Reaktionen von 1, 3??Dipolen mit Heterocyclen, 8. Synthese von 1, 8a??Dihydro [1, 2, 4] triazolo [4, 3??a] pyridinen und Benzologen

…, H Köppel, U Strietzel, A Dombrowski

Index: Grubert, Lutz; Jugelt, Werner; Bress, Hans Joachim; Koeppel, Hubert; Strietzel, Ute; Dombrowski, Anke Liebigs Annalen der Chemie, 1992 , # 9 p. 885 - 894

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Abstract

1, 8a-dihydro [l, 2, 4] triazolo [4, 3-a] pyridines 3, 1, 3-diaryl-3, 3a-dihy-dro [l, 2, 4] triazolo [4, 3-~] quinolines 4, and 1, 3-diaryl-l, lOb-dihy-dro [l, 2, 4] triazolo [3, 4-a] isoquinolines 5 has been developed. In a similar way, cycloadditions are carried out with C-ethoxycarbonyl-and C-acetyl-N-phenylnitrilimines. The ring cleavage of 3 in acidic medium yields the corresponding [(arylhydrazono) methyl] pyridinium chlorides 7. The conversion of the ...