Novel 1,5-Diphenylpyrazole Nonnucleoside HIV-1 Reverse Transcriptase Inhibitors with Enhanced Activity versus the Delavirdine-Resistant P236L Mutant: Lead Identification and SAR of 3- and 4-Substituted Derivatives
摘要:
Through computationally directed broad screening, a novel 1,5-diphenylpyrazole (DPP) class of HIV-1 nonnucleoside reverse transcriptase inhibitors (NNRTIs) has been discovered. Compound 2 (PNU-32945) was found to have good activity versus wild-type (IC50 = 2.3 mu M) and delavirdine-resistant P236L (IC50 = 1.1 mu M) reverse transcriptase IRT). Also, PNU-32945 has an ED50 for inhibition of viral replication in cell cultures of 0.1 mu M and was shown to be noncytotoxic with a CC50 > 10 mu M. Structure-activity relationship studies on the 3- and 4-positions of PNU-32945 led to interesting selectivity and activity within the class. In particular, the 3-hydroxyethyl-4-ethyl congener 29 is a potent inhibitor of the P236L mutant (IC50 = 0.65 mu M), whereas it is essentially inactive versus the wild-type enzyme (IC50 > 50 mu M). Furthermore, this compound was significantly more active versus the P236L mutant than delavirdine. The synthesis and RT inhibitory activity of various 3- and 4-substituted analogues are discussed.
Molecular modeling and synthesis of new 1,5-diphenylpyrazoles as breast cancer cell growth inhibitors
作者:Wafaa A. Ewes、Sahar M.I. Badr、Hassan M. Eisa、Magda N.A. Nasr
DOI:10.1515/hc-2015-0156
日期:2015.12.1
Abstract New pyrazoles have been synthesized and evaluated as breast cancer cell growth inhibitors. Condensation of the substituted pyrazole-4-carbaldehyde 1 with acetophenone and chloroacetophenone afforded α, β-unsaturated ketones 2 and 3, respectively. Compounds 2 and 3 were subjected to different reactions using hydrazine hydrate, substitutedhydrazine hydrate, hydroxylamine, o-phenylenediamine
Synthesis of dibenzopyranones and pyrazolobenzopyranones through copper(0)/Selectfluor system-catalyzed double CH activation/oxygen insertion of 2-arylbenzaldehydes and 5-arylpyrazole-4-carbaldehydes
作者:Jian Zhang、Dongdong Shi、Haifeng Zhang、Zheng Xu、Hanyang Bao、Hongwei Jin、Yunkui Liu
DOI:10.1016/j.tet.2016.11.069
日期:2017.1
A mild and efficient protocol for the synthesis of dibenzopyranones and pyrazolobenzopyranones was developed involving a copper(0)/Selectfluor system-catalyzed double C-H activation/oxygen insertion of 2-arylbenzaldehydes and 5-arylpyrazole-4-carbaldehydes. Preliminary mechanistic studies suggest that both water and dioxygen act as the oxygen source in the formation of pyranone scaffolds. (C) 2016 Elsevier Ltd. All rights reserved.