Cycloaddition of sulfonyl azides and cyanogen azide to enamines. Quantum-chemical calculations concerning the spontaneous rearrangement of the adduct into ring-contracted amidines |
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Authors: | Gérard Audran Chiaa Adiche Paul Brémond Douniazad El Abed Mohammed Hamadouche Didier Siri Maurice Santelli |
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Institution: | 1. Aix Marseille Univ, CNRS, ICR, Marseille, France;2. Laboratory of Fine Chemistry (L.F.C.), Chemistry Department, University of Oran 1 Ahmed BenBella, Algeria |
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Abstract: | Enamines derived from cyclic ketones react with arenesulfonyl azides and cyanogen azide, mainly via ring contraction, with formation of the corresponding amidines. The mechanism of this efficient rearrangement, which has not been investigated experimentally, was determined with the aid of quantum-chemical calculations. In the transition state, from the intermediate 5-amino-v-triazolines, the loss of dinitrogen and a cyclic rearrangement occurred in one-step in a quite synchronous manner with a very low transition state energy. |
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Keywords: | Enamines Azides Amidines Ring contraction Quantum chemical calculations |
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