Synthesis and structure-activity relationship for new series of 4-phenoxyquinoline derivatives as specific inhibitors of platelet-derived growth factor receptor tyrosine kinase.
We discovered a new series of 4-phenoxyquinoline derivatives as potent and selective inhibitors of the platelet-derived growth factor receptor (PDGFr) tyrosine kinase. We researched the highly potent and selective inhibitors on the basis of both PDGFr and epidermal growth factor receptor (EGFr) inhibitory activity. First, we found a compound, Ki6783 (1), which inhibited PDGFr autophosphorylation at 0.13 microM, but it did not inhibit EGFr autophosphorylation at 100 microM. After extensive explorations, we found the two desired compounds, Ki6896 (2) and Ki6945 (3), which are substituted by benzoyl and benzamide at the 4-position of the phenoxy group on 4-phenoxyquinoline, respectively. These inhibitory activities were 0.31 and 0.050 microM, respectively, but neither of them inhibited EGFr autophosphorylation at 100 microM. We further investigated the profile of both compounds toward various tyrosine and serine/threonine kinases. The three compounds specifically inhibited PDGFr rather than the other kinases.
Kubo
Kazuo
K
Pharmaceutical Research Laboratories, Kirin Brewery Co., Ltd., 3Miyahara-cho, Takasaki-shi, Gunma, 370-1295, Japan. ka-kubo@kirin.co.jp
Ohyama
Shin-ichi
S
Shimizu
Toshiyuki
T
Takami
Atsuya
A
Murooka
Hideko
H
Nishitoba
Tsuyoshi
T
Kato
Shinichiro
S
Yagi
Mikio
M
Kobayashi
Yoshiko
Y
Iinuma
Noriko
N
Isoe
Toshiyuki
T
Nakamura
Kazuhide
K
Iijima
Hiroshi
H
Osawa
Tatsushi
T
Izawa
Toshio
T
D000818:Animals; D004791:Enzyme Inhibitors / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D041681:NIH 3T3 Cells; D011804:Quinolines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D017479:Receptors, Platelet-Derived Growth Factor / Q000037:antagonists & inhibitors*; D021241:Spectrometry, Mass, Electrospray Ionization; D013329:Structure-Activity Relationship
D004791:Enzyme Inhibitors; D011804:Quinolines; C099852:PDGF receptor tyrosine kinase; D017479:Receptors, Platelet-Derived Growth Factor