1H and 13C NMR Study of 1-Hydrazino-2,3-dihydro-1H-pyrazolo[1,2-a]pyridazine-5,8-diones and -1H-pyrazolo[1,2-b]phthalazine-5,10-diones and Their Ring-Chain Tautomerism
作者:Jari Sinkkonen、Vladimir Ovcharenko、Kirill N. Zelenin、Irina P. Bezhan、Boris A. Chakchir、Fatema Al-Assar、Kalevi Pihlaja
DOI:10.1002/1099-0690(200207)2002:13<2046::aid-ejoc2046>3.0.co;2-c
日期:2002.7
corresponding acylhydrazino derivatives. In this work, ten new hydrazino derivatives were synthesized, and their properties were studied by 1H and 13C NMR spectroscopy. These compounds exhibited several types of structural variation, including ring-chain tautomerism, cis-trans isomerism with respect to the substituents in the pyrazole ring, and (E)/(Z) rotamerism with respect to the nitrogen−carbon hydrazide
用酰肼处理 1-羟基-2,3-二氢-1H-吡唑并[1,2-a]哒嗪-5,8-二酮和-1H-吡唑并[1,2-b]酞嗪-5,10-二酮产生相应的酰基肼衍生物。在这项工作中,合成了十种新的肼基衍生物,并通过 1H 和 13C NMR 光谱研究了它们的性质。这些化合物表现出几种类型的结构变化,包括环链互变异构、吡唑环中的取代基的顺反异构和(E)/(Z)旋转异构与氮-碳酰肼键的部分双- 债券字符。在 [D6]DMSO 中,2,3-二氢-1H-吡唑并[1,2-a]哒嗪-5,8-二酮衍生物主要以线性互变异构体的形式存在,而 2,3-二氢-1H-吡唑并[1, 2-b] phthalazine-5,10-dione 衍生物有利于环状互变异构体。对于后面的化合物,发现了六组分平衡,由线性和顺式和反式环状互变异构体组成,所有这些互变异构体都有两个旋转异构体,(E)和(Z)。(© Wiley-VCH Verlag