Isomerization of substituted tricyclic 4,5-dihydropyrazoles
摘要:
The acid and base catalyzed isomerization of some tricyclic 2-pyrazolines with N-Carbamoyl-, N-thiocarbamoyl- and N-phenyl substituents was investigated. Starting from cis or trans 3-H, 3a-H diastereomers, equilibrium mixtures of cis and tl ans diastereomers were prepared which were separated and subsequently studied by H-1 NMR and C-13 NMR spectroscopy. A mechanism for the isomerization of the pyrazolines is suggested, supported by a deuterium exchange at C-3a.
The acid and base catalyzed isomerization of some tricyclic 2-pyrazolines with N-Carbamoyl-, N-thiocarbamoyl- and N-phenyl substituents was investigated. Starting from cis or trans 3-H, 3a-H diastereomers, equilibrium mixtures of cis and tl ans diastereomers were prepared which were separated and subsequently studied by H-1 NMR and C-13 NMR spectroscopy. A mechanism for the isomerization of the pyrazolines is suggested, supported by a deuterium exchange at C-3a.
Szoelloesy, Aron; Toth, Gabor; Lorand, Tamas, Journal of the Chemical Society. Perkin transactions II, 1991, # 4, p. 489 - 493
作者:Szoelloesy, Aron、Toth, Gabor、Lorand, Tamas、Konya, Tibor、Aradi, Ferenc、Levai, Albert