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Journal of Chemical Research, Synopses Issue1 Pages16-17 Journal 1986 CODEN:JRPSDC ISSN:0308-2342 Quinoxaline chemistry. Part 1. 6-Trifluoromethylquinoxalines and their N-oxides. Synthesis and structure elucidation By: Loriga, Mario; Paglietti, Giuseppe The title compds. I (R ¡Ù R1 = H, Ph; Me, Ph; Cl, Ph) were prepd. from 3,4-(H2N)2C6H3CF3 (II). E.g., cyclocondensation of II with PhCOCHO in refluxing EtOH for 3 h gave 45% I (R = Ph, R1 = H) (III) and 39% I ( R = H, R1 = Ph) (IV), whereas similar reaction in the presence of HCl gave 90% III, exclusively. I were oxidized at the less hindered N atom to give the corresponding N-oxides. E.g., treatment of III with H2O2 in HCO2H at 50¡ã overnight gave 85% N-oxide V , whereas similar treatment of IV gave 80% N-oxide VI. Äã¿´ÏÂÕâÆªÎÄÏ×È«ÎÄ |
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