Ring–Chain Tautomerism of Simplified Analogues of Isoniazid–NAD(P) Adducts: an Experimental and Theoretical Study
作者:Tamara Delaine、Vania Bernardes-Génisson、Jean-Luc Stigliani、Heinz Gornitzka、Bernard Meunier、Jean Bernadou
DOI:10.1002/ejoc.200600974
日期:2007.4
chain form, whereas the pyridine analogue (Ar = Py), which is the closest model of the isoniazid–NAD(P) adduct, exists as ring (major) and chain (minor) tautomers in equilibrium. The ratio of the tautomeric forms involved in the equilibrium of this system is also influenced by the polarity of the solvent with a shift towards the ring tautomer when the polarity of the solvent is increased. Complementary
制备了氧化和还原异烟肼-NAD(P) 加合物的简化类似物,以研究它们在溶液中的环链互变异构现象的行为。在 DMSO 中,发现氧化类似物(吡啶盐)和相应的 1,2-二氢吡啶还原化合物仅以环(环状半酰胺)形式存在。相反,取决于芳族取代基的性质,1,4-二氢吡啶还原的类似物以环和/或链形式存在。1,4-二氢吡啶(Ar = Ph, 3Cl-Py)在溶液中优先以酮-酰胺链形式存在,而吡啶类似物(Ar = Py)是异烟肼-NAD( P) 加合物,以平衡的环(主要)和链(次要)互变异构体形式存在。参与该系统平衡的互变异构形式的比例也受溶剂极性的影响,当溶剂极性增加时,会向环状互变异构体移动。通过使用量子化学计算 (B3LYP/6-31G**) 和前沿分子轨道分析进行了补充计算研究,这使得可以讨论环链互变异构平衡中涉及的关键结构因素。(© Wiley-VCH Verlag GmbH & Co. KGaA,