One-Pot Acid-Promoted Synthesis of 6-Aminopyrazolopyrimidines from 1<i>H</i>-Pyrazol-5-yl-<i>N</i>,<i>N</i>-dimethylformamidines or 5-Amino-1<i>H</i>-pyrazole-4-carbaldehydes with Cyanamide
作者:Ching-Chun Tseng、Shuo-En Tsai、Sin-Min Li、Fung Fuh Wong
DOI:10.1021/acs.joc.9b02653
日期:2019.12.20
acid-promoted synthesis of 6-aminopyrazolo[3,4-d]pyrimidine has been developed by treatment of 1H-pyrazol-5-yl-N,N-dimethylformamidines or 5-amino-1H-pyrazole-4-carbaldehydes with cyanamide (NH2C≡N) in an acid-mediated solution. This syntheticroute involves four steps of deprotection, imination, the key acid-promoted heterocyclization, and aromatization. On the basis of optimized studies, methanesulfonylchloride
Evaluation of Electrophilic Heteroaromatic Substitution: Synthesis of Heteroaromatic-Fused Pyrimidine Derivatives via Sequential Three-Component Heterocyclization
作者:Fung Fuh Wong、Yu-Ying Huang、Chun-Hsi Chang
DOI:10.1021/jo301463m
日期:2012.10.5
A new sequentialthree-componentheterocyclization was developed by reacting aromatic and heterocyclic substrates, including aminobenzenes, 1-aminonaphthalene, 2-aminopyrazines, 5-aminopyrazoles, 3-aminopyridine, 5-aminopyrimidine, 5-aminoquinoline, and 8-aminoquinoline, with formamide in the presence of PBr3. The reaction gave the corresponding pyrazolo[3,4-d]pyrimidines in good yields (59–96%), except
通过使芳香族和杂环底物(包括氨基苯,1-氨基萘,2-氨基吡嗪,5-氨基吡唑,3-氨基吡啶,5-氨基嘧啶,5-氨基喹啉和8-氨基喹啉)与甲酰胺反应,开发了一种新的顺序三组分杂环化方法在PBr 3存在下。除氨基苯和3-氨基吡啶外,该反应以较高的收率(59-96%)得到了相应的吡唑并[3,4- d ]嘧啶。提出了包括三步酰胺化,亲电取代亚胺化和氧化环化的合理反应机理,以解决杂环化问题。发现反应的反应性与芳族或杂环底物的亲电子性成比例。
Vilsmeier reagent-mediated synthesis of 6-[(formyloxy)methyl]-pyrazolopyrimidines via a one-pot multiple tandem reaction
作者:Shi-Han Lu、Po-Lin Liu、Fung Fuh Wong
DOI:10.1039/c5ra07707a
日期:——
les as the starting material was developed for the efficient synthesis of 6-[(formyloxy)methyl]-1H-pyrazolo[3,4-d]pyrimidine. This new multiple tandem reaction, involving the Vilsmeier–Haack reaction, the Morgan–Walls reaction, sequential elimination, substitution, and final hydrolysis, afforded formyloxymethyl pyrazolo[3,4-d]pyrimidine products in good yields.
以5-(2-氯乙酰氨基)吡唑为起始原料,开发了一种新的Vilsmeier试剂介导的一锅反应,用于有效合成6-[((甲酰氧基)甲基] -1 H-吡唑并[3,4- d ]嘧啶。这种新的多级串联反应,包括Vilsmeier-Haack反应,Morgan-Walls反应,顺序消除,取代和最终水解,可提供高收率的甲酰氧基甲基吡唑并[3,4- d ]嘧啶产物。
Copper-Mediated C4-Benzylations of 5-Aminopyrazoles with 3-Indoleacetic Acids
Herein, we present a copper-mediated C4-benzylation of 5-aminopyrazoles with 3-indoleacetic acids. Various benzylated 5-aminopyrazoles are prepared in good-to-excellent yields under basic and ligand-free conditions in the presence of copper acetate. Moreover, this benzylation method is applicable to other substrates, including naphthylamine, 2-aminochromen-4-one, and enamines. Some products exhibit
在此,我们提出了铜介导的 5-氨基吡唑与 3-吲哚乙酸的 C4-苄基化反应。在乙酸铜存在下,在碱性和无配体条件下,各种苄化 5-氨基吡唑以良好到极好的收率制备。此外,该苄化方法适用于其他底物,包括萘胺、2-氨基色素-4-酮和烯胺。一些产品对癌细胞系表现出抗增殖活性。此外,C4-苄基化产物通过一锅两步法与醛环化为1H-吡唑并[4',3':6,7]azepino[3,4- b ]吲哚;值得注意的是,环化产物表现出具有大斯托克斯位移的荧光发射。
Synthesis and antiproliferative evaluation of N,N-disubstituted-N′-[1-aryl-1H-pyrazol-5-yl]-methnimidamides
作者:Kaung-Min Cheng、Yu-Ying Huang、Jiann-Jyh Huang、Kimiyoshi Kaneko、Masayuki Kimura、Hiroyuki Takayama、Shin-Hun Juang、Fung Fuh Wong
DOI:10.1016/j.bmcl.2010.08.133
日期:2010.11
A series of N,N-disubstituted-N'-[1-aryl-1H-pyrazol-5-yl]-methnimidamides was synthesized by a newly developed microwave reaction and their antiproliferative activities were evaluated. Microwave irradiation of 5-amino-1,3-disubstituted pyrazoles with various amide solvents in the presence of POCl(3) provided the corresponding 2a-2k, 3a-3c, and 4a-4f in good to excellent yields. The obtained methnimidamides were tested against NCI-H661, NPC-TW01, and Jurkat cancer cell lines and the results indicated that compounds 2d and 2e were the most potent with IC(50) values in low micromolar range. (C) 2010 Elsevier Ltd. All rights reserved.