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oven1986: ½ð±Ò+1, ¸ÐлӦÖú¡£ 2013-07-31 00:08:23
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.


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5Â¥: Originally posted by baiyuefei at 2013-07-30 16:49:38
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.  Synthesi ...

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