<i>N</i><sup>G</sup>-Acylated Imidazolylpropylguanidines as Potent Histamine H<sub>4</sub> Receptor Agonists: Selectivity by Variation of the <i>N</i><sup>G</sup>-Substituent
3-(1H-Imidazol-4-yl)propylguanidine (SK&F 91486, 4) was identified as a potent partial agonist at the human histamine H-3 receptor (hH(3)R) and human histamine H-4 receptor (hH(4)R). With the aim to increase selectivity for the hH4R, the guanidine group in 4 was acylated. N-1-Acetyl-N-2-[3-(1H-imidazol-4-yl)propyl]guanidine (UR-PI288, 13) was a potent full agonist at the hH(4)R (pEC(50) = 8.31; alpha = 1.00), possessing more than 1000- and 100-fold selectivity relative to the hH(1)R and hH(2)R, respectively, and possessing only low intrinsic activity (alpha = 0.27) at the hH(3)R.
Synthesis of indolo/pyrroloazepinone-oxindoles as potential cytotoxic, DNA-intercalating and Topo I inhibitors
作者:Manasa Kadagathur、Arbaz Sujat Shaikh、Biswajit Panda、Joel George、Regur Phanindranath、Dilep Kumar Sigalapalli、Nagesh A. Bhale、Chandraiah Godugu、Narayana Nagesh、Nagula Shankaraiah、Neelima D. Tangellamudi
DOI:10.1016/j.bioorg.2022.105706
日期:2022.5
conjugates was synthesized and evaluated for their antiproliferative activityagainst a panel of selected human cancer cell lines including A549 (lung cancer), HCT116 (colon cancer), MCF7 (breast cancer), and SK-MEL-28 (melanoma). Among the synthesized molecules (14a-m and 15a-d), compound 14d displayed remarkable activityagainst A549, HCT116 and SK-MEL-28 cells with IC50 values < 4 μM with the best