NZ753453B2 - Combinations comprising positive allosteric modulators or orthosteric agonists of metabotropic glutamatergic receptor subtype 2 and their use - Google Patents

Abstract

The present invention relates to combinations comprising a positive allosteric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 ("mGluR2") or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric agonist of metabotropic glutamatergic receptor subtype 2 compound or a pharmaceutically acceptable salt or a solvate thereof, and a synaptic vesicle protein 2A ("SV2A") ligand. Specifically, combinations of the SV2A ligands levetiracetam, brivaracetam, or selectracetam are combined with the compound 6b. or a pharmaceutically acceptable salt or a solvate thereof, and a synaptic vesicle protein 2A ("SV2A") ligand. Specifically, combinations of the SV2A ligands levetiracetam, brivaracetam, or selectracetam are combined with the compound 6b.

Description

COMBINATIONS COMPRISING POSITIVE ERIC MODULATORS OR ORTHOSTERIC AGONISTS OF TROPIC ATERGIC RECEPTOR SUBTYPE 2 AND THEIR USE FIELD OF THE INVENTION The present invention relates to combinations comprising a positive allosteric modulator ("PAM") of metabotropic glutamatergic receptor e 2 ("mGluR2") or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric agonist of metabotropic atergic receptor subtype 2 compound or a ceutically acceptable salt or a solvate thereof, and a synaptic vesicle protein 2A ") ligand.

BACKGROUND OF THE INVENTION Epilepsy describes a condition in which a person has recurrent seizures due to a chronic, underlying process. Epilepsy refers to a clinical phenomenon rather than a single disease entity, since there are many forms and causes of epilepsy. Using a definition of epilepsy as two or more oked es, the incidence of epilepsy is estimated at approximately 0.3 to 0.5 percent in different populations throughout the world, with the prevalence of epilepsy estimated at 5 to 10 people per 1000.

An essential step in the evaluation and management of a patient with a seizure is to determine the type of seizure that has occurred. The main characteristic that distinguishes the different categories of es is whether the seizure activity is partial (synonymous with focal) or generalized.

Partial seizures are those in which the e activity is restricted to discrete areas of the al cortex. If consciousness is fully preserved during the seizure, the clinical manifestations are considered relatively simple and the seizure is termed a - partial seizure. If consciousness is impaired, the seizure is termed a complex-partial seizure. An important additional subgroup comprises those seizures that begin as partial seizures and then spread diffusely hout the cortex, which are known as partial seizures with secondary lization.

Generalized seizures involve diffiJse regions of the brain simultaneously in a rally symmetric fashion. Absence or petit mal seizures are characterized by sudden, brief lapses of consciousness without loss of postural control. Atypical absence seizures typically include a longer duration in the lapse of consciousness, less abrupt onset and cessation, and more obvious motor signs that may include focal or lateralizing features.

Generalized tonic-clonic or grand mal es, the main type of generalized seizures, are characterized by abrupt onset, without warning. The initial phase of the seizure is usually tonic contraction of muscles, impaired respiration, a marked enhancement of sympathetic tone leading to increased heart rate, blood pressure, and pupillary size.

After 10-20 s, the tonic phase of the seizure typically evolves into the clonic phase, produced by the superimposition ofperiods of muscle relaxation on the tonic muscle ction. The periods of relaxation progressively increase until the end of the ictal phase, which usually lasts no more than 1 min. The postictal phase is characterized by unresponsiveness, muscular flaccidity, and ive salivation that can cause stridorous breathing and partial airway ction. Atonic seizures are characterized by sudden loss ofpostural muscle tone lasting 1-2 s. Consciousness is briefly ed, but there is usually no postictal confusion. Myoclonic seizures are characterized by a sudden and brief muscle contraction that may involve one part of the body or the entire body.

The synaptic vesicle protein 2A ") has been identified as a broad um anticonvulsant target in models of partial and lized epilepsy. Studies performed in animal models and human tissue suggest that changes in the expression of SV2A are implicated in epilepsy (for a review see for instance: (a) Mendoza—Torreblanca et al.

"Synaptic vesicle protein 2A: basic facts and role in synaptic fianction" European l ofNeuroscience 2013, pp. 1-11; (b) Kaminski RM, et al. "Targeting SV2A for Discovery ofAntiepileptic Drugs". In: Noebels JL, Avoli M, Rogawski MA, et al., editors. Jasper's Basic Mechanisms of the Epilepsies [Internet]. 4th edition. Bethesda (MD): National Center for hnology Information (US); 2012. Available from: http://www.ncbi.nlm.nih.gov/books/NBK98183/).

The exact role of SV2A remains unclear but studies suggest that changes in the sion of SV2A affect ic fianction (Nowack et al. "Levetiracetam reverses ic deficits produced by overexpression of SV2A" PLoS One 2011, Volume 6 (12), e29560). It has also been ted that SV2A is a key player in exocytosis and is involved in neurotransmission (Crowder et al. "Abnormal neurotransmission in mice lacking ic vesicle protein 2A (SV2A)" Proc Nat Acad Sci USA 1999, 96, pp. 15268-15273) and studies in knock-out mice suggest that lack of SV2A results in an imbalance between glutamatergic and GABAergic neurotransmission (Venkatesan et al. "Altered balance between excitatory and inhibitory inputs onto CA pyramidal neurons from SV2A-deficient but not SV2B-def1cient mice" J Neurosci Res 2012, 90, pp. 327). Decreased expression of SV2A may be a consequence of seizure activity and may be involved in the progression of epilepsy (van Vliet et al. ased expression of synaptic vesicle protein 2A, the g site for levetiracetam, during togenesis and chronic epilepsy" Epilepsia 2009, 50, pp. 422-433; Feng et al.

"Down-regulation of synaptic e protein 2A in the anterior temporal neocortex of patients with intractable epilepsy" J Mol Neurosci 2009, 39, pp. 354-359; Toering et al.

"Expression patterns of synaptic vesicle protein 2A in focal cortical dysplasia and TSC- al tubers" Epilepsia 2009, 50, pp. 1409-1418) and epileptogenesis in patients with brain s (de Groot et al. "Expression of synaptic vesicle protein 2A in epilepsy- associated brain tumors and in the peritumoral cortex" Neuro-Oncology 2010, 12, pp. 3).

SV2A ligands include levetiracetam (Lynch et al. "The synaptic e protein SV2A is the binding site for the antiepileptic drug levetiracetam" Proc. Natl. Acad. Sci. USA 2004, Vol. 101, pp. 9861-9866), brivaracetam and seletracetam (Kaminski RM, et al.

"Targeting SV2A for ery of Antiepileptic Drugs". In: Noebels JL, Avoli M, Rogawski MA, et al., s. Jasper's Basic isms of the Epilepsies [Internet]. 4th edition. Bethesda (MD): National Center for Biotechnology Information (US); 2012. ble from: http://www.ncbi.nlm.nih.gov/books/NBK98183/; Nowack et al.

"Levetiracetam reverses synaptic deficits produced by overexpression of SV2A" PLoSone December 2011, Vol. 6(12), e29560).

Levetiracetam, (-)-(S)-(x-ethyloxo-l-pyrrolidine acetamide or (S)(2- rolidin- l -yl)butanamide, (EXO is an antiepileptic drug. It showed no activity in traditional acute models (maximal electroshock and pentylenetetrazol seizure tests) but was found potent in chronic epilepsy models and in genetic models of generalized epilepsy. It has shown a high safety margin compared to other antiepileptic drugs (Klitgaard "Levetiracetam: the preclinical profile of a new class of antiepileptic drugs" Epilepsia 2001, 42 (Supplement 4), pp. 13-18). It is commercialized under the trademark Keppra®, available as tablets, as an oral solution, and as a concentrate made up into a solution for infusion. Keppra® has been approved in Europe as a monotherapy in patients from 16 years of age with newly diagnosed epilepsy, in the treatment of partial-onset seizures (fits) with or without secondary generalization and as an add-on therapy for use with other anti-epileptic drugs in the treatment of partial-onset seizures with or without generalization in patients from 1 month of age; myoclonic seizures in patients from 12 years of age with juvenile myoclonic epilepsy; and primary generalized tonic-clonic seizures in ts from 12 years of age with idiopathic generalized epilepsy (www.ema.europa.eu). Keppra® has also been approved in the USA as an add-on therapy for the ent of partial onset seizures in patients from 1 month of age; myoclonic seizures in ts 12 years of age and older with juvenile myoclonic epilepsy; and primary generalized clonic seizures in patients 6 years of age and older with idiopathic generalized epilepsy. Keppra XR®, available as extended-release tablets, has been approved in the USA for the add-on treatment of l onset seizures in patients 16 years of age and older with epilepsy //www.accessdata.fda.gov/scripts/cder/drugsatfda/index.cfm).

Brivaracetam, the 4-n—propyl analog of levetiracetam, (2S)[(4R)-oxopropyl— pyrrolidinyl]butanamide, NH2 is in clinical trials and investigated as monotherapy in partial onset seizures and post- ic neuralgia and as add-on therapy in refractory partial onset seizures, Unverricht-Lundborg disease in adolescents and adults and in photosensitive epilepsy (www.clinicaltrialsgov). 2O Seletracetam, (2S)[(4S)(2,2,-difluorovinyl)oxo-pyrrolidinyl]butanamide, NH2 has been tested in clinical .

Processes for the preparation of the three compounds are known in the literature. For instance, processes for making racetam are disclosed for instance, in EP 0 162 036 and in GB 2 225 322. A process for the preparation of Brivaracetam is disclosed for ce in W0 01/62726. A process for the preparation of Seletracetam is known 2015/051029 for instance from W02005/121082. Alternative processes for making the three compounds are disclosed in EPl806339.

Antiepileptic drugs have found usefulness in neurological and psychiatric disorders, including neuropathic pain, migraine, essential tremor and in anxiety, schizophrenia and bipolar disorder (Landmarck "Antiepileptic drugs in non-epilepsy disorders.

Relations between mechanisms of action and clinical efficacy" CNS Drugs 2008, Vol. 22(1), pp. 27-47; Calabresi et al. "Antiepileptic drugs in migraine: from clinical s to cellular mechanisms" Trends in Pharmacological Sciences 2007, Vol. 28(4), pp. 188- 195; Rogawski and Loscher "The neurobiology of antiepileptic drugs for the treatment ofnonepileptic conditions" Nat Med 2004, Vol. 10, pp. 685-692).

Levetiracetam has been found effective or potentially ive in a wide-spectrum of neuropsychiatric disorders including mood disorders (Muralidharan and Bhagwagar "Potential of levetiracetam in mood disorders: a preliminary review" CNS Drugs 2006, Vol. 20, pp. 969-979; Mula et al. "The role of anticonvulsant drugs in anxiety disorders: a critical review of the ce" J Clin Pshycopharmac012007, Vol. 27, pp. 263-272), anxiety ers (Kinrys et al. "Levetiracetam as adjunctive therapy for refractory anxiety disorders" J Clin Psychiatry 2007, Vol. 68, pp. 1010-1013; Zhang et al. iracetam in social phobia: a placebo controlled pilot study" J Psychopharmac012005, Vol. 19, pp. 551-553; Kinrys et al. "Levetiracetam for treatment-refractory posttraumatic stress disorder" J Clin Psychiatry 2006, Vol. 67, pp. 21 1-214), pain (Enggaard et al. "Specif1c effect of levetiracetam in experimental human pain models" Eur J Pain 2006, Vol. 10, pp. 193-198; Dunteman "Levetiracetam as an tive analgesic in neoplastic plexopathies: case series and commentary" J Pain Palliative Care cother 2005, Vol. 19, pp. 35-43; Price "Levetiracetam in the treatment ofneuropathic pain: three case studies" Clin J Pain 2004, Vol. 20, pp. 33-36), movement disorders (Bushara et al. "The effect of levetiracetam on essential tremor" Neurology 2005, Vol. 64, pp. 1078-1080; McGavin et al iracetam as a treatment for tardive esia: a case report" Neurology 2003, Vol. 61, pp. 419; Woods et al.

"Effects of levetiracetam on tardive dyskinesia: a randomized, double-blind, placebo- controlled study" J Clin Psychiatry 2008, Vol. 69, pp. 546-554; Zivkovic et al.

