ABSTRACT
Following the discovery of 4-(substituted amino)-1-alkyl-pyrazolo[3,4-b]pyridine-5-carboxamides as potent and selective phosphodiesterase 4B inhibitors, [Hamblin, J. N.; Angell, T.; Ballentine, S., et al. Bioorg. Med. Chem. Lett.2008, 18, 4237] the SAR of the 5-position was investigated further. A range of substituted heterocycles showed good potencies against PDE4. Optimisation using X-ray crystallography and computational modelling led to the discovery of 16, with sub-nM inhibition of LPS-induced TNF-α production from isolated human peripheral blood mononuclear cells.
Subject(s)
Cyclic Nucleotide Phosphodiesterases, Type 4/chemistry , Heterocyclic Compounds/chemistry , Phosphodiesterase Inhibitors/chemistry , Pyrazoles/chemistry , Pyridines/chemistry , Binding Sites , Computer Simulation , Crystallography, X-Ray , Cyclic Nucleotide Phosphodiesterases, Type 4/metabolism , Humans , Models, Chemical , Models, Molecular , Phosphodiesterase Inhibitors/chemical synthesis , Phosphodiesterase Inhibitors/pharmacology , Protein Structure, Tertiary , Pyrazoles/chemical synthesis , Pyrazoles/pharmacology , Pyridines/chemical synthesis , Pyridines/pharmacology , Structure-Activity Relationship , Tumor Necrosis Factor-alpha/metabolismABSTRACT
The carbamate (-O2CNR2) function is an excellent directing group for palladium-catalysed direct arylation reactions giving both protected or free mono- or di-substituted phenols, as well as an example of a dibenzopyranone, depending on coupling partners (aryl iodides or diaryliodonium salts) and conditions.
Subject(s)
Carbamates/chemistry , Palladium/chemistry , Phenols/chemical synthesis , Catalysis , Molecular Structure , Phenols/chemistryABSTRACT
Optimisation of a high-throughput screening hit resulted in the discovery of 4-(substituted amino)-1-alkyl-pyrazolo[3,4-b]pyridine-5-carboxamides as potent and selective inhibitors of Phosphodiesterase 4 (PDE4). Herein, we describe early SAR studies around this novel template highlighting preferred substituents and rationalization of SAR through X-ray crystal structures of analogues bound to the PDE4 active site. Pyrazolopyridine 20a was found to be a potent and selective PDE4 inhibitor which also inhibits LPS induced TNF-alpha production from isolated human peripheral blood mononuclear cells and has an encouraging rat PK profile suitable for oral dosing.
Subject(s)
Chemistry, Pharmaceutical/methods , Cyclic Nucleotide Phosphodiesterases, Type 4/chemistry , Phosphodiesterase 4 Inhibitors , Pyrazoles/chemical synthesis , Pyrazoles/pharmacokinetics , Pyridines/chemical synthesis , Pyridines/pharmacokinetics , Aminopyridines/pharmacology , Animals , Benzamides/pharmacology , Crystallography, X-Ray/methods , Cyclopropanes/pharmacology , Drug Design , Humans , Leukocytes, Mononuclear/cytology , Leukocytes, Mononuclear/metabolism , Models, Biological , Models, Chemical , Pyrrolidinones/chemistry , Rats , Rolipram/pharmacology , Tumor Necrosis Factor-alpha/metabolismABSTRACT
OBJECTIVE: To evaluate an online disease management system supporting patients with uncontrolled type 2 diabetes. MATERIALS AND METHODS: Engaging and Motivating Patients Online With Enhanced Resources for Diabetes was a 12-month parallel randomized controlled trial of 415 patients with type 2 diabetes with baseline glycosylated hemoglobin (A1C) values ≥7.5% from primary care sites sharing an electronic health record. The intervention included: (1) wirelessly uploaded home glucometer readings with graphical feedback; (2) comprehensive patient-specific diabetes summary status report; (3) nutrition and exercise logs; (4) insulin record; (5) online messaging with the patient's health team; (6) nurse care manager and dietitian providing advice and medication management; and (7) personalized text and video educational 'nuggets' dispensed electronically by the care team. A1C was the primary outcome variable. RESULTS: Compared with usual care (UC, n=189), patients in the intervention (INT, n=193) group had significantly reduced A1C at 6 months (-1.32% INT vs -0.66% UC; p<0.001). At 12 months, the differences were not significant (-1.14% INT vs -0.95% UC; p=0.133). In post hoc analysis, significantly more INT patients had improved diabetes control (>0.5% reduction in A1C) than UC patients at 12 months (69.9 (95% CI 63.2 to 76.5) vs 55.4 (95% CI 48.4 to 62.5); p=0.006). CONCLUSIONS: A nurse-led, multidisciplinary health team can manage a population of diabetic patients in an online disease management program. INT patients achieved greater decreases in A1C at 6 months than UC patients, but the differences were not sustained at 12 months. More INT than UC patients achieved improvement in A1C (>0.5% decrease). Trial registered in clinical trials.gov: #NCT00542204.
Subject(s)
Diabetes Mellitus, Type 2/therapy , Self Care , Telemedicine , Adult , Aged , Aged, 80 and over , Diabetes Mellitus, Type 2/nursing , Disease Management , Female , Glycated Hemoglobin/analysis , Health Behavior , Humans , Internet , Male , Middle Aged , Patient Care Team , Young AdultABSTRACT
Solvent-free reaction conditions facilitate a range of aromatic C-H functionalisations that traditionally require acidic or disfavoured solvents. These reactions include selective ortho- and meta-arylation of aryl carbamates and anilides and selective halogenation reactions.
Subject(s)
Anilides/chemistry , Carbamates/chemistry , Hydrocarbons, Aromatic/chemistry , Catalysis , Halogenation , Molecular StructureABSTRACT
The solvent-free, palladium-catalysed reaction of anilides with CuCl(2) in the presence or absence of copper acetate yields ortho-chlorinated anilides in good to excellent yields, even on a large scale (100 mmol). By contrast, the equivalent reactions with copper bromide, either solvent free or in 1,2-dichloroethane, in the presence or absence of palladium, under air or inert conditions, gave the products of simple electrophilic bromination. Mechanistic studies highlighted the involvement of palladacyclic intermediates, one of which was characterised crystallographically, which undergo subsequent reaction with copper(II) chloride to yield the chlorinated anilide products.