Antagonists of the human CCR5 receptor as anti-HIV-1 agents.: Part 4:: Synthesis and structure-activity relationships for 1-[N(methyl)-N-(phenylsulfonyl)amino]-2-(phenyl)-4-(4-(N-(alkyl)-N- (benzyloxycarbonyl)amino)piperidin-1-yl)butanes

(2S)-2-(3-Chlorophenyl)-1-[N-(methyl)-N-(phenylsulfonyl)amino]-4-[spiro(2,3-dihydrobenzthiophene-3,4 ' -piperidin-1 ' -yl)]butane S-oxide (lb) has been identified as a potent CCR5 antagonist having an IC50 = 10 nM. Herein, structure-activity relationship studies of non-spiro piperidines are described, which led to the discovery of 4-(N-(alkyl)-N-(benzyloxy-carbonyl)amino)piperidine derivatives (3-5) as potent CCR5 antagonists. (C) 2001 Elsevier Science Ltd. All rights reserved.