"Treatment of tardive dyskinesia with racetam in a transplant t" Acta Neurol Scand 2008, Vol. 117, pp. 3; o et al. "Dramatic response to levetiracetam in post-ischaemic Holmes’ tremor" J Neurol Neurosurg Psychiatry 2007, Vol. 78, pp. 43 8-439) and it is suspected to show potentially beneficial effects in cognitive fianctioning (Piazzini et al. iracetam: An improvement of ion and of oral fluency in patients with partial epilepsy" Epilepsy Research 2006, Vol. 68, 2015/051029 181-188; de Groot et al. "Levetiracetam improves verbal memory in high-grade glioma patients" Neuro-oncology 2013, Vol. 15(2), pp. 216-223; Bakker et al. "Reduction of hippocampal hyperactivity improves cognition in amnestic mild cognitive impairment" Neuron 2012, Vol. 74, pp. 467-474; for a review: Eddy et al. "The cognitive impact of antiepileptic drugs" Ther Adv Neurol Disord 2011, Vol. 4(6), pp. 385-407 and references cited therein; Wheless "Levetiracetam in the treatment of ood epilepsy" Neuropsychiatric Disease and Treatment 2007, Vol. 3(4), pp. 409-421), and behavioral symptoms in dementia (Dolder and Nealy "The efficacy and safety of newer anticonvulsants in patients with ia" Drugs Aging 2012, Vol. 29(8), pp. 627- 63 7). Animal data and some preliminary al trials suggest that racetam have potential for restraining post-traumatic epilepsy, such as those caused by status epilepticus, traumatic brain injury and ischemic stroke, and it appears to have neuroprotective effects. The ial of racetam in easing epileptogenesis or cognitive dysfiJnction remains to be ascertained by conclusive animal and clinical studies (for reviews: Loscher and Brandt "Prevention or modification of togenesis after brain insults: experimental approaches and translational research" Pharmacol Rev 2010, Vol. 62, 668-700; Shetty "Prospects of levetiracetam as a neuroprotective drug t status ticus, traumatic brain injury and stroke" Front. Neur.2013, 4: 172. Doi: 10.3389/fneur.2013.00172) as it has displayed antiepileptogenic activity in the kindling model in mice and rats. It has also been suggested that levetiracetam inhibits glutamate release (Lee et al. "Levetiracetam inhibits glutamate transmission through presynaptic P/Q-type calcium channels on the granule cells of the dentate gyrus" British Journal of Pharmacology 2009, Vol. 158, pp. 1 75 3 - 1 762).

Seletracetam and Brivaracetam, have been found to reduce the severity of dystonia in the dtSZ mutant r model and may be helpful in some patients suffering from dyskinetic and dystonic movement disorders (Hamann et al. "Brivaracetam and seletracetam, two new SV2A ligands, improve paroxysmal dystonia in the dtSZ mutant hamster" European Journal of Pharmacology 2008, Vol. 601, pp. 99-102).

Positive allosteric modulators ofmGluR2 have d ly as promising novel therapeutic approaches for the treatment of several CNS disorders, including epilepsy, and some mGluR2 PAMs are currently undergoing clinical trials for the treatment of schizophrenia, and anxiety-depression (www.clinicaltrials.gov, see for instance: JNJ— 4041 1813/ADX71 149 by Addex Therapeutics and n Pharmaceuticals, Inc.). The initial suggestion that drugs that dampen glutamatergic transmission may be efficacious in the treatment of epilepsy came from acute inical studies with mixed mGlu2/3 2015/051029 receptor ts (Moldrich et al. "Glutamate metabotropic receptors as targets for drug therapy in epilepsy" Eur J Pharmacol. 2003, Vol. 476, pp. 3-l6). LY379268 and LY389795, two mGlu2/3 receptor agonists, were found ineffective in blocking MES seizures up to doses producing motor ment but were found effective in the 6 Hz model in a dose-dependent manner (Barton et al. "Comparison ofthe effect of glutamate receptor modulators in the 6 Hz and maximal electroshock seizure " Epilepsy Research 2003, Vol. 56, pp. 17-26). Continued administration of an mGlu2/3 agonist xically induced seizure activity in long-term toxicology studies (Dunayevich et al. "Efficacy and tolerability of an mGlu2/3 agonist in the treatment of generalized anxiety disorder" Neuropsychopharmacology. 2008, Vol. 33(7), pp. 1603- ). This paradoxical effect may be related to agonist-induced changes in the sensitivity ofthe receptor system (tachyphylaxis), but has not been reported r in preclinical models of epilepsy. Positive allosteric modulators, in contrast, modulate ongoing neurotransmission but are not ly stimulatory, thereby reducing the risk for tachyphylaxis.

Prior to seizure activity, increases in extracellular glutamate are measured in human hippocampus and the increase is sustained during epileptogenic activity (During and Spencer "Extracellular hippocampal glutamate and spontaneous seizure in the conscious human brain" Lancet 1993, Vol. 341(8861), pp. 1607-10), thus lending support to the idea that a reduction in ate levels may be of benefit in the treatment of epilepsy. In fact, during seizure ty glutamate levels increase to potentially neurotoxic . Seizure activity results in ssive ural damage in human brain inducing further abnormalities in glutamate metabolism (Petroff et al.

"Glutamate-glutamine cycling in the epileptic human ampus" Epilepsia 2002, Vol. 43(7), pp. 703-10). Thus, an mGluR2 positive allosteric modulator or an mGluR2 orthosteric t may be expected to protect against seizure-induced neuronal damage.

WO2009/033704 and WO2010/130424 disclose mGluR2 ve allosteric tors, uses thereof and processes for synthesizing the compounds.

W01997/18199 and W02003/104217 disclose excitatory amino acid receptor modulator compounds that later were shown to have mGlu2/3 orthosteric agonist activity (see for example Rorick-Kehn et al. (2007) The Journal of Pharmacology and Experimental therapeutics Vol. 321, No. 1, pp. 308-317), further scientific and patent literature disclose additional examples of compounds having mGlu2/3 orthosteric t activity, and W02008/150233 discloses compounds with mGluR2 eric activator activity.

Currently available anti-epileptic drugs do not solely affect glutamatergic transmission. Their mechanism of action is generally conceptualized as altering the balance between excitatory (glutamate-mediated) and inhibitory mediated) transmission (Johannessen Landmark "Antiepileptic drugs in non-epilepsy disorders: relations between mechanisms of action and clinical cy" CNS Drugs 2008, Vol. 22(1), pp. 27-47).

A significant limiting factor in the use of SV2A ligands is tolerability and side-effect e.

For example the effective dose of levetiracetam for l onset seizures is dosed at 1000 mg, 2000 mg, and 3000 mg, given as twice-daily. The side effects reported for levetiracetam include aggressive or angry behavior, anxiety, change in personality, chills, cough or hoarseness, crying, depersonalization, diarrhea, dry mouth, euphoria, fever, general feeling of discomfort or illness, headache, hyperventilation, irregular heartbeats, irritability, joint pain, loss of appetite, lower back or side pain, mental depression, muscle aches and pains, nausea, l or difficult urination, paranoia, quick to react or act emotionally, rapidly ng moods, restlessness, shaking, shivering, ess of breath, sleepiness or unusual drowsiness, sore throat, stuffy or runny nose, sweating, trouble ng, unusual tiredness or weakness and vomiting. Thus, there is still a need to provide an ive treatment with a lower effective dose of levetiracetam and a more favourable side effect profile for the treatment of epilepsy and related ers, not only in the adult but also in the pediatric population.

Y OF THE INVENTION In a particular aspect, the present invention provides a combination comprising (a)a synaptic vesicle protein 2A ("SV2A") ligand selected from the group consisting of levetiracetam, brivaracetam and seletracetam; and (b) a positive allosteric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 ("mGluR2") nd having the formula , or a pharmaceutically acceptable salt or a solvate thereof.

[FOLLOWED BY PAGE 8a] - 8a - In another particular aspect, the present ion provides the use of a positive allosteric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 compound having the formula , or a pharmaceutically acceptable salt or a solvate thereof and at least an SV2A ligand selected from the group consisting of levetiracetam, brivaracetam and acetam, in the manufacture of medicaments for the treatment of epilepsy or related disorders; neuropathic pain; migraine or resistant headache; or r and related ers, wherein the medicaments are to be administered simultaneously or sequentially in combination therapy.

BRIEF PTION OF THE FIGURES Figure 1A and B: Dose response for the 6Hz 44mA ED50 determination for the Co. No. 2 and LEV alone and in combination. Figure 1A: Co. No. 2 increases the potency and efficacy of levetiracetam ln the 6Hz (44mA) test. Figure 1B Levetiracetam increases the potency of Co. No. 2 In the 6 Hz (44mA) test.

Figure 2: Isobolographic analysis for the combination of Co. No. 1 with levetiracetam (LEV) in the 6Hz (44 mA) assay. Initial ED50 values (shown below) were determined for both Co. No. 1 and LEV (data points on x- and y-axes; filled diamonds). The theoretical line of additivity connects the calculated ED50 values for the two compounds (solid black line). tical ED50 (+ SEM) for three fixed dose ratio combinations (LEV: Co. No. 1) are plotted: 1:3 – filled squares/solid black line, 1:1 – filled upward triangles/solid black line, and 3:1 – filled downward les/solid black line. Experimental treatment doses were initially derived from theoretical values and adjusted according to observed s. Experimentally-determined ED50 (+ SEM) [FOLLOWED BY PAGE 9] values for each fixed dose-ratio combination are also shown: 1:3’ — open squares/dotted line, 1:1’ — open upward triangles/dotted line, and 3 :1’ — open downward triangles/dotted line. isons between theoretical and experimentally-determined ED50 values were compared using a t-test (***P<0.001). N=8 per group. In Figure 2, the ratio ofLEV to Co. No. 1 is depicted as follows: LEV : Co. No. 1 ratio I 1:3 Ar 1:l —V— 3:1 --E|-- 1:3’ "fin 1:1’ ED50 (LEV) = 345 mg/kg (211-485) (intraperitoneally, "Vu 3:1’ i.p.) ED50 (Co. No. 1) = 10.2 mg/kg (3.1-12.4) (s.c.) Figure 3: Combination Studies for Co. No. 25-3 with levetiracetam (LEV) in the 6Hz Assay (44 mA). At a dose of 10 mg/kg s.c., Co. No. 25-3 increases the potency of LEV, g to an approximate 70-fold shift in the ED50. This suggests a positive codynamic relationship.

Figure 4: Combination Studies for Co. No. 2-21 with levetiracetam (LEV) in the 6 Hz Assay (44 mA). At a dose of 10 mg/kg s.c., Co. No. 2-21 increases the potency ofLEV, leading to an approximate 35-fold shift in the ED50. This suggests a positive pharmacodynamic relationship.

Figure 5: Combination Studies for Co. No. 6—b with levetiracetam (LEV) in the 6 Hz Assay (44 mA). At a dose of 10 mg/kg p.o., Co. No. 6-b ses the potency of LEV, leading to an approximate 100-fold shift in the ED50. This ts a positive codynamic relationship.

Figure 6: Combination Studies for LY-404039 with levetiracetam (LEV) in the 6Hz 2O Assay (44mA). At a dose of 5 mg/kg s.c., LY-404039 increases the potency ofLEV, leading to an approximate 27-fold shift in the ED50. This ts a positive pharmacodynamic relationship.

DESCRIPTION OF THE INVENTION The present invention relates to a combination comprising (a) a synaptic vesicle protein 2A ("SV2A") ligand; and (b) a positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 ("mGluR2") nd or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric agonist of metabotropic glutamatergic receptor subtype 2 nd or a pharmaceutically acceptable salt or a solvate thereof.

In a particular embodiment, the ion as described herein relates to a pharmaceutical ation, in particular a pharmaceutical combination t, comprising (a) a synaptic vesicle n 2A ("SV2A") ; and (b) a positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor e 2 ("mGluR2") nd or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric agonist of metabotropic glutamatergic receptor subtype 2 compound or a pharmaceutically able salt or a solvate f; (c) at least one pharmaceutically acceptable carrier.

In a fiarther embodiment, the invention relates to the combination described herein for use as a medicament.

A further embodiment of this invention relates to the use of the combination described herein for the manufacture of a medicament or a pharmaceutical product for the treatment or prevention of epilepsy and related disorders; neuropathic pain; migraine or resistant headache and bipolar and related disorders.

A further embodiment of this invention relates to the use of the combination described herein for the manufacture of a medicament or a pharmaceutical product for neuroprotection.

A further embodiment of this invention relates to the use of the combination bed herein for the manufacture of a medicament or a pharmaceutical product for the prevention of epileptogenesis.

A further embodiment relates to the treatment or tion of epilepsy and d disorders; neuropathic pain; migraine or resistant headache; and bipolar and related disorders of a t comprising stering concurrently or sequentially to the subject in need thereof a synaptic vesicle protein 2A ("SV2A") ligand; and a positive allosteric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 ("mGluR2") compound or a pharmaceutically acceptable salt or a solvate thereof, or an 2015/051029 orthosteric agonist of metabotropic glutamatergic receptor subtype 2 nd or a pharmaceutically acceptable salt or a solvate thereof, in amounts that would be therapeutically ive when the SVZA ligand and mGluR2 compound are administered together.

A further embodiment relates to a combination as described herein for neuroprotection; or to a combination as described herein for use in neuroprotection.

A r embodiment relates to a combination as described herein for the prevention of epileptogenesis; or to a combination as described herein for use in the prevention of epileptogenesis.

