5,6-dihydro-[1,2,4]triazolo[1,5-c]quinazolines. Message 2. [5+1]-cyslocondensation of [2-(3-aryl-1H-1,2,4-triazol-5-yl)phenyl]amines with aliphatic and aromatic ketones
The reactions of [5+1]-cyclocondensation of [2-(3-aryl-1H-1,2,4-triazol-5-yl)phenyl]amines with aliphatic and aromatic ketones result in the corresponding 5-R-5-R1-2-aryl-5,6-dihydro-[1,2,4]triazolo[1,5-c]quinazolines with good yields. Modiﬁ cation of the synthetic protocol by variation of the solvent and duration of the reaction does not lead to the changes in target products yields. Conducting of the interaction between [2-(3-aryl-1H-1,2,4-triazol-5-yl)phenyl]amines and ketones in acetic acid leads to formation of the mixture the corresponding 2-aryl-5-R-5-R1-5,6-dihydro[1,2,4]triazolo[1,5-c]quinazolines and 5-methyl-2-aryl-[1,2,4]triazolo[1,5-c]quinazolin. The compounds mentioned above have been prepared using alternative synthetic approaches, namely via reﬂ uxing of [2-(3-aryl-1H-1,2,4-triazol-5-yl)phenyl]amines in acetic acid. The formation of 5-methyl-2-aryl-[1,2,4]triazolo[1,5-c]quinazolines occurs as a competitive acylation followed by the condensation process. It can be explained by the low reactivity and spatial structure of the corresponding ketones. The purity and the structure of the compounds synthesized have been proven by the complex of physicochemical methods, including IR-, LC-MS, 1H-, 13C-NMR-spectrometry and elemental analysis. It has been found that the characteristic signal of sp3-carbon atom of position 5 for the compounds synthesized is observed at the 75.57-61.64 ppm.
5-[2-(3-aryl-1H-1,2,4-triazol-5-yl)phenyl]amines; ketones; [5+1]-cyclocondensation; spectral characteristics
Kholodnyak S. V., Schabelnyk K. P., Voskoboynik O. Yu., Berest G. G., Kovalenko S. I., Zhurnal Organichnoi ta Farmatsevtichnoi Khimii – Journal of Organic and Pharmaceutical, 2015, Vol. 13, No.4(52), pp.50-56.
Knipe A. C. Reactions of Aldehydes and Ketones and their Derivatives in Organic Reaction Mechanisms. – John Wiley & Sons, Ltd, Chichester, 2011, 367 p. doi: 10.1002/9780470979525.ch1.
Barbara H. Stuart. Infrared Spectroscopy: Fundamentals and Applications / H. Barbara Stuart, Wiley, 2004, 224 p.
Gunther H. NMR Spectroscopy: Basic Principles, Concepts and Applications in Chemistry, 3-rd Edition., Wiley, 2013, 734 p.
Kovalenko S. I., Voloshina V. O., Karpenko O. V., Zhurnal Organichnoi ta Farmatsevtichnoi Khimii – Journal of Organic and Pharmaceutical, 2010, Vol. 8(2(80)), pp.48-56.
Kholodnyak S. V., Schabelnyk К. P., Chernova G. О., Коvalenko S. І., Trshetsinskij S. D., Sergeieva T. Yu., Okovytyy S. I., Shishkina S. V. News of Pharmacy, 2015, No.3(83). – pp.9-17.
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Abbreviated key title: Ž. org. farm. hìm.
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