中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 4-chloro-1-phenyl-1H-pyrazol-3-ol | 7409-32-7 | C9H7ClN2O | 194.62 |
4-氨基-1-苯基-1,2-二氢吡唑-3-酮 | 1-Phenyl-4-amino-3-hydroxy-pyrazol | 7409-23-6 | C9H9N3O | 175.19 |
—— | 4-Brom-3-hydroxy-1-phenyl-pyrazol | 7409-31-6 | C9H7BrN2O | 239.071 |
—— | 4-iodo-1-phenyl-1H-pyrazol-3-ol | 1190837-95-6 | C9H7IN2O | 286.072 |
—— | 4-bromo-1-(4-bromophenyl)-1H-pyrazole-3-ol | 543694-92-4 | C9H6Br2N2O | 317.967 |
—— | 3-hydroxy-1-phenyl-1H-pyrazole-4-carbaldehyde | —— | C10H8N2O2 | 188.186 |
—— | 3-ethoxy-1-phenyl-1H-pyrazole | 1207432-03-8 | C11H12N2O | 188.229 |
A library of 2,4,6,7-tetrasubstituted-2H-pyrazolo[4,3-c]pyridines was prepared from easily accessible 1-phenyl-3-(2-phenylethynyl)-1H-pyrazole-4-carbaldehyde via an iodine-mediated electrophilic cyclization of intermediate 4-(azidomethyl)-1-phenyl-3-(phenylethynyl)-1H-pyrazoles to 7-iodo-2,6-diphenyl-2H-pyrazolo[4,3-c]pyridines followed by Suzuki cross-couplings with various boronic acids and alkylation reactions. The compounds were evaluated for their antiproliferative activity against K562, MV4-11, and MCF-7 cancer cell lines. The most potent compounds displayed low micromolar GI50 values. 4-(2,6-Diphenyl-2H-pyrazolo[4,3-c]pyridin-7-yl)phenol proved to be the most active, induced poly(ADP-ribose) polymerase 1 (PARP-1) cleavage, activated the initiator enzyme of apoptotic cascade caspase 9, induced a fragmentation of microtubule-associated protein 1-light chain 3 (LC3), and reduced the expression levels of proliferating cell nuclear antigen (PCNA). The obtained results suggest a complex action of 4-(2,6-diphenyl-2H-pyrazolo[4,3-c]pyridin-7-yl)phenol that combines antiproliferative effects with the induction of cell death. Moreover, investigations of the fluorescence properties of the final compounds revealed 7-(4-methoxyphenyl)-2,6-diphenyl-2H-pyrazolo[4,3-c]pyridine as the most potent pH indicator that enables both fluorescence intensity-based and ratiometric pH sensing.