Dl. Romero et al., DISCOVERY, SYNTHESIS, AND BIOACTIVITY OF BIS(HETEROARYL)PIPERAZINES .1. A NOVEL CLASS OF NONNUCLEOSIDE HIV-1 REVERSE-TRANSCRIPTASE INHIBITORS, Journal of medicinal chemistry, 37(7), 1994, pp. 999-1014
A variety of analogues of thylbenzyl]-4-[3-(ethylamino)-2-pyridyl]pipe
razine hydrochloride (U-80493E) were synthesized and evaluated for the
ir inhibition of human immunodeficiency virus type 1 (HIV-1) reverse t
ranscriptase (RT). Replacement of the substituted aryl moiety with var
ious substituted indoles provided bis(heteroaryl)piperazines (BHAPs) t
hat were 10-100-fold more potent than U-80493E. The pyridyl portion of
the lead molecule was found to be very sensitive to modifications. Ex
tensive preclinical evaluations of several of these compounds led to t
he selection of l)carbonyl]-4-[3-(ethylamino)-2-pyridyl]piperazine met
hanesulfonate (U-87201E, atevirdine mesylate) for clinical evaluation.