Discovery of 3-aryl-3-methyl-1H-quinoline-2,4-diones as a new class of selective 5-HT6 receptor antagonists.
A 5,7-dichloro-3-phenyl-3-methyl-quinoline-2,4-dione (11a) has been identified in a random screen as a lead for 5-HT(6) antagonist. During the lead optimization process, several analogs were synthesized and their biological activities were investigated. Within this series, several compounds display high binding affinity and selectivity for the 5-HT(6) receptor. In particular, 3-(4-hydroxyphenyl)-3-methyl-quinoline-2,4-dione (12f) exhibits high affinity (K(i)=12.3 nM) for 5-HT(6) receptor with good selectivity over other serotonin and dopamine (D(1)-D(4)) receptor subtypes. In a functional adenylyl cyclase stimulation assay, this compound exhibited considerable antagonistic activity (IC(50)=0.61 microM).
Seong
Churl Min
CM
Center for Medicinal Chemistry, Drug Discovery Division, Korea Research Institute of Chemical Technology, 100 Chang-dong, Yuseong-gu, Daejeon 305-606, South Korea. cmsung@krict.re.kr
Park
Woo Kyu
WK
Park
Chul Min
CM
Kong
Jae Yang
JY
Park
No Sang
NS
D002460:Cell Line; D006801:Humans; D011804:Quinolines / Q000737:chemistry / Q000494:pharmacology*; D011869:Radioligand Assay; D011985:Receptors, Serotonin / Q000187:drug effects* / Q000378:metabolism; D012702:Serotonin Antagonists / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*
D011804:Quinolines; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; C097216:serotonin 6 receptor