IO In a further embodiment the invention relates to a method of treating or preventing epilepsy and related disorders; athic pain; migraine or resistant headache; bipolar and related disorders in patients comprising administering a fixed dose combination of (a) a synaptic vesicle protein 2A ("SVZA") ligand; and (b) a positive allo steric modulator ("PAM") of metabotropic atergic receptor subtype 2 ("mGluR2") compound or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric t of metabotropic glutamatergic receptor subtype 2 compound or a pharmaceutically acceptable salt or a solvate thereof, in s that would be therapeutically effective when the SVZA ligand and mGluR2 compound are administered together.

In a fiarther embodiment the invention relates to a method of neuroprotection with a combination as defined herein.

In a fiarther ment the invention relates to a method of anti-epileptogenesis with a combination as defined herein.

A further embodiment relates to a method for the treatment or prevention of sy and related disorders; neuropathic pain; migraine or resistant headache; bipolar and related ers said method comprising administering a therapeutically effective amount of a combination or a ation product comprising (a) a synaptic vesicle protein 2A ("SVZA") ligand; and (b) a ve allo steric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 ("mGluR2") compound or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric agonist of metabotropic glutamatergic or subtype 2 compound or a pharmaceutically acceptable salt or a solvate thereof, to a subject in need thereof, such as a warm-blooded animal, in particular a human.

A r embodiment relates to a method ofneuroprotection, said method comprising administering a therapeutically effective amount of a combination or a ation product comprising (a) a synaptic vesicle n 2A ("SV2A") ligand; and (b) a positive allosteric modulator ) of tropic glutamatergic receptor subtype 2 ("mGluR2") compound or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric agonist of metabotropic glutamatergic receptor subtype 2 compound or a pharmaceutically acceptable salt or a solvate thereof, to a t in need thereof, such as a warm-blooded animal, in particular a human.

A further embodiment relates to a method of anti-epileptogenesis, said method comprising administering a therapeutically effective amount of a combination or a combination product comprising (a) a synaptic vesicle protein 2A ("SV2A") ligand; and (b) a positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor e 2 ("mGluR2") compound or a pharmaceutically acceptable salt or a solvate thereof, or an teric agonist of metabotropic glutamatergic receptor e 2 compound or a pharmaceutically acceptable salt or a solvate thereof, to a subject in need thereof, such as a warm-blooded animal, in particular a human.

In an additional embodiment, the present invention s to a pharmaceutical t or a commercial package comprising a combination according to the invention as bed herein, in ular together with instructions, for simultaneous, te or sequential use f in the ent or prevention of epilepsy and related disorders; neuropathic pain; migraine or resistant headache bipolar; and related disorders.

In an additional embodiment, the present invention relates to a pharmaceutical product or a commercial package comprising a combination according to the invention as described herein, in particular together with instructions, for simultaneous, separate or sequential use thereof in neuroprotection.

In an additional embodiment, the present invention relates to a pharmaceutical product or a commercial package comprising a combination according to the invention as bed herein, in particular together with instructions, for aneous, separate or sequential use thereof in anti-epileptogenesis.

In a further embodiment the invention relates to a combination comprising a quantity which is jointly therapeutically effective against epilepsy and related disorders; neuropathic pain; ne or resistant headache; bipolar and related disorders; of (a) a synaptic vesicle protein 2A ("SV2A") ligand; and (b) a positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 ("mGluR2") compound or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric agonist of metabotropic glutamatergic receptor subtype 2 compound or a pharmaceutically acceptable salt or a solvate f, and at least one pharmaceutically acceptable r.

In a r embodiment the ion relates to a combination comprising a quantity which is jointly therapeutically effective as rotectant, of (a) a synaptic vesicle protein 2A ("SV2A") ligand; and (b) a positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 R2") compound or a pharmaceutically able salt or a solvate thereof, or an teric t of metabotropic glutamatergic receptor 2O subtype 2 compound or a pharmaceutically acceptable salt or a solvate thereof, and at least one pharmaceutically acceptable carrier.

In a further embodiment the invention relates to a combination comprising a ty which is jointly therapeutically effective in the prevention of epileptogenesis, of (a) a synaptic vesicle protein 2A ("SV2A") ligand; and (b) a positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor e 2 ("mGluR2") nd or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric t of metabotropic glutamatergic receptor subtype 2 compound or a pharmaceutically acceptable salt or a solvate thereof, and at least one pharmaceutically acceptable carrier. 3O In a fiarther embodiment, the invention relates to the use of (a) a synaptic vesicle protein 2A ("SV2A") ligand; and (b) a positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor subtype 2 R2") compound or a pharmaceutically acceptable salt or a solvate thereof, or an orthosteric t of metabotropic glutamatergic receptor subtype 2 compound or a pharmaceutically acceptable salt or a solvate thereof, for the preparation of a ation product according to the present invention.

The (b) components of the combination of the invention are in general referred to herein as 2 compounds" or "mGluR2 PAM/agonist nds", or "positive allosteric modulator of mGluR2/mGluR2 orthosteric agonist compound" meaning that the nds have mainly activity at the metabotropic glutamatergic receptor subtype 2, and are in particular selected from positive allosteric modulators (PAMs) of tropic glutamatergic receptor subtype 2, and orthosteric agonists of metabotropic glutamatergic receptor subtype 2. A skilled person will be familiar with the large homology ofmGluR2 and mGluR3, due to which some mGluR2 orthosteric agonists also display activity as mGluR3 orthosteric agonists. Such is the case for example, of R,4S,5S,6S)—4-aminosulfonylbicyclo[3 . l .0]—hexane-4,6- dicarboxylic acid (also known as LY-404,039 [CAS 6353185]), with a K = 149 nM (mGlu2 receptor) and K1- : 92 nM (mGlu3 receptor), lOO-fold selectivity for mGlu2 and mGlu3 over mGlu4a, -6, -7a, and -8a, and no activity at mGlula and mGluSa k-Kehn et al. (2007) The Journal of Pharmacology and mental 2O Therapeutics Vol. 321, No. 1, pp. 308—317). The term "mGluR2 compounds" or 2 onist compounds", or "positive allosteric modulator of mGluR2/mGluR2 orthosteric agonist compound" does therefore not e compounds displaying some other additional minor activity in vitro or in vivo.

The mGluR2 PAM compounds of the combination of the invention are in particular selected from those disclosed in W02010/130424. A particular subgroup of said compounds disclosed in W0201 0/130424 can be defined by the following Formula (I) R2 N, , N — (I) or a stereoisomeric form thereof; wherein R1 is selected from the group consisting of (C3_7cycloalkyl)C1-3alkyl-, mono- or 3O polyhaloC1_4alkyl, and (C1_4alkyl)-O-(C1-4alkyl); R2 is halo or polyhaloC1_4alkyl; A is a covalent bond or a —CH2—; L is selected from the radicals (a), (b) and (c): wherein R3a is selected from unsubstituted phenyl or phenyl tuted with l or 2 halo tuents; R4&1 is selected from the group of hydrogen, C1_3alkyl and halo; or R3a-C-R4a together represent a radical of formula (a-l) R581 (a-l) wherein R5&1 is hydrogen or halo; R3b is selected from the group of phenyl substituted with l or 2 halo substituents, pyridinyl substituted with l or 2 halo substituents, unsubstituted pyrimidinyl and dinyl substituted with l or 2 C1_3alkyloxy substituents; or a pharmaceutically acceptable salt or a solvate thereof.

Thus, according to a particular embodiment of the invention, the positive allo steric modulator ("PAM") of metabotropic glutamatergic receptor e 2 ("mGluR2") compound is a compound of Formula (I) as defined herein.

In a particular embodiment, the compounds of Formula (I) are as defined herein R1 is selected from the group consisting of cyclopropylmethyl-, 2,2,2-trifluoroethyl, 2O and CH2-; R2 is chloro or CF3; A is a covalent bond or a —CH2—; L is selected from the radicals (a), (b) and (c): Rsa’Q /N pN,x' N _____ R4a R (a) (b) wherein R3&1 is selected from unsubstituted phenyl or phenyl substituted with l or 2 fluoro substituents; R4&1 is selected from the group of hydrogen, methyl and fluoro; or R3a-C-R4a together represent a l of formula (a-l) (3-1) wherein R a 1s hydrogen or fluoro;. 5 .

R3b is selected from the group ofphenyl substituted with l or 2 fluoro substituents, pyridinyl substituted with l or 2 fluoro substituents, unsubstituted dinyl and dinyl substituted with l or 2 methoxy substituents; or a pharmaceutically acceptable salt or a solvate thereof.

In a particular embodiment, the compounds of Formula (I) are as defined herein wherein (i) when A is CH2; and R2 is romethyl; then R1 is cyclopropylmethyl-; and L is selected from 07» 7» b @8ng(N (L-a); (L-b); (L-c); (L-d); and (L-e); (ii) when A1s CH2; and R21s chloro; then R1 is cyclopropylmethyl—; and L is (L-a); (iii) when A is a covalent bond; and R2 is trifluoromethyl; then R1 is cyclopropylmethyl; and L is selected from <\:N/>7N\_/N—§—N m \OA<\:N/>7N\_/N—§—N /—\ (L-b); (L-e); (L-f); and (L-g); (iV) when A is a nt bond and R2 is Cl; then (iv-a) R1 is cyclopropylmethyl and L is (L-a); (iv-b) R1 is 2,2,2-trifluoroethyl and L is selected from N7" NA (L-d); and (L-h); (V) when A is CH2 and R1 is —CH2-O-CH3; then R2 is —CF3 and L is 3c E rac-(2au, 30L, 3am) (L-i); or a pharmaceutically acceptable salt or a solvate thereof The compounds of Formula (I) are disclosed in WOZOlO/130424 and may be prepared according to the processes described therein, which are hereby incorporated by nce in their totality.

Particular compounds of Formula (I) include _ l8 _ F NQU/N‘/\N / /N\ F30 /N‘/N F R mad" Co. No. 1; or a hydrochloride salt thereof Co. No. 2; or a hloride salt (Co. No. 1a) thereof (.HCl) (Co. No. 23) N / /N\ \ N /N 3 R N / /N\ F R/ Co. No. 3 Co. No. 4 QNd(\N/béNN N«Cf/ N \ N / / \ \ N / F 1Q Co. No. 6; or a hydrochloride salt Co. No. 5 thereof (Co. N0. 63) F3C N\ F / N /N\N / ‘F N N N / NM o _ C >7N\ / \ / N _ Co. No. 7 Co. No. 8 F F CI N /N\N \ { ’ ,N‘N ; 2 / ’ o wN N NM {>0 MA/ Co. No. 9 Co. No. 10 ’N‘N F F CI N\ F N / My 0 — F Co. No. 11 Co. No. 12 F N,N H )flN F \/ F / /N, Q ? ’ NO / Nd \ N /N W Q | I H"‘ N / F R rac-(2au,30t,3a0t) Co. No. 13 Co. No. 14 In an embodiment of the invention, the compound of Formula (I) is Co. No. 1; or a pharmaceutically acceptable salt thereof, preferably a hydrochloride salt thereof.

In an additional embodiment of the invention, the compound of Formula (I) is F3C N e / N Co. No. 2; or a ceutically able salt thereof, preferably a hydrochloride salt thereof (.HCl).

The mGluR2 PAM compounds of the combination ofthe invention are also in particular selected from those disclosed in W02009/033704. Said compounds disclosed in W02009/033704 can be defined by the following Formula (I-A) R3 (I-A) and the stereochemically isomeric forms thereof, wherein R1 is C1_6alkyl; or C1_3alkyl substituted with C3_7cycloalkyl, , or phenyl tuted with halo, trifluoromethyl or romethoxy; R2 is halo, trifluoromethyl, C1_3alkyl or cyclopropyl; R3 is hydrogen, fluoro, hydroxyl, hydroxyC1_3alkyl, hydroxyC1_3alkyloxy, fluoroC1_3alkyl, fluoroC1_3alkyloxy or cyano; and Ar is unsubstituted phenyl; or phenyl substituted with n radicals R4, wherein n is l, 2 or R4 is selected from the group consisting of hydrogen, halo, C1_3alkyl, hydroxyC1_3alkyl, polyhaloC1_3alkyl, cyano, hydroxyl, amino, carboxyl, C1_3alkyloxyC1_3alkyl, C1_3alkyloxy, polyhaloC1_3alkyloxy, C1_3alkylcarbonyl, mono- and di(C1_3alkyl)amino, and morpholinyl; or two vicinal R4 radicals taken er form a bivalent radical of formula —N=CH-NH- (i), -CH=CH-NH- (ii), or -O-CH2-CH2-NH- (iii); or R3 and a R4 radical in ortho position taken together form a bivalent radical of formula -CH2-O- (iv), or -O-CH2- (v); and the ceutically acceptable salts and the es f.

