Structure activity relationship studies of 3-arylsulfonyl-pyrido[1,2-a]pyrimidin-4-imines as potent 5-HT6 antagonists
作者:Shuanghua Hu、Yazhong Huang、Yong-Jin Wu、Huan He、Katherine A. Grant-Young、Robert L. Bertekap、Valerie Whiterock、Patrick Brassil、Kimberley Lentz、Prasanna Sivaprakasam、David R. Langley、Ryan S. Westphal、Paul M. Scola
DOI:10.1016/j.bmc.2014.01.003
日期:2014.3
Comprehensive structure activity relationship (SAR) studies were conducted on a focused screening hit, 2-(methylthio)-3-(phenylsulfonyl)-4H-pyrido[1,2-a]pyrimidin-4-imine (1, IC50: 4.0 nM), as 5-HT6 selective antagonists. Activity was improved some 2-4 fold when small, electron-donating groups were added to the central core as observed in 19, 20 and 26. Molecular docking of key compounds in a homology model of the human 5-HT6 receptor was used to rationalize our structure-activity relationship (SAR) findings. In pharmacokinetic experiments, compound 1 displayed good brain uptake in rats following intra-peritoneal administration, but limited oral bioavailability. (C) 2014 Elsevier Ltd. All rights reserved.