Combined XRD and DFT studies towards understanding the impact of intramolecular H-bonding on the reductive cyclization process in pyrazole derivatives
作者:Paweł Szlachcic、Tomasz Uchacz、Marlena Gryl、Andrzej Danel、Katarzyna Wojtasik、Przemysław Kolek、Bożena Jarosz、Katarzyna M. Stadnicka
DOI:10.1016/j.molstruc.2019.127087
日期:2020.1
for the reductive cyclization of the derivatives, leading to substituted 1H-pyrazolo[3,4-b]quinoxalines were discussed and explained. Our results show that one of the important factors responsible for low reactivity of the studied compounds is the existence of intramolecular hydrogen bonds. Alternative conditions for the synthesis involving microwave irradiation were proposed and tested within the study
摘要 手稿包括吡唑衍生物的分析:(5-methyl-4-nitro-2-phenyl-2H-pyrazol-3-yl)-phenyl-amines and (2H-pyrazol-3-yl)-(2-nitrophenyl )-胺分子结构,如从单晶 X 射线衍射测量和 DFT 计算中获得的。讨论并解释了衍生物还原环化的高温要求,导致取代的 1H-吡唑并 [3,4-b] 喹喔啉。我们的结果表明,导致所研究化合物反应性低的重要因素之一是分子内氢键的存在。在研究中提出并测试了涉及微波辐射的合成的替代条件。