In a particular embodiment, the compounds of Formula (I-A) are as defined herein R1 is C1_6alkyl; or C1_3alkyl substituted with C3_7cycloalkyl, phenyl, or phenyl substituted with halo, trifluoromethyl or trifluoromethoxy; R2 is halo, trifluoromethyl, C1_3alkyl or cyclopropyl; R3 is hydrogen, fluoro, hydroxyl, hydroxyC1_3alkyl, hydroxyC1_3alkyloxy, fluoroC1_3alkyl, fluoroC1_3alkyloxy or cyano; and Ar is tituted phenyl, or phenyl substituted with n ls R4, wherein n is l, 2 or R4 is selected from the group ting ofhydrogen, halo, C1_3alkyl, hydroxyC1_3alkyl, polyhaloC1_3alkyl, cyano, hydroxyl, amino, carboxyl, C1_3alkyloxyC1_3alkyl, C1_3alkyloxy, loC1_3alkyloxy; C1_3alkylcarbonyl, mono- 3O and di(C1_3alkyl)amino, and morpholinyl ; or two vicinal R4 radicals taken together form a bivalent radical of formula NH- (i), -CH=CH—NH- (ii), or -O-CH2-CH2-NH- (iii); and the pharmaceutically acceptable salts and so lvates thereof In a particular embodiment, the compounds of Formula (I-A) are as defined herein wherein R1 is C1_6alkyl; or C1_3alkyl substituted with C3_7cycloalkyl, phenyl or phenyl substituted with halo, trifluoromethyl or trifiuoromethoxy; R2 is halo, trifluoromethyl, C1_3alkyl or cyclopropyl; R3 is hydrogen, fiuoro, hydroxyl, hydroxyC1_3alkyl, hydroxyC1_3alkyloxy, fluoroC1_ galkyl, fiuoroC1_3alkyloxy or cyano; and Ar is unsubstituted phenyl; and the pharmaceutically acceptable salts and so lvates thereof.

In an additional embodiment, the compounds of Formula (I-A) are as defined herein wherein R1 is l-butyl, 2-methyl-l-propyl, 3-methyl-l-butyl, (cyclopropyl)methyl or 2- (cyclopropyl)ethyl; R3 is hydrogen, fluoro or cyano; and Ar is unsubstituted phenyl; and the pharmaceutically acceptable salts and so lvates thereof.

In an additional embodiment, the compounds of Formula (I-A) are as defined herein wherein R1 is l-butyl, 3 -methyl- 1 , (cyclopropyl)methyl or 2-(cyclopropyl)- l -ethyl; R2 is chloro; R3 is hydrogen or fluoro; and Ar is unsubstituted phenyl; and the pharmaceutically able salts and the solvates thereof.

In a fiarther embodiment, the nds of Formula (I-A) are as defined herein wherein R1 is kyl; or C1_3alkyl substituted with C3_7cycloalkyl, phenyl, or phenyl 3O substituted with halo, trifluoromethyl or trifiuoromethoxy; R2 is halo, romethyl, kyl or cyclopropyl; R3 is hydrogen, fiuoro, hydroxyl, hydroxyC1_3alkyl, hydroxyC1_3alkyloxy, fluoroC1_3alkyl, fiuoroC1_3alkyloxy or cyano; and Ar is phenyl tuted with n radicals R4, wherein n is l, 2, or 3; R4 is ed from the group consisting of halo, C1_3alkyl, hydroxyC1_3alkyl, C1_3alkyloxy, polyhaloC1_3alkyloxy, C1_3alkylcarbonyl, mono- and 3alkyl)amino, and morpholinyl; or two vicinal R4 radicals taken together form a bivalent radical of formula —N=CH-NH- (i), -CH=CH-NH- (ii), or -O-CH2—CH2-NH- (iii); or R3 and a R4 radical in ortho position taken together form a bivalent radical of formula -CH2-O— (iv), -O-CH2— (v); and the ceutically acceptable salts and so lvates thereof.

In an onal embodiment, the compounds of Formula (I-A) are as defined herein wherein R1 is l-butyl, 2-methyl- l -propyl, 3 lbutyl, (cyclopropyl)methyl or 2-(cyclopropyl)- l -ethyl; R3 is hydrogen, fluoro or cyano; and Ar is phenyl substituted with halo, romethyl, morpholinyl or hydroxyC1_3alkyl; and the pharmaceutically acceptable salts and so lvates thereof.

In an onal embodiment, the compounds of Formula (I-A) are as defined herein wherein R1 is l-butyl, 3 -methylbutyl, (cyclopropyl)methyl or 2-(cyclopropyl)- l -ethyl; R2 is ; R3 is hydrogen or fluoro; and Ar is phenyl substituted with at least one halo group; and the pharmaceutically acceptable salts and so lvates thereof.

In an additional embodiment, the compounds of Formula (I-A) are as defined herein wherein R1 is l-butyl, 3 -methylbutyl, (cyclopropyl)methyl or 2-(cyclopropyl)- l -ethyl; R2 is ; 3O R3 is hydrogen or fluoro; and Ar is phenyl substituted with at least two fluoro groups; and the pharmaceutically acceptable salts and so lvates thereof.

The compounds of Formula (I-A) are disclosed in /033704 and may be prepared according to the processes described therein, which are hereby incorporated by reference in their totality.

Particular nds of Formula (I-A) include WO 10435 _ 23 _ O o g5" me/ g0 09 Co. No. 19-21 BNfiw ffi Obj/V go E? Co. No. 20-21 :NW (Nb/V (>9 31/ Co. No. 21-21 636m; NM (>9 FW/ Co. No. 22-21 WO 10435 _ 24 _ D70"// Q76" C0. N0. 23-21 Co. No. 6-21 0" N0' 7'3 Co. No. 24-21 0 15:"M GO F/ In an ment of the invention, the compound of Formula (I-A) is / / N F N Co. No. 2-21 Co. No. 25-21, or a pharmaceutically acceptable salt or a solvate thereof.

The mGluR2 PAM compounds of the combination of the invention are also in particular selected from those disclosed in . Said compounds disclosed in can be defined by the following Formula (I-B) F N-—N NE;‘~R1 (1-f3) and the stereochemically isomeric forms thereof, wherein R1 is ed from the group consisting of C1_6alkyl, (C3_gcycloalkyl)C1-3alkyl, and (C1_3alkyloxy)C1_3alkyl; each R2 is independently selected fiom F, Cl, C1_3alkyl, C1_3alkyloxy, mono- or polyhaloC1_3alkyl, and mono- or polyhaloC1_3alkyloxy; n is an integer selected from 1, 2, and 3; and the pharmaceutically acceptable salts and the solvates thereof.

The mGluR2 PAM compounds of the combination of the invention are in particular selected fiom nds of a (I-B) as defined hereinabove, and stereoisomeric forms thereof, wherein R1 is selected from the group consisting of CH3CH2, CH3CH2CH2, (cyclopropyl)methyl, (cyclobutyl)methyl, ethyloxymethyl and methyloxymethyl; and the rest of variables are as defined herein; and the pharmaceutically acceptable salts and the solvates thereof.

In a fiarther embodiment, the mGluR2 PAM compounds of the combination of the invention are in ular selected from compounds of Formula (I-B) as defined hereinabove, and isomeric forms thereof, wherein R1 is selected from the group consisting of CH3CH2, (cyclopropyl)methyl, (cyclobutyl)methyl and methyloxymethyl; and the rest of variables are as defined herein; and the ceutically able salts and the so lvates thereof.

In a further embodiment, the mGluR2 PAM compounds of the combination of the invention are in particular selected from compounds of Formula (I-B) as defined hereinabove, and stereoisomeric forms thereof, wherein R1 is selected from the group consisting of CH3CH2, (cyclopropyl)methyl, butyl)methyl and ethyloxymethyl; and the rest of variables are as defined herein; and the pharmaceutically acceptable salts and the so lvates thereof.

Thus, according to a particular ment of the invention, the positive allo steric modulator ("PAM") of tropic glutamatergic receptor subtype 2 ("mGluR2") compound is a compound of Formula (I-B) as defined herein.

In an additional embodiment, the compounds of Formula (I-B) are as defined herein, wherein each R2 is independently ed fiom F, Cl, CH3, CH30 and CF3; and the pharmaceutically acceptable salts and the solvates thereof.

In a fithher embodiment, the compounds of Formula (I-B) are as defined herein having the a (I-Ba) F N"N N>\R1 (I-Ba) n the variables are as defined in Formula (I-B) herein, and the pharmaceutically able salts and the solvates thereof.

In a fithher embodiment, the compounds of Formula (I-B) are as defined herein having the Formula (I-Bb) F N"N N>\R1 (I-Bb) wherein the variables are as defined in Formula (I-B) herein, and the pharmaceutically acceptable salts and the solvates f.

Particular compounds of formula (I-B) include 3 -(Cyclopropylmethyl)[ l -(4-fiuorophenoxy)ethyl](trifiuoromethyl)[ l ,2,4]triazo lo- [4,3 -a]pyridine; 3-(Cyclopropylmethyl)[(l *R)- l -(4-fluorophenoxy)ethyl] (trifluoromethyl)[ l ,2,4]triazo lo [4,3-a]pyridine; 3 -(Cyclopropylmethyl) [(l * S)— l orophenoxy)ethyl] (trifluoromethyl)[ l ,2,4]triazo lo [4,3-a]pyridine; 3 -(Cyclopropylmethyl) [(l S)— l -(2,4-difluorophenoxy)ethyl] (trifluoromethyl)[ l ,2,4]triazo lo [4,3-a]pyridine; 3 -(Cyclopropylmethyl) [(l R)- l -(2,4-difluorophenoxy)ethyl] (trifluoromethyl)[ l ,2,4]triazo lo [4,3-a]pyridine; 3 -(Cyclopropylmethyl)[ l -(2,4-difiuorophenoxy)ethyl](trifluoromethyl)[ l ,2,4]triazo lo- [4,3 —a]pyridine; 3 -(Cyclopropylmethyl) [(l S)— l -(3 ,5 -difiuorophenoxy)ethyl] oromethyl)[ l ,2,4]triazo lo [4,3-a]pyridine; 3 -(Cyclopropylmethyl) [(l S)— l -(3 ,4-difiuorophenoxy)ethyl] (trifluoromethy1)[1 ,2,4]triaz010 [4,3-a]pyridine; 3 -(Cyc10propy1methy1)[(1 S)—1-(2,3-difluorophenoxy)ethy1] (trifluoromethy1)[1 ,2,4]triaz010 ]pyridine; 3 0propy1rnethy1) [(1 S)—1-(2,5 -difluorophenoxy)ethy1] (trifluoromethy1)[1 ,2,4]triaz010 [4,3-a]pyridine; 3 0propy1methy1)[(1S)(2,6-difluorophenoxy)ethy1] (trifluoromethy1)[1 riaz010 [4,3-a]pyridine; 3 -(Cyc10propy1rnethy1) [(1 S)(4-fluorornethoxyphenoxy)ethy1] (trifluoromethy1)[1 ,2,4]triaz010 [4,3-a]pyridine; 3 -(Cyc10buty1rnethy1)[ 1 -(2,4-difluorophenoxy)ethy1](trifluorornethy1)[ 1 ,2,4]triaz010- [4,3 idine; 7- [( 1 S)(2-Chlorornethy1phenoxy)ethy1]-3 -(cyclopr0py1rnethy1) (trifluoromethy1)[1 ,2,4]triaz010 [4,3-a]pyridine; 3 -(Cyc10propy1methy1) [(1 S)— 1 -(4-fluorornethy1phenoxy)ethy1] (trifluoromethy1)[1 ,2,4]triazo 10 [4,3-a]pyridine; 3 -(Cyc10propy1methy1)(trifluoromethy1) [(1 S)—1-(2,4,6- rophenoxy)ethy1] [1 ,2,4]triaz010 [4,3 idine; 7-[1-(2,4-Difluor0phenoxy)ethy1](eth0xyrnethy1)(triflu0r0rnethy1)[1 ,2,4]triazo10- [4,3 -a]pyridine; 3 -Ethy1—8-(triflu0rornethy1)[1-(2,4,6-triflu0r0phen0xy)ethy1][1 ,2,4]triaz010 [4,3 -a]pyridine; 7-[1-(2,4-Difluorophenoxy)ethy1]ethy1—8-(triflu0r0rnethy1)[ 1 ,2,4]triaz010[4,3 -a]pyridine; 3 -(Cyclobuty1rnethy1) [(1 * R)(2,4-difluorophenoxy)ethy1] (trifluoromethy1)[1 ,2,4]triaz010 [4,3-a]pyridine ; 3 -(Cyc10buty1rnethy1)[( 1 * S)(2,4-difluor0phenoxy)ethy1] (trifluoromethy1)[1 ,2,4]triaz010 [4,3-a]pyridine; 3 xyrnethy1)(trifluor0methy1) [(1 * R)(2,4,6- trifluorophenoxy)ethy1][1 ,2,4]triaz010 [4,3 -a]pyridine; 3 -(Eth0xyrnethy1)(trifluor0methy1) [(1 * S)(2,4,6- trifluorophenoxy)ethy1] [1 ,2,4]triaz010 [4,3 -a]pyridine; 7- [(1 * 2,4-Difluorophenoxy)ethy1]-3 -(ethoxyrnethy1) (trifluoromethy1)[1 ,2,4]triazo 10 [4,3-a]pyridine; 7- [(1 * R)(2,4-Difluor0phenoxy)ethy1]-3 -(eth0xyrnethy1) (trifluoromethy1)[1 ,2,4]triaz010 [4,3-a]pyridine; 7-[( 1 *R)(2,4-Difluorophenoxy)ethy1]-3 -ethy1—8-(trifluorornethy1)[1 ,2,4]triazo10- [4,3 —a]pyridine; 7- [(1 * S)(2,4-Difluorophenoxy)ethy1]-3 -ethy1—8-(trifluoromethy1)[1,2,4]triaz010- [4,3 —a]pyridine; 7-[ l -(2,4-Difluorophenoxy)ethyl]propyl(trifluoromethyl)[ l ,2,4]triazo lo [4,3-a]pyridine; 3 (trifluoromethyl)[(l *R)- l -(2,4,6-trifluorophenoxy)ethyl] -[ l ,2,4]triazo lo- [4,3-a]pyridine; 3 (trifluoromethyl) [(l * S)- l -(2,4,6-trifluorophenoxy)ethyl] -[ l riazo lo- [4,3-a]pyridine; 7-[(l *R)-(2,4-difluorophenoxy)ethyl]propyl—8-(trifluoromethyl)-[ l ,2,4]triazo lo [4,3- a]pyridine; and 7-[(l * S)-(2,4-difluorophenoxy)ethyl]propyl(trifluoromethyl)-[ l ,2,4]triazo lo [4,3- a]pyridine.

