Upon base treatment with silver carbonate, isoxazolyl-substituted hydrazonoyl chlorides (4) and (12) undergo a sequential intra- intermolecular nitrilimine cycloaddition giving tetracyclic pyrazolydine derivatives (7) and (15).
Dipolarophilic behavior of the isoxazole ring in intramolecular nitrilimine cycloadditions / G. Broggini, L. Garanti, G. Molteni, G. Zecchi. - In: HETEROCYCLES. - ISSN 0385-5414. - 53:4(2000), pp. 831-839.
Dipolarophilic behavior of the isoxazole ring in intramolecular nitrilimine cycloadditions
G. Molteni;
2000
Abstract
Upon base treatment with silver carbonate, isoxazolyl-substituted hydrazonoyl chlorides (4) and (12) undergo a sequential intra- intermolecular nitrilimine cycloaddition giving tetracyclic pyrazolydine derivatives (7) and (15).
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