Abstract: The invention is concerned with novel imidazolone derivatives, a process for their manufacture, pharmaceutical compositions and the use of such compounds in medicine. In particular, the compounds are inhibitors of the human immunodeficiency virus reverse transcriptase enzyme which is involved in viral replication. Consequently the compounds of this invention may be advantageously used as therapeutic agents against HIV infection.

Abstract: Disclosed are novel pyrrole derivatives, a process for their manufacture, pharmaceutical compositions containing such compounds and the use of such compounds in the treatment of HIV mediated diseases.

Abstract: The present invention provides antiviral compounds of Formula (I), and pharmaceutically acceptable salts thereof: ##STR1## wherein X is --CH.sub.2 O or --CH.sub.2 ;R.sub.1 is hydroxy or amino;R.sub.2 is hydrogen or amino;R.sub.3 is hydrogen, hydroxymethyl or acyloxymethyl, wherein the acyl group of said acyloxymethyl is selected from the group consisting of C.sub.1-7 alkanoyl and benzoyl optionally substituted in the phenyl ring by one, two or three substituents selected from the group consisting of fluoro, chloro, bromo, C.sub.1-4 alkyl and C.sub.1-4 alkoxy, wherein the alkyl moiety of said C.sub.1-4 alkyl and C.sub.1-4 alkoxy substituents is selected from the group consisting of methyl, ethyl, n- and iso-propyl, n-, sec-, iso- and tert-butyl,R.sub.4 is a group of formula: ##STR2## wherein R.sub.5 and R.sub.6 are independent selected from hydrogen, C.sub.1-6 alkyl and phenyl optionally substituted by one, two or three substituents selected from the group consisting of fluoro, chloro, bromo, C.sub.

Abstract: A process for preparing pharmaceutically active compounds of formula (A): ##STR1## wherein X is hydrogen, hydroxy, chloro, C.sub.1-6 alkoxy or phenyl C.sub.1-6 alkoxy; and R.sub.a and R.sub.b are hydrogen, or acyl or phosphate derivatives thereof, which process comprises the preparation of an intermediate of formula (I): ##STR2## wherein R.sub.1 is C.sub.1-6 alkyl, or phenyl C.sub.1-6 alkyl in which the phenyl group is optionally substituted; R.sub.2 is hydrogen, hydroxy, chlorine, C.sub.1-6 alkoxy, phenyl C.sub.1-6 alkoxy or amino; and R.sub.3 is halogen, C.sub.1-6 alkylthio, C.sub.1-6 alkylsulphonyl, azido, an amino group or a protected amino group, via the reaction of a compound of formula (II): ##STR3## wherein R.sub.2 and R.sub.3 are as defined for formula (I) with: (a) a compound of formula (III): ##STR4## wherein R.sub.4 and R.sub.5 are independently hydrogen, C.sub.1-6 alkyl, or phenyl, or R.sub.4 and R.sub.5 together are C.sub.