Included within the scope of this list are stereoisomeric forms, the pharmaceutically acceptable salts and the solvates f.

In an onal ment, the compound may be ed from 3 -(Cyclopropylmethyl) [(l S)— l -(2,4-difluorophenoxy)ethyl] (trifluoromethyl)[l ,2,4]triazo lo [4,3-a]pyridine hydrochloride salt.

The teric agonists of mGluR2/mGluR2/3 of the combination ofthe invention include, but are not limited to, for example, LY-404039; LY-2969822; LY-2934747; LY-379268; DCG-IV; LY-354740; LY-3l4582; LY-544344; LY—2140023; LY-l 8 l 83 7; LY-3 89795; LY-446433; LY-450477; LY-395756; LY-566332; LY- 541850; LY-2300559; LY-404040; LY-281223; LY-2979165; talaglumetad; MGSOO8; MGSOOZZ; MGSOOZ8; MGSOO39; (-)oxaaminobicyclo[3. l .0]hexane-4,6-dicarboxylate; (+)amino sulfonylbicyclo[3. l .0]hexane-4,6-dicarboxylic acid; (+)aminofluorobicyclo- [3.l.0]hexane-2,6-dicarboxylic acid; lS,2R,5S,6Saminofluorooxobicyclo- [3.l.0]hexane-2,6-dicarboxylic acid; lS,2R,4S,5S,6Saminofluoro hydroxybicyclo[3. l .0]hexane-2,6-dicarboxylic acid; lS,2R,3R,5 S,6Samino fluorobicyclo[3. l .0]hexane-2,6-dicarboxylic acid; lS,2R,3 S,5 S,6Saminofluoro ybicyclo[3. l .0]hexane-2,6-dicarboxylic acid; (+)aminosulfonylbicyclo- [3 . l .0]hexane-4,6-dicarboxylic acid; (+)aminofluorobicyclo[3. l .0]hexane-2,6- dicarboxylic acid; lS,2R,5S,6Saminofluorooxobicyclo[3. l .0]hexane-2,6- dicarboxylic acid; lS,2R,4S,5S,6Saminofluorohydroxybicyclo[3. l .0]hexane- 2,6-dicarboxylic acid; lS,2R,3R,5S,6Saminofluorobicyclo[3. l .0]hexane—2,6- dicarboxylic acid; or lS,2R,3 S,5 S,6Saminofluorohydroxybicyclo- [3 . l .0]hexane-2,6-dicarboxylic acid. 2015/051029 A particular group of mGluR2 agonists include LY-379268; DCG-IV; LY-354740; LY-404039; LY-2969822; LY-2934747; LY-544344; and LY-2140023.

The orthosteric agonists of metabotropic glutamatergic receptor subtype 2 of the combination ofthe invention are in particular further selected from those disclosed in WC 1 997/ 1 8 199 and W02003/104217, incorporated herein in their entirety. Particular nds disclosed therein are (-)-(1R,4S,5S,6S)—4-aminosulfonylbicyclo[3.1.0]- hexane-4,6-dicarboxylic acid (also known as LY-404039) or a salt or a solvate f, and (1R,4S,5S,6S)[[(ZS)amino- hylthio)- 1 tyl]amino] thiabicyclo [3. 1 .0]hexane-4,6-dicarboxylic acid 2,2-dioxide (also known as 0023 [CAS 6353187]) or a salt or a solvate thereof, for example the monohydrate thereof.

The names of the compounds of the present invention were generated according to the nomenclature rules agreed upon by the al Abstracts Service (C.A.S.) using Advanced Chemical Development, Inc., software (ACD/Name product version .01.0.14105, October 2006). In case of tautomeric forms, the name of the depicted tautomeric form of the structure was generated. However it should be clear that the other non-depicted tautomeric form is also included within the scope of the t invention.

As used herein, the notation "C1_3alkyl", "C1_4alkyl" or "C1_6alkyl" as a group or part of a group defines a saturated, straight or branched, hydrocarbon radical having from 1 to 3 or from 1 to 4 or from 1 to 6 carbon atoms, such as methyl, ethyl, l-propyl, l- methylethyl, butyl, l-methylpropyl, 2-methyl-l-propyl, l,l-dimethylethyl, 3-methyl-l- butyl, yl, l-hexyl and the like.

The notation "C3_7cycloalkyl" or "C3_scycloalkyl" as a group or part of a group defines a saturated, cyclic hydrocarbon radical having from 3 to 7 or from 3 to 8 carbon atoms, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl.

The notation "halo" or "halogen" as used herein as a group or part of a group refers to fluoro, chloro, bromo or iodo, with fluoro or chloro being preferred.

The notation "mono- and polyhaloC1_3alkyl" or "mono- and polyhaloC1_4alkyl" shall denote C1_3alkyl or C1_4alkyl respectively, as defined before, substituted with l, 2, 3 or where possible with more halo atoms as defined before.

Whenever the term "substituted" is used in the t ion, it is meant, unless otherwise is indicated or is clear from the context, to indicate that one or more hydrogens, preferably from 1 to 3 ens, more preferably from 1 to 2 hydrogens, more preferably 1 hydrogen, on the atom or l indicated in the expression using "substituted" are replaced with a selection from the indicated group, provided that the normal valency is not exceeded, and that the substitution results in a chemically stable compound, i.e. a compound that is sufficiently robust to survive isolation to a useful degree of purity from a reaction mixture, and formulation into a therapeutic agent.

As used herein, unless otherwise noted, the term "antiepileptic agent" and the abbreviation "AED" will be used interchangeably with the term "anticonvulsant , and as used herein, refer to an agent capable of treating, inhibiting or preventing seizure activity or ictogenesis when the agent is stered to a subject or As used herein, unless otherwise noted, the term "synaptic vesicle protein 2A ligand" and the abbreviation "SVZA ligand" will be used interchangeably. Examples of SV2A ligands include, but are not limited to, the compounds ed in the ations GB 1,039,113; GB 1,309,692; EP 1 262 036; EP 1 806 339; ; US 2002/094787; ; ; WO 54188; WO 2006/128692; ; WO 65595; , and WO 2008/132142; ; ; and . Suitable particular examples of SVZA ligands include, but are not limited to: levetiracetam, brivaracetam and seletracetam.

Therefore, in an embodiment ofthe invention, the SVZA ligand is selected from levetiracetam, brivaracetam and seletracetam.

In a particular embodiment, the SVZA ligand is levetiracetam.

In a particular embodiment, the SVZA ligand is brivaracetam. ses for the preparation of the above SVZA ligands are known from the literature and described for instance in EP 1 806 339; in EP 0 162 036 and in GB 2 225 322 (levetiracetam); in WO 01/62726 (brivaracetam); and in WC 2005/121082 racetam); such processes are hereby incorporated by reference in their ty.

In an additional embodiment, the combination according to the invention comprises (a) a SVZA ligand ed from levetiracetam or brivaracetam; and (b) F {\N / /N\ QV N \ "R F Co. No. l or a pharmaceutically acceptable salt thereof, preferably a hydrochloride salt thereof, or a solvate thereof.

In an additional embodiment, the pharmaceutical composition according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or acetam; and (b) a pharmaceutically effective amount of F N / /N\ F Co. No. l or a pharmaceutically acceptable salt f, preferably a hydrochloride salt thereof, or a solvate thereof In an additional embodiment, the combination according to the invention comprises (a) a ceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically effective amount of (Co. No. 2-a) or a pharmaceutically acceptable salt, or a solvate thereof In an additional embodiment, the ceutical composition according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically ive amount of (Co. No. 2-a) or a pharmaceutically acceptable salt, or a solvate thereof In an additional embodiment, the combination according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or acetam; and (b) a pharmaceutically effective amount of F (Co. No. 25-a) or a pharmaceutically acceptable salt, or a solvate thereof In an additional embodiment, the ceutical composition according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or brivaracetam; and (b) a ceutically effective amount of F (Co. No. 25-a) or a pharmaceutically acceptable salt, or a e thereof In an additional embodiment, the combination according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically effective amount of (Co. No. 6-b) or a pharmaceutically acceptable salt thereof in particular the hloride salt f, or a solvate thereof In an additional embodiment, the pharmaceutical composition according to the invention comprises (a) a ceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically effective amount of F N’N>_)> (Co. No. 6-b) or a pharmaceutically acceptable salt thereof, in particular the hydrochloride salt thereof, or a solvate thereof In an additional embodiment, the combination according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically effective amount of 039 or a pharmaceutically acceptable salt thereof, in particular the hydrochloride salt f, or a solvate thereof.

In an additional embodiment, the pharmaceutical composition according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically effective amount ofLY—404039 or a pharmaceutically acceptable salt thereof, in particular the hydrochloride salt thereof, or a solvate thereof.

In an additional embodiment, the combination ing to the invention ses (a) a pharmaceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically effective amount of LY-2140023 or a pharmaceutically acceptable salt or a e thereof, in particular the monohydrate thereof In an additional embodiment, the pharmaceutical composition according to the invention comprises (a) a pharmaceutically effective amount of levetiracetam or brivaracetam; and (b) a pharmaceutically effective amount of 0023 or a pharmaceutically acceptable salt or a solvate thereof, in particular the monohydrate thereof The combination product ofthe present invention, in particular, the pharmaceutical composition according to the invention, is ally appropriate for the treatment of epilepsy and related disorders.

It will be appreciated that some of the mGluR2 compounds, in particular the mGluR2 PAM/agonist compounds of the invention and their pharmaceutically acceptable addition salts and solvates thereofmay contain one or more centres of ity and exist as stereoisomeric forms.

The term "compounds of the invention" as used herein, is meant to include the mGluR2 PAM compounds, in particular the compounds of Formula (I)/(I-A)/(I-B), and the mGluR2 agonist compounds as disclosed herein, and the salts and solvates thereof As used herein, any chemical formula with bonds shown only as solid lines and not as solid wedged or hashed wedged bonds, or otherwise indicated as having a particular uration (e. g. R, S) around one or more atoms, contemplates each possible 3O stereoisomer, or e of two or more stereoisomers.

Hereinbefore and hereinafter, the terms "mGluR2 compound" and 2 PAM/agonist compound" are meant to e the isomers thereof and the 2015/051029 tautomeric forms thereof. The terms "stereoisomers", "stereoisomeric forms" or "stereochemically isomeric forms" hereinbefore or hereinafter are used interchangeably. The invention includes all stereoisomers of the compounds of the invention either as a pure stereoisomer or as a mixture of two or more stereoisomers.

Enantiomers are isomers that are non-superimposable mirror images of each other. A 1:1 mixture of a pair of enantiomers is a racemate or racemic mixture.

Diastereomers (or diastereoisomers) are stereoisomers that are not enantiomers, i.e. they are not related as mirror images. If a nd ns a double bond, the substituents may be in the E or the Z configuration. Substituents on bivalent cyclic (partially) saturated radicals may have either the cis- or trans-configuration; for e if a compound contains a disubstituted cycloalkyl group, the substituents may be in the cis or trans configuration. Therefore, the invention includes enantiomers, diastereomers, racemates, E isomers, Z isomers, cis isomers, trans isomers and mixtures thereof, er chemically possible. The meaning of all those terms, i.e. enantiomers, diastereomers, tes, E s, Z s, cis isomers, trans isomers and mixtures f are known to the skilled person. The absolute configuration is specified according to the Cahn-Ingold-Prelog system. The configuration at an asymmetric atom is specified by either R or S. Resolved stereoisomers whose absolute configuration is not known can be designated by (+) or (-) depending on the direction in which they rotate plane polarized light. For instance, resolved enantiomers whose absolute configuration is not known can be designated by (+) or (-) depending on the direction in which they rotate plane polarized light.

