Synthesis of 8,9-dihydrodipyrazolo[3,4-b:4′,3′-f][1,5]diazocin-10(1H)-one. A new ring system |
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Authors: | Onofrio Migliara Liliana Lamartina Marina Timoneri Salvatore Plescia |
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Abstract: | 8,9-Dihydrodipyrazolo3,4-b:4′,3′-f]1,5]diazocin-10(1H)-ones 7 were prepared by cyclization of 1-ethyl-N,3-dimethyl-4-acetamido-N-(1-R1-3-R2-1H-pyrazol-5-yl)-1H-pyrazole-5-carboxamides 6 by a Bischler-Napieralski cyclization. A complete assignment of the chemical shifts to the carbon atoms of compound 7 was performed by different nmr experiments, such as DEPT and XHDEPT for one? bond C? H correlations and COLOC experiments for long-range C-H correlations. |
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