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PCT No. PCT/FR96/01204 Sec. 371 Date Apr. 15, 1998 Sec. 102(e) Date Apr. 15, 1998 PCT Filed Jul. 30, 1996 PCT Pub. No. WO97/05113 PCT Pub. Date Feb. 13, 1997Compounds of formula (3) in which: R1 and R2 independently represent an atom of hydrogen, an aliphatic group or an alkyloxyalkyl group in which the alkyl chains are from C1 to C4 or together form an aromatic ring; R3 represents: an atom of hydrogen, or an NHR5 group in which R5 represents an atom of hydrogen or a COR6 group in which R6 is an aliphatic or aromatic group, or an NO2 group or a COOR7 group in which R7 is an aliphatic group, R4 represents a phenyl or heterocyclic group. These compounds can be used in the treatment of illnesses linked to the HIV virus.

4-(Arylthio)-pyridin-2(1H)-ones variously substituted in their 3-, 5-, and 6-positions have been synthesized as a new series of 1-[(2- hydroxyethoxy)methyl]-6-(phenylthio)thymine (HEPT)-pyridinone hybrid molecules. Biological studies revealed that some of them show potent HIV-1 specific reverse transcriptase inhibitory properties. Compounds 16 and 7c, the most active ones, inhibit the replication of HIV-1 at 3 and 6 nM, respectively.