When a specific stereoisomer is identified, this means that said stereoisomer is substantially free, i.e. associated with less than 50%, preferably less than 20%, more preferably less than 10%, even more preferably less than 5%, in particular less than 2% and most preferably less than 1%, of the other isomers. Thus, when a mGluR2 compound is for ce specified as (R), this means that the compound is substantially fiee of the (S) isomer; when a mGluR2 nd is for instance specified as E, this means that the nd is substantially free of the Z isomer; when a mGluR2 compound is for instance specified as cis, this means that the compound is substantially fiee of the trans isomer.

Some ofthe mGluR2 compounds may also exist in their tautomeric form. Such forms in so far as they may exist, although not explicitly indicated in the above formula are intended to be included within the scope of the present invention.

It follows that a single compound may exist in both stereisomeric and tautomeric forms.

For use in ne, the salts of the compounds of this invention refer to non-toxic "pharmaceutically acceptable salts" (salts ofthe compounds of the present invention wherein the counterion is pharmaceutically acceptable). Other salts may, however, be useful in the preparation or purification of compounds according to this invention or of their pharmaceutically acceptable salts, and may encompass acids and bases which are armaceutically able. All salts, whether pharmaceutically acceptable or not, are included within the ambit of the present invention.

The pharmaceutically acceptable acid and base addition salts as mentioned above or hereinafter are meant to comprise the therapeutically active non-toxic acid and base addition salt forms which the compounds of the invention are able to form. Suitable pharmaceutically acceptable salts of the compounds include acid addition salts which may, for e, be formed by mixing a solution ofthe compound with a on of a pharmaceutically acceptable acid such as for example, nic acids such as alic acids, e. g. hydrochloric or hydrobromic acid, sulfuric, nitric, phosphoric and the like acids; or organic acids such as, for example, acetic, propanoic, hydroxyacetic, , pyruvic, oxalic (i.e. ethanedioic), malonic, succinic (i.e. butanedioic acid), maleic, fumaric, malic, tartaric, citric, esulfonic, ethanesulfonic, benzenesulfonic, p-toluenesulfonic, cyclamic, salicylic, p-aminosalicylic, pamoic and the like acids. Conversely, said salt forms can be converted by treatment with an appropriate base into the free base form. Furthermore, where the compounds of the invention carry an acidic moiety, le pharmaceutically acceptable salts thereof may include organic and inorganic bases. Appropriate base salt forms comprise, for example, the ammonium salts, the alkali and alkaline earth metal salts, e.g. the lithium, sodium, potassium, magnesium, calcium salts and the like, salts with organic bases, e.g. primary, secondary and tertiary aliphatic and aromatic amines such as methylamine, ethylamine, amine, isopropylamine, the four butylamine isomers, dimethylamine, diethylamine, diethanolamine, dipropylamine, diisopropylamine, di-n-butylamine, pyrrolidine, piperidine, line, hylamine, triethylamine, tripropylamine, quinuclidine, pyridine, quino line and isoquino line; the benzathine, N—methyl-D-glucamine, hydrabamine salts, and salts with amino acids such as, for example, ne, lysine and the like. Conversely, the salt form can be converted by treatment with acid into the free acid form.

The term "solvate" comprises the solvent addition forms as well as the salts thereof, which the compounds of Formula (I) are able to form. es of such solvent addition forms are e.g. hydrates, alcoholates and the like.

Preparation of the compounds of Formula (I-B) The compounds of Formula (I-B) according to the invention can generally be prepared by a succession of steps, each of which is known to the skilled person. In particular, the compounds can be prepared according to the following synthesis methods.

The compounds of Formula (I-B) may be synthesized in the form of racemic es of enantiomers which can be separated from one another following art-known resolution procedures. The c compounds of Formula (I-B) may be ted into the corresponding diastereomeric salt forms by on with a suitable chiral acid.

Said diastereomeric salt forms are subsequently separated, for example, by selective or fractional crystallization and the enantiomers are liberated therefrom by alkali. An alternative manner of separating the enantiomeric forms of the compounds of Formula (I-B) es liquid tography or supercritical fluid chromatography (SFC) using a chiral stationary phase. Said pure stereochemically isomeric forms may also be derived from the corresponding pure stereochemically isomeric forms of the appropriate starting materials, provided that the reaction occurs stereospecifically.

A. Preparation ofthe final compounds of Formula (I-B) Final compounds according to Formula (I-B), can be prepared by reacting an intermediate compound of Formula (II) with a compound of Formula (111) according to reaction scheme (1), a reaction that is performed under classical Mitsunobu ions.

The on is preferably conducted with a phosphine and an azodicarboxylic ester or amide in tetrahydrofuran, l,4-dioxane, diethyl ether, e, e, romethane, or mixtures thereof, at -30 to 150°C, under thermal g or microwave irradiation. Phosphines often used are triphenylphosphine and tributylphosphine which are usually combined with dimethyl azodicarboxylate, diethyl 3O azodicarboxylate, diisopropyl azodicarboxylate, di-(4-chlorobenzyl) azodicarboxylate, dibenzyl azodicarboxylate, di-tert-butyl azodicarboxylate, azodicarboxylic acid bis- (dimethyylamide), azodicarboxylic acid dipiperidide, or azodicarboxylic acid dimorpholide. In reaction scheme (1), all variables are as defined in Formula (I-B) 2015/051029 Reaction Scheme 1 F N4:/ F R1 (fig 7—\N 1 (III) F N B. Preparation of the intermediates Experimental procedure 2 Intermediate compounds according to Formula (II) can be prepared by subjecting an ediate of Formula (IV) to conditions that are known to those d in the art. This is illustrated in reaction scheme (2) wherein all variables are defined as mentioned hereinabove. Methods lishing these transformations are well known to those skilled in the art. Treatment of the aldehyde of formula (IV) with an organometallic such as methyl lithium or methyl magnesium bromide gives a nd of formula (II). A le solvent for this reaction is an ether such as tetrahydrofuran and the reaction is y carried out at a temperature between -78°C and 40°C. In reaction scheme (2), all variables are defined as in Formula (I-B).

Reaction Scheme 2 F N—N F 7') : /NB*\€ 1 MeMgX F N>\R | l ——> H0 O / (IV) (In mental procedure 3 Intermediate compounds according to Formula (IV) can be prepared by reacting an intermediate of Formula (V) under dihydroxylation and oxidative cleavage conditions that are known to those skilled in the art and can be realized for example with oxone, osmium tetroxide. The process may be carried out optionally in a solvent such as l,4-dioxane, water and generally at temperatures between about -lOO°C and about 100°C. A summary of such methods is found in "Comprehensive Organic Transformations", VCH Publishers, (1989), R.C.Larock, pp.595-596. This is illustrated in reaction scheme (3) wherein all variables are defined as mentioned above.

Reaction Scheme 3 1 F N4: R / 1 F N ——> O / (V) H (IV) mental procedure 4 Intermediate compounds according to Formula (V) can be prepared by coupling reactions, such as Stille or Suzuki reactions of an intermediate of Formula (VI) with a compound of Formula (VII) under conditions that are known to those skilled in the art.

The process may be carried out optionally in a solvent such as l,4-dioxane, water and generally at temperatures between about r.t. and about 200°C in the presence of a base.

This is illustrated in reaction scheme (4) wherein all variables are defined as mentioned hereabove, wherein M is trialkyltin, boronic acid or boronate ester, and a palladium catalyst and halo is chloro, bromo or iodo.

Reaction Scheme 4 F N~N WM F / >\R1 F N | (VII) halo Palladium catalyst (VI) M mental procedure 5 Intermediate compounds according to Formula (VI) can be prepared following art known ures by cyclization of an intermediate compound of Formula (VIII) in the ce of a halogenating agent such as for example phosphorus (V) oxychloride (POClg) in a suitable solvent such as, for example, roethane, stirred under microwave irradiation, for a suitable period oftime that allows the completion of the reaction, as for example 5 min at a ature between 140-200 0C. In on scheme (5), R1 is defined as in Formula (LB) and halo is chloro, bromo or iodo.

Reaction Scheme 5 /NH F N~N F HN F / >\R1 F N F \N | ’ l 0 / halo (VIII) (VI) Experimental ure 6 Intermediate compounds according to Formula (VIII) can be prepared by art known procedures by reaction of a hydrazine intermediate of Formula (IX) with acid halides of Formula (X). The reaction can be carried out using an inert-solvent, such as for example DCM, in the presence of a base such as for example triethylamine, for example at r.t. for a suitable period of time that allows completion of the reaction, for example 20 min. In reaction scheme (6), R1 is defined as in Formula (I-B).

Reaction Scheme 6 F HN/ RQLCI F HN’ F \ N I F \ N GAO / GAO / (VIII) Experimental procedure 7 Intermediate compounds according to Formula (IX) can be prepared by ng an ediate compound of Formula (XI) with hydrazine according to reaction scheme (7), a reaction that is performed in a suitable reaction-inert solvent, such as, for example, ethanol, THF or oxane under thermal conditions such as, for example, heating the reaction mixture for example at 160 0C under microwave ation for 30 min or classical thermal g at 70°C for 16 h. In reaction scheme (7), halo is chloro, bromo or iodo.

Reaction Scheme 7 F hmo F F HN/NH2 | :N —_,N2H4 F \N ©/\O I (X) ©/\O (IX) Experimental ure 8 Intermediate compounds according to Formula (XI) can be prepared by reacting an intermediate nd of Formula (XII) with benzyl alcohol according to reaction scheme (8), a reaction that is performed in a suitable reaction-inert solvent, such as, for example, N,N—dimethylformamide in the presence of a suitable base, such as for example sodium hydride at r.t. for a suitable period of time that allows the completion IO ofthe reaction, such as for example 1 h. In reaction scheme (8), halo is chloro, bromo or iodo.

Reaction Scheme 8 halo (XII) GAO (XI) Experimental procedure 9 Intermediate compounds of Formula (XII), can be prepared by reacting an ediate of Formula (XIII), with a suitable trifluoromethylating agent, such as for example fluorosulfonyl(difluoro)acetic acid methyl ester, according to reaction scheme (9). This reaction is performed in a suitable reaction-inert solvent such as, for example, N,N-dimethylformamide in the presence of a suitable coupling agent such as for example, copper(I) iodide, under thermal ions such as, for example, heating the reaction mixture for e at 160 0C under microwave irradiation for 45 min. In reaction scheme (9), halo is chloro, bromo or iodo.

Reaction Scheme 9 O 0 halo O‘ShJLo/F n ‘ F halo I F \ N F I F F \ N (XIII) (XII) The starting materials according to Formulae (11), (VII), (X) or (XIII) are compounds that are either cially available or may be prepared according to conventional reaction procedures generally known to those d in the art.

As used herein, the term "composition" is intended to encompass a product comprising the specified ingredients in the specified amounts, as well as any product which results, directly or indirectly, fiom combinations of the specified ingredients in the specified amounts .

As used herein, the term "subject" refers to an animal, preferably a mammal, most preferably a human adult, child or infant, who is or has been the object of treatment, observation or experiment.

The term "therapeutically effective " as used herein, means that amount of active compound or pharmaceutical agent that elicits the biological or medicinal response in a tissue system, animal or human that is being sought by a researcher, veterinarian, medical doctor or other clinician, which includes ation of one or more ofthe symptoms ofthe disease or disorder being treated; and/or reduction of the severity of one or more of the symptoms of the disease being treated.

The combination of compounds (a) SVZA ligand and (b) positive allosteric modulator ) ofmetabotropic glutamatergic receptor subtype 2 ("mGluRZ") or a pharmaceutically acceptable salt or a solvate f, or teric agonist of metabotropic glutamatergic receptor e 2 or a pharmaceutically acceptable salt or a solvate f, whether the compounds (a) and (b) are given simultaneously, separately or sequentially, may be beneficial compared to the effect of the nds (a) or (b) administered alone. In particular, there may be at least one beneficial , e. g. a mutual enhancement of the effect of the nds (a) and (b), a more than additive effect, in particular a synergic ; additional advantageous effects, include for example, a significantly reduced effective dose for the combination of (a) and (b); a further therapeutic effect not observed for any ofthe compounds (a) or (b) alone, a more beneficial side effect profile, or a combined therapeutic effect in a fective dosage of one or both of (a) and (b).

As defined herein, the term dose ratio of (a) ic vesicle protein 2A ligand to (b) compound of Formula (I) of 1:1, calculated on the ED50 values of the individual compounds (a) and (b)" refers to compositions comprising compounds (a) and (b) in a dose corresponding to 50% of the respective ED50 dose of the individual compounds (a) and (b) or a multiple of this fixed-dose ratio. The term "fixed-dose ratio of (a) synaptic vesicle protein 2A ligand : (b) compound of Formula (I) of 3:1, calculated on the ED50 values of the individual compounds (a) and (b)" refers to compositions comprising (b) the nd of Formula (I) in a dose corresponding to 75% ofthe respective ED50 dose and compound (a) in a dose corresponding to 25% of the respective ED50 dose of nd (a) or a multiple of this fixed-dose ratio, and so 011.

