A series of novel 1, 4-disubstituted piperidine/piperazine derivatives were designed, synthesized and evaluated for their in vitro activities against HIV-1 Bal (R5) infection in CEMX174 5.25 M7 cells. A majority of these compounds showed potent anti-HIV-1 activities with IC50 at nanomolar levels. N-(4-Fluoro-benzyl) piperazine analog B07 hydrochloride exhibited potency against HIV-1 activity similar to that of TAK-220 hydrochloride, but it had ...