Etude de la reactivite de l'ion azoture vis á vis de cations heterocycliques-III: Rearrangements thermiques et photochimiques des azides covalents resultant de l'attaque de l'ion azoture sur des cations pyrylium et thiopyrylium diversement substitues. nouvel acces à des heteroazepines

作者: P.-L Desbene , J.-C Cherton

DOI: 10.1016/S0040-4020(01)91508-X

关键词:

摘要: Resume Les azidopyrannes, instables, se rearrangent spontanement temperature ambiante en oxazeines-1,3 offrant ainsi une nouvelle voie d'acces a ces composes. Par centre les azidothiopyrannes, stables 25° donnent lieu par chauffage la formation transitoire de thiazines instables dans conditions et qui conduisent extrusion du soufre aux pyridines correspondantes elimination d'une molecule benzonitrile thiophenes correspondants. L'activation photochimique azidothiopyrannes ne permet pas davantage l'isolement des thiazepines

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