Thus, in another embodiment ofthe invention, (a) the SVZA ligand and (b) the compound of Formula (I) are present in the pharmaceutical composition in a fixed-dose ratio of (a):(b) of about 1:10 to about 10:1, preferably about 1:5 to about 5:1, more preferably about 1:3 to about 3:1, in another embodiment of about 1:1 to about 3:1; in an alternate embodiment of 1 :3; in yet another embodiment of 1 :1; further embodiment of 3 : 1; wherein the fixed-dose ratio is ated on the ED50 values of the individual compounds (a) and (b).

Wherein the present invention is directed to co-therapy or combination y, sing administration of (a) synaptic vesicle protein 2A ("SVZA") ligand; and (b) a mGluR2 onist compound, in particular a compound of Formula (I)/(I-A)/(I— B) as defined herein, pharmaceutically or therapeutically effective amount shall mean that amount of the combination of agents taken together so that the combined effect elicits the desired biological or medicinal response. For example, the therapeutically effective amount of co-therapy comprising administration of (a) a SVZA ligand as defined herein and (b) a mGluR2 PAM/agonist compound, in ular a compound of Formula (I)/(I-A)/(I-B) as defined herein would be the amount of the (a) a SVZA ligand as defined herein and the amount of (b) a mGluR2 PAM/agonist compound, in particular compound of Formula (I)/(I-A)/(I-B) that when taken together or sequentially have a ed effect that is therapeutically effective. Further, it will be recognized by one skilled in the art that in the case of co-therapy with a eutically effective , as in the example above, the amount of the mGluR2 PAM/agonist compound, WO 10435 in particular the compound of Formula (I)/(I-A)/(I-B), and/or the amount of the le SV2A ligand individually may or may not be therapeutically effective.

The present invention provides methods of prevention or treatment comprising administering to a subject in need thereof, co-therapy with a therapeutically effective amount of a SV2A ligand and a therapeutically ive amount of a mGluR2 PAM/agonist compound, in particular a compound of formula (I)/(I-A)/(I-B), as described herein. In order to accomplish this ive the compounds or itions ofthis invention must be used in the correct therapeutically effective amount or dose, as described below.

Optimal dosages and schedules to be administered may be readily determined by those skilled in the art, and will vary with the particular compound used, the mode of administration, the strength of the preparation, the mode of administration, and the advancement ofthe disease condition. In addition, factors associated with the particular patient being treated, including patient age, weight, diet and time of administration, will result in the need to adjust dosages.

One skilled in the art will recognize that a therapeutically effective dosage of the compounds of the present invention can include repeated doses within a ged treatment regimen that will yield ally significant results.

The amounts of the mGluR2 PAM/agonist nd, in ular of the compound of Formula (I)/(I-A)/(I-B), in the combinations of the invention that are administered on a daily basis may vary from about 0.01 to about 2000 mg. Examples of daily amounts of the compound ofFormula (I)/(I-A)/(I-B) are 0.01, 0.05, 0.1, 0.5, 1.0, 2.5, 5.0, 10.0, 15.0, .0, 50.0, 100, 150, 200, 250, 300, 400, 500, 750 and 1000 milligrams for the matic adjustment ofthe dosage to the patient to be treated. An ive amount of the drug is ordinarily supplied at a dosage level of from about 0.01 mg/kg to about 150.0 mg/kg ofbody weight per day or any range n. Preferably, the range is from about 0.1 to about 100.0 mg/kg ofbody weight per day, more preferably, from about 0.5 mg/kg to about 50 mg/kg, more preferably, from about 1.0 to about 25.0 mg/kg ofbody weight per day. The compounds may be administered on a regimen of l, 2, 3 or 4 times per day.

The amounts of SV2A ligand that are administered on a daily basis may vary from about 0.01 to about 7000 mg, preferably will be between 250 and 5000 mg and more preferably will be between 500 and 3000 mg. Examples of daily amount of the SV2A ligand are 2.5, 5.0, 10.0, 15.0, 25.0, 50.0, 100, 150, 200, 250, 500, 750, 1000, 1500 and 3000 milligrams for the symptomatic adjustment of the dosage of the patient to be treated. An effective amount ofthe drug is ordinarily supplied at a dosage level of from about 0.01 mg/kg to about 150.0 mg/kg ofbody weight per day or any range therein.

Preferably, the range is from about 0.1 to about 100.0 mg/kg ofbody weight per day, more ably, from about 0.5 mg/kg to about 50 mg/kg, more preferably, from about 1.0 to about 25.0 mg/kg ofbody weight per day. The compounds may be administered on a regimen of l, 2, 3 or 4 times per day. All amounts ned in this and the following paragraphs refer to the free form (i.e. non-salt form). The above values represent free- form equivalents, i.e. quantities as if the free form would be administered. If salts are administered the amounts need to be calculated in function of the molecular weight ratio between the salt and the free form.

The above ned daily doses are calculated for an average body weight of about 70 kg and should be recalculated in case of paediatric applications, or when used with patients with a substantially diverting body weight.

The dosages may be presented as one, two, three or four or more sub-doses administered at appropriate intervals throughout the day. The dosage used preferably corresponds to the daily amount of the mGluR2 PAM/agonist compound, in particular ofthe compound of Formula -A)/(I-B), or of the SV2A ligand, mentioned above, or a sub-dose thereof, such as l/2, U3, U4 thereof. A dosage form may n the mGluR2 onist compound, in particular the compound -A)/(I-B), or the SVZA ligand or both together, in an amount equal to the ranges or quantities ned in the previous paragraphs, for example a dosage form may contain 10 mg, 25 mg, 50 mg, 100 mg, 150 mg, or 200 mg ofmGluR2 PAM/agonist compound, in particular of compound (I)/(I-A)/(I-B), 10 mg, 25 mg, 50 mg, 100 mg or 250 mg, of SV2A ligand, either in separate formulations or in a ed formulation. In one embodiment, the mGluR2 onist compound, in particular the nd of Formula (I)/(I-A)/(I- B), is administered once daily (q.d.), in particular as one dose per day, and the SV2A ligand is administered once or twice daily (q.d. or b.i.d.), in particular as one or as two doses per day. In the instance where both compounds are to be administered once daily, this can be accomplished by administering two separate doses, one with the mGluR2 PAM/agonist compound, in particular the compound of Formula (I)/(I-A)/(I- B), one with the SV2A ligand, or by administering a combined dose containing the mGluR2 PAM/agonist compound, in particular the compound of Formula (I)/(I-A)/(I- B), and SV2A ligand.

The combinations of the invention may be administered once, twice, three, four, or if desired, multiple times daily. In one embodiment, the combination is administered once daily. In another embodiment, the combination is administered twice daily, or three times per day. Administration of dosages may be by separate dosage forms, i.e. dosage forms only containing mGluR2 PAM/agonist compound, in particular nd of Formula (I)/(I-A)/(I-B), or only SV2A ligand; or by combined dosage forms containing active ingredients mGluR2 PAM/agonist nd, in ular compound of Formula (I)/(I-A)/(I-B), and SV2A ligand. Also, a mix of using a combined dosage form and separate dosage forms can be used. Dosage forms that can be administered are described hereinafter, oral dosage forms, in particular tablets or capsules being preferred.

Active ingredients may be formulated in pharmaceutical compositions either separately or as a combined pharmaceutical composition. In the latter instance, there is ed a pharmaceutical composition comprising a eutically effective amount of the mGluR2 PAM/agonist compound, in particular of the nd of Formula (I)/(I- A)/(I-B), or a pharmaceutically acceptable salt thereof, and the SV2A ligand, the foregoing being as specified herein, and a pharmaceutically able carrier.

In a r aspect, this invention relates to a process for preparing a pharmaceutical composition as specified , which ses intimately mixing a ceutically acceptable carrier with a therapeutically effective amount of the mGluR2 PAM/agonist compound, in particular of the compound of a (I)/(I-A)/(I-B), or a pharmaceutically acceptable salt or a solvate thereof, and a therapeutically effective amount of at least one SVZA ligand.

The combinations provided herein may also be formulated as a combined preparation for simultaneous, separate or sequential use in the prevention or treatment of sy and related disorders; neuropathic pain; migraine or resistant headache; r and related disorders; in neuroprotection; or in the prevention of epileptogenesis. In such a case, the mGluR2 onist compound, in particular the compound of Formula (I)/(I-A)/(I-B), is formulated in a pharmaceutical composition containing other pharmaceutically acceptable excipients, and the SV2A ligand is formulated separately in a pharmaceutical composition containing other pharmaceutically acceptable excipients. Conveniently, these separate pharmaceutical compositions can be part of a 3O kit for simultaneous, separate, or sequential use.

The individual components of the combination of the present invention can be administered simultaneously or separately at different times during the course of therapy or concurrently in divided or single combination forms.

WO 10435 Therefore, the mGluR2 PAM/agonist compounds, in particular the nds of Formula (I)/(I-A)/(I-B), and the SVZA ligand, individually or combined, may be formulated into various pharmaceutical compositions le for administration purposes. In these, a therapeutically effective amount of the particular compound, or of both two compounds, is combined with a pharmaceutically acceptable carrier, which carrier may take a wide variety of forms depending on the form of ation desired for administration. Pharmaceutical compositions may be prepared as medicaments to be administered orally, parenterally (including subcutaneously (s.c.), intramuscularly (i.m.), and intravenously (i.v.)), rectally, transdermally, bucally, or nasally. The pharmaceutical compositions may also be prepared to be administered directly to the nervous system by routes including, but not limited to, intracerebral, entricular, intracerebroventricular, intrathecal, intracisternal, intraspinal and/or peri—spinal route by delivery via intracranial or intravertebral needles and/or catheters with or without pump devices. Suitable compositions for oral administration include powders, granulates, aggregates, tablets, ssed or coated pills, dragees, s, hard or gelatin capsules, syrups and suspensions. Suitable compositions for parenteral administration include aqueous or non-aqueous solutions or emulsions, while for rectal administration suitable compositions for administration include suppositories with a hilic or hydrophobic vehicle. For topical administration suitable transdermal ry systems can be used and for nasal delivery suitable aerosol delivery systems can be used.

For example, in ing the compositions for oral administration, any of the usual ceutical media may be employed such as, for example, water, glycols, oils, alcohols and the like in the case of oral liquid compositions such as suspensions, syrups, elixirs, emulsions and solutions; or solid carriers such as es, sugars, kaolin, lubricants, binders, disintegrating agents and the like in the case of solid itions. For parenteral compositions, the carrier will usually comprise sterile water, at least in large part, though other ingredients, such as solubilizers, emulsifiers or further auxiliaries may be added thereto. Inj ectable solutions may be prepared in which 3O the carrier comprises saline solution, glucose on or a mixture of both. able suspensions may also be ed in which case appropriate liquid carriers, suspending agents and the like may be employed. Also included are solid form preparations intended to be converted, y before use, to liquid form preparations such as powders for reconstitution. In the compositions suitable for percutaneous administration, the carrier optionally comprises a skin penetration enhancing agent and/or a wetting agent, ally combined with suitable skin-compatible additives in minor tions. The mGluR2 onist compound, in particular the compound of Formula (I)/(I-A)/(I-B), or SV2A ligand, or combinations thereof, may also be administered via oral inhalation or insufflation by formulations suited for this type of administration such as a solution, a suspension or a dry powder. Suitable pharmaceutical compositions for administration in the form of aerosols or sprays are, for example, suspensions of the mGluR2 PAM/agonist compound, in particular of the compound ofFormula (I)/(I-A)/(I-B), or SV2A , or both, in a pharmaceutically acceptable liquid carrier, such as ethanol or water, or a mixture thereof. If required, the formulation can also additionally contain other pharmaceutical auxiliaries such as surfactants, fiers and stabilizers as well as a propellant. Such a preparation customarily ns the active compound in a concentration from approximately 0.1 to 50%, in particular from approximately 0.3 to 3% by weight.

The pharmaceutical compositions may contain the active ingredient mGluR2 PAM/agonist compound, in ular compound of Formula (I)/(I-A)/(I-B), or the SV2A ligand, or both combined in a concentration of about 0.1% to about 50%, or about 1% to about 30%, or about 3% to about 20%, or about 5% to about 20%, all percentages being by weight, wherein the total of all components in said ceutical compositions does not exceed 100%. In the compositions containing both two compounds mGluR2 PAM/agonist compound, in particular compound of a (I)/(I-A)/(I-B), and SV2A ligand, the mGluR2 PAM/agonist compound, in particular the nd of Formula (I)/(I-A)/(I-B), is present in a concentration of about 0.1% to about 50%, or about 1% to about 30%, or about 3% to about 20%, or about 5% to about 20%; and the SV2A ligand is t in a concentration of about 3% to about 50%, or about 5% to about 50%, or about 10% to about 50%, or about 10% to about 40%, or about 10% to about 30%, n the total of all components in said pharmaceutical compositions does not exceed 100%.

