Convenient Ultrasound-Promoted Regioselective Synthesis of Fused 6-Amino-3-methyl-4-aryl-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile
摘要:
[image omitted] A multicomponent, catalyst-free reaction for the synthesis of fused 6-amino-3-methyl-4-aryl-1H-pyrazolo [3,4-b] pyridine-5-carbonitrile from 3-amino-5-methylpyrazole, malononitrile, and substituted aldehydes under ultrasound irradiation in short reaction times (8-10min) with good yields (85-98%) is reported.
Catalyst-free grinding method: a new avenue for synthesis of 6-amino-3-methyl-4-aryl-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile and DFT studies on the mechanistic pathway of this category of compounds
A novel, efficient, one-pot, catalyst-free grinding procedure for synthesis of 6-amino-3-methyl-4-aryl-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile is reported. The condensation of substituted benzaldehydes, 3-amino-5-methylpyrazole, and malononitrile according to a three-component reaction was investigated using density functional theory (DFT) at B3LYP/6-311G level to explore the reaction mechanism.
报道了一种新颖,高效,一锅无催化剂的研磨程序,用于合成6-氨基-3-甲基-4-芳基-1 H-吡唑并[3,4- b ]吡啶-5-甲腈。利用密度泛函理论(DFT)在B3LYP / 6-311G水平上研究了取代的苯甲醛,3-氨基-5-甲基吡唑和丙二腈根据三组分反应的缩合反应,探讨了其反应机理。研究了所有路线,优化了中间体的结构,并找到了所有的过渡态。计算结果表明,所提出的机制依赖于四个中间体。
Synthesis and antitumor evaluation of some new thiazolopyridine, nicotinonitrile, pyrazolopyridine, and polyhydroquinoline derivatives using ceric ammonium nitrate as a green catalyst
作者:Reham R. Raslan、Sadia A. Hessein、Sawsan A. Fouad、Nadia A. M. Shmiess
DOI:10.1002/jhet.4423
日期:2022.5
A novel series of thiazolo[5,4-b]pyridine, polysubstituted pyridines, pyrazolo [3,4-b] pyridine-5-carbonitriles, and polyhydroquinoline were synthesized via one-pot reaction of 2-iminothiazolidin-5-one, acetyl pyridine, pyrazolone, and/or cyclohexanone with various aldehydes, some active methylene and ammonium acetate in the presence of ceric ammonium nitrate (CAN). The resulting compounds were generated
通过 2-亚氨基噻唑烷-5-酮、乙酰基的一锅反应合成了一系列新型噻唑并[5,4 - b ]吡啶、多取代吡啶、吡唑并[3,4- b ]吡啶-5-甲腈和聚氢喹啉在硝酸铈铵 (CAN) 存在下,吡啶、吡唑啉酮和/或环己酮与各种醛、一些活性亚甲基和乙酸铵。所得化合物在短时间内以高产率生成,并使用 IR、1 H NMR、13 C-NMR 和质谱确认了新化合物的结构。体外测试了 15 种物质对 HePG-2 和 Caco-2 细胞系的细胞毒活性。抗肿瘤试验结果证实喹啉12d化合物对两种接近于多柔比星的细胞系具有更高的细胞毒活性,多柔比星被用作标准抗癌药物。此外,12c化合物对 2 细胞系具有更有效的抗肿瘤作用。而化合物1对 Caco-2 表现出中等活性。另一方面,大多数测试化合物对这两种细胞系表现出中度至低度的细胞毒活性。根据结果,一些新合成的衍生物显示出优异的抗肿瘤活性,使其可用于生物医学应用。
Aluminum hydrogen sulfate as a green catalyst for the solvent-free synthesis of pyrazolopyridines
作者:M. Nikpassand、L. Zare Fekri
DOI:10.1134/s1070363215050308
日期:2015.5
Aluminum hydrogen sulfate turned out to be a mild, convenient, and efficient reagent for the conversion of substituted benzyl alcohols into pyrazolopyridines via condensation with 3-methyl-1H-pyrazole-5-amine and CH acid (malononitrile or indan-1,3-dione) at room temperature under solvent-free conditions with high yield, high purity, and short reaction time.