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
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.