.2.2) 996 likewise 2-phenylsulfonyl-3-styrylquinoxaline (80%) and... [Pg.164]

Chloro-5-methoxy-3-methylquinoxaline 2-Chloro-8-methoxy-3-methylquinoxaline 6-Chloro-5-methoxy-3-oxo-3,4-dihydro-2-quinoxalinecarbonitrile 1-oxide... [Pg.382]

Chloro-6-methylquinoxaline 4-oxide 6-Chloro-7-methylquinoxaline 1-oxide... [Pg.384]

Chloroquinoxalines have also been prepared from quinoxaline mono-N-oxides. For example, treatment of 5-methylquinoxaline 1-oxide with phosphoryl chloride gives 2-chloro-5-methylquinoxaline, and reaction of... [Pg.163]

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