Non-benzimidazole containing inhibitors of respiratory syncytial virus.

Several non-benzimidazole containing inhibitors of respiratory syncytial virus are described. Core template modification, analysis of antiviral activity, physicochemistry and optimisation of properties led to the thiazole-imidazole 13, that showed a good potency and pharmacokinetic profile in the rat.

An imidazopiperidine series of CCR5 antagonists for the treatment of HIV: the discovery of N-{(1S)-1-(3-fluorophenyl)-3-[(3-endo)-3-(5-isobutyryl-2-methyl-4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridin-1-yl)-8-azabicyclo[3.2.1]oct-8-yl]propyl}acetamide (PF-232798).

Preventing entry of HIV into human host cells has emerged as an attractive approach to controlling viral replication. Maraviroc 1 is an approved antagonist of the human CCR5 receptor which prevents the entry of HIV. Herein, we report the design and discovery of a series of imidazopiperidine CCR5 antagonists which retain the attractive antiviral profile and window over hERG activity of maraviroc 1, combined with improved absorption profiles in rat and dog.

Design and optimisation of potent gp120-CD4 inhibitors.

The synthesis and structure-activity relationship of a series of novel gp120-CD4 inhibitors are described. Pharmacokinetic studies and antiviral spectrum assessment of lead compounds led to the identification of compound 36, a potent gp120-CD4 inhibitor which exhibited antiviral potency across a spectrum of 25 clade B isolates.

Discovery of a small molecule inhibitor through interference with the gp120-CD4 interaction.

A series of piperazine derivatives were designed and synthesised as gp120-CD4 inhibitors. SAR studies led to the discovery of potent inhibitors in a cell based anti viral assay represented by compounds 9 and 28. The rat pharmacokinetic and antiviral profiles of selected compounds are also presented.

The design and discovery of novel amide CCR5 antagonists.

The synthesis of a range of novel amine-containing structures and their primary potency as inhibitors of HIV-1 fusion via blocking of the CCR5 receptor is described. The development of the medicinal chemistry strategy and SAR's which led to the identification of the piperidine amide compounds 33 and 36 as excellent leads for further evaluation is described, along with key physicochemical data which highlighted their lead potential.

Novel selective inhibitors of neutral endopeptidase for the treatment of female sexual arousal disorder.

A series of substituted glutaramides were synthesised using Candoxatrilat 1 as a lead and evaluated for potency against neutral endopeptidase (NEP) as a potential treatment for female sexual arousal disorder (FSAD). In this paper, we describe studies in which we were able to increase NEP activity substantially over the levels reported for previous compounds from this programme by appropriate substitution in both the P(1)(') and P(2)(') regions. Optimisation led to the 4-chlorophenpropylamide S-30 which was selected as a candidate for further study.

Novel selective inhibitors of neutral endopeptidase for the treatment of female sexual arousal disorder. Synthesis and activity of functionalized glutaramides.

Female sexual arousal disorder (FSAD) is a highly prevalent sexual disorder affecting up to 40% of women. We describe herein our efforts to identify a selective neutral endopeptidase (NEP) inhibitor as a potential treatment for FSAD. The rationale for this approach, together with a description of the medicinal chemistry strategy, lead compounds, and SAR investigations are detailed.

The discovery of small molecule inhibitors of neutral endopeptidase. Structure-activity studies on functionalized glutaramides.

A series of small molecule glutaramides were synthesized and evaluated for potency against canine and human neutral endopeptidase using target criteria of molecular weight <400 and log P between 2 and 4.5 to maximize the likelihood of achieving good oral absorption. The structure-activity relationship (SAR) investigations described in this paper led to the identification of an ethyl 1,3,4-thiadiazole glutaramide which demonstrated good neutral endopeptidase potency, selectivity and excellent oral absorption in the rat.