Structure-guided design and synthesis of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mtext>P</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:none /><mml:none /><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> position 1-phenylcycloalkylamine-derived pentapeptidic BACE1 inhibitors
作者:Harichandra D. Tagad、Yoshio Hamada、Jeffrey-Tri Nguyen、Koushi Hidaka、Takashi Hamada、Youhei Sohma、Tooru Kimura、Yoshiaki Kiso
DOI:10.1016/j.bmc.2011.07.002
日期:2011.9
Previously, we reported potent pentapeptidic BACE1 inhibitors with the hydroxymethylcarbonyl isostere as a substrate transition-state mimic. To improve the in vitro potency, we further reported pentapeptidic inhibitors with carboxylic acid bioisosteres at the P-4 and P-1' positions. In the current study, we screened new P-1' position 1-phenylcycloalkylamine analogs to find non-acidic inhibitors that possess double-digit nanomolar range IC50 values. An extensive structure-activity relationship study was performed with various amine derivatives at the P-1' position. The most potent inhibitor of this pentapeptide series, KMI-1830, possessing 1-phenylcyclopentylamine at the P-1' position had an IC50 value of 11.6 nM against BACE1 in vitro enzymatic assay. (C) 2011 Elsevier Ltd. All rights reserved.