The pharmaceutical itions may be conveniently presented in unit dosage form for ease of administration and uniformity of dosage. Examples include tablets ding scored or coated tablets), capsules, pills, suppositories, powder packets, wafers, injectable solutions or suspensions and the like, and segregated multiples thereof. Of interest are solid dosage forms for oral administration such as tablets or capsules.

The solid dosage forms in unit dose form may be packed in any known package, blister packs being preferred, in particular for tablets and capsules. Where the mGluR2 PAM/agonist compound, in particular the compound of Formula (I)/(I-A)/(I-B), and SVZA ligand are ated separately, they could be packed in separate blisters, but one blister could as well comprise unit dose forms of the mGluR2 onist compound, in particular of the compound of a (I)/(I-A)/(I-B), and of the SVZA ligand, for example one row with units of mGluR2 PAM/agonist compound, in particular of compound of a (I)/(I-A)/(I-B), and another with SVZA ligand.

Other possibilities may be le as well.

The combinations of this invention may be used to treat or prevent epilepsy and related disorders; neuropathic pain; ne or resistant headache; and bipolar and related disorders; or they may be used as a neuroprotectant or to prevent epileptogenesis.

As used , the term "treatment" is intended to refer to all processes, wherein there may be a slowing, upting, arresting or stopping of the progression of a disease or an alleviation of symptoms, but does not necessarily indicate a total elimination of all symptoms As used herein, unless otherwise noted, the terms "epilepsy and d disorders" or psy or related er" shall mean any disorder in which a subject (preferably a human adult, child or infant) experiences one or more seizures and / or tremors.

Suitable examples include, but are not limited to, epilepsy (including, but not limited to, localization-related epilepsies, generalized epilepsies, epilepsies with both generalized and local es, and the like), partial-onset seizures with or without generalization, myoclonic seizures, primary generalized tonic-clonic seizures in particular in patients with idiopathic generalized epilepsy, seizures associated with Lennox-Gastaut syndrome, seizures as a complication of a disease or condition (such as seizures associated with encephalopathy, phenylketonuria, juvenile Gaucher’s disease, Lundborg’s progressive myoclonic epilepsy, stroke, head trauma, stress, al changes, drug use or withdrawal, alcohol use or withdrawal, sleep deprivation, fever, infection, and the like), status epilepticus lsive or non convulsive), essential tremor, restless limb syndrome, and the like. Preferably, the er is selected from epilepsy dless of type, underlying cause or origin), essential tremor or restless limb syndrome. More preferably, the disorder is epilepsy (regardless of type, 3O underlying cause or origin) or essential tremor. A particular example of epilepsy is tory epilepsy, also referred to as treatment or therapy resistant epilepsy. This term is often used when ts have failed three or more anti-epileptic drugs (AEDs).

Refractory epilepsy also includes refractory partial epilepsy and refractory generalized epilepsy (including idiopathic or symptomatic).

WO 10435 As used herein, the term "neuropathic pain" es pain ing from chronic or debilitating conditions or disorders. The chronic or debilitating ions or ers which can lead to neuropathic pain include, but are not limited to, painful diabetic peripheral neuropathy, erpetic neuralgia, trigeminal neuralgia, post-stroke pain, multiple sclerosis-associated pain, neuropathies-associated pain such as in idiopathic or post-traumatic neuropathy and mononeuritis, HIV-associated neuropathic pain, cancer- associated neuropathic pain, carpal tunnel-associated neuropathic pain, spinal cord injury-associated pain, complex regional pain syndrome, fibromyalgia-associated neuropathic pain, lumbar and cervical pain, reflex sympathic dystrophy, phantom limb syndrome and other chronic and debilitating condition-associated pain mes.

As used herein, the term "migraine" shall mean a chronic, episodic and debilitating clinical condition that is sed by the presence of moderate to severe pulsating unilateral headaches lasting between 4 and 72 h, which includes ne without aura and migraine with aura. As used herein, ine without aura" shall mean at least five attacks fulfilling the following criteria: (a) the headache attack lasts 4-72 hours with the headache having at least two of the following features: unilateral location, pulsating y, moderate or severe ity with direct influence on activities of daily living, and aggravation by walking up stairs or similar routines: and (b) during the headache at least one of the following occurs: nausea and/or vomiting, and photophobia and phonophobia. As used , "migraine with aura" shall mean at least two attacks accompanied by at least 3 of the 4 following features: (a) one or more fully reversible aura symptoms: (b) at least one aura symptom which develops gradually over more than four minutes or two or more symptoms which occur in succession; (c) no aura symptom which lasts more than 60 s; (d) a he occurs prior to, simultaneously with or following the aura, with a free interval between aura and he of less than about 60 minutes.

As used herein, the term "bipolar and related disorders" shall include bipolar disorder I (e.g. single manic episode, most recent episode hypomanic, most recent episode manic, most recent episode mixed, most recent episode depressed and most recent e unspecified), bipolar disorder 11, cyclothymic disorder and bipolar disorder not otherwise specified (as these terms are defined by their diagnostic criteria, in the stic and Statistical manual of Mental Disorders 4th Edition, Text Revision, American Psychiatric Association, 2000 (DSM-IV-TR) or in the 5th Edition, Text Revision, American Psychiatric Association, 2013 (DSM-STM). Preferably, the bipolar disorder is characterized by depressive and manic (or hypomanic) phases, wherein the phases cycle. Preferably, the bipolar disorder is bipolar disorder I or bipolar disorder 11. As used herein "mania" shall include mania or a manic mood phase, regardless rlying cause. As used herein, the term "bipolar mania" is intended to mean the mania associated with, characteristic of or symptomatic of a bipolar disorder. Thus, methods of ng bipolar mania of the present invention are directed to methods which treat the mania and/or manic phase ofbipolar disorders. As used herein, the term ar depression" is intended to mean the depression ated with, characteristic of or symptomatic of a bipolar disorder. Thus, methods ting bipolar depression of the present invention are directed to methods which treat the depression and/or depressed phase of bipolar disorders. As used herein, unless otherwise noted the terms "cycling" or "bipolar cycling" shall refer to the alteration of mood between depressive and manic phases teristic of bipolar disorders. Thus, the present ion includes methods for the stabilization of said cycling, including, but not limited to, sing the frequency of the cycling and/or decreasing the magnitude of the manic and/or depressive phases.

Thus, in an embodiment, the pharmaceutical composition ofthe present invention may be used for mood stabilization, in particular mood stabilization for manic depression.

As used herein, the term "epileptogenesis" refers to the gradual process by which epilepsy develops. This process may occur following brain insults or a y of conditions, including neurodegenerative diseases, traumatic brain , stroke, brain tumor, infections of the central nervous system, and status epilepticus; or it may occur following gene mutations.

As used herein, the term "anxiety" refers in particular to generalized anxiety disorder.

As used herein, the term "about" has its conventional meaning. In particular embodiments, when in relation to a numerical value, it may be reted to mean the numerical value :: 10%, or :: 5%, or :: 2%, or :: l%, or :: 0.5 %, or :: 0.1%. In other embodiments, the precise value is meant, i.e. by leaving out the word "about".

"And/0r" means that each one or both or all of the components or features of a list are possible ts, especially two or more thereof in an alternative or cumulative way.

As used herein, the term " 3, " , an", "the" and similar terms used in the context of the present invention (especially in the context of the claims) are to be ued to cover both the singular and plural unless otherwise indicated herein or clearly contradicted by the context.

The following Examples are set forth to aid in the understanding of the invention, and are not intended and should not be construed to limit in any way the invention set forth in the claims which follow thereafter.

A) COMPOUNDS OF FORMULA (I-B) — CHEMISTRY AND IN VITRO TESTING Several methods for preparing the compounds of Formula (I-B) of this invention are illustrated in the following Examples. Unless otherwise noted, all starting materials were obtained from commercial suppliers and used without fithher purification.

Hereinafter, "aq." means s; "DCE" means l,2-dichloroethane, "DCM" means romethane; "DIPE" means diisopropylether; "DIPEA" means N,N— diisopropylethylamine; "DMF" means N,N-dimethylformamide; "ES" means electrospray; "Et3N" means triethylamine; "EtzO" means diethyl ether; "EtOAc" means ethyl acetate; "h" means hours; "HPLC" means high performance liquid chromatography; "HRMS" means high-resolution mass spectra/spectrometry; "l" or "L" means liter; "LRMS" means solution mass spectrometry/spectra; "MeOH" means methanol; "min" means minute(s); "mp" means melting point; "Pd(PPh3)4" means tetrakis(triphenylphosphine)palladium(0); "RP" means reverse phase; "r.t." means room temperature; "s" means seconds; "sat." means saturated; "SFC" means supercritical fluid chromatography; "sol." means solution; "THF" means tetrahydrofllran.

Microwave assisted ons were performed in a single-mode reactor: InitiatorTM Sixty EXP microwave reactor (Biotage AB), or in a multimode r: MicroSYNTH Labstation (Milestone, Inc.).

Thin layer chromatography (TLC) was carried out on silica gel 60 F254 plates (Merck) using reagent grade solvents. Open column chromatography was performed on silica gel, particle size 60 A, mesh = 230-400 (Merck) using standard techniques. Automated flash column tography was performed using ready-to-connect cartridges from Merck, on irregular silica gel, particle size 15-40 um (normal phase disposable flash 3O s) on a SPOT or LAFLASH system from Armen Instrument.

The absolute stereochemical uration for some of the nds was determined using vibrational circular dichroism (VCD). They were ed on a Bruker Equinox 55 equipped with a PMA 37, in a KBr liquid cell using CDzClz as solvent (PEM: l350cm—l, LIA: lmV, resolution: 4 cm'l). A description on the use ofVCD for the ination of absolute configuration can be found in Dyatkin AB. et. al, Chirality, 14:215-219 (2002).

Whenever the notation "RS" is indicated herein, it denotes that the compound is a racemic mixture, unless otherwise indicated. The stereochemical configuration for some compounds has been designated "R" or "S" when the mixture was separated; for some compounds, the stereochemical ration has been designated as "*R" or "*S" when the absolute chemistry is undetermined although the compound itself has been isolated as a single isomer and is enantiomerically pure. The enantiomeric excess of compounds reported herein was determined by analysis ofthe racemic mixture by supercritical fluid chromatography (SFC) followed by SFC comparison of the ted enantiomer(s).

Preparation of ediates Description 1 - Intermediate 1 Z\/U\CI Cyclopropylacetic acid ([CAS 52397], 50 g, 500 mmol) was ved in CHzClz (300 mL) then SOClz (100 mL) was added. The reaction e was stirred at 60 °C for 2 h and then the solvent was evaporated to yield intermediate 1 (53 g, 90%), which was used without further purification.

Description 2 - Intermediate 2 CIFF |\ F To a solution of 2,4-dichloroiodopyridine ([CAS 3437812], 290 g, 1058 mmol) in DMF (1.7 L) was added methyl 2,2-difluoro(fluorosulfonyl)acetate ([CAS 680- -9], 403 g, 2098 mmol) and CuI (403 g, 2. 13 mol), the reaction was then heated at 100 0C for 5 h.

The reation was cooled and filtered. The filtrate was diluted with H20 and ted with EtZO and washed with a NH3 solution. The organic layer was dried (NaZSO4), filtered and concentrated in vacuo to yield intermediate 2 (160 g), which was used without fiarther purification.

Description 3 - Intermediate 3 ©—\F CI 0 / \ To a on ofNaH (60% in oil, 24 g, 600 mmol) in DMF (2 L) at 0 0C was added benzyl alcohol (35 g, 325 mmol), then the on was stirred for 2 min. Intermediate 2 (160 mg, 741 mmol) was added in one portion, and d at 0 0C for l h. The on was diluted by the addition ofH20 and extracted with EtZO. The organic layer was dried 4), filtered and concentrated in vacuo. The residue was purified by column chromatography over silica gel (eluent: petroleum ether/EtOAc = 20/ l). The pure fractions were collected and the solvent was evaporated to yield intermediate 3 (100 g, 38%).

Description 4 - Intermediate 4 Q. .H | N\NH2 To a solution of intermediate 3 (100 g, 277 mmol) in l,4-dioxane (1.5 L) was added NHZNHZ hydrate (85% solution in water, 300 g, 9.11 mo 1), the reaction was then heated in sealed tube at 160 0C for 2 h. The mixture was concentrated in vacuo, dissolved in DCM, washed with NaHCOg. The organic layer was dried (Na2S04), filtered and concentrated in vacuo to yield intermediate 4 (90 g, 90%), which was used without further purification.

Description 5 - Intermediate 5 To a solution of intermediate 4 (90 g, 318 mmol) in CHzClz (1.5 L) was added triethylamine (64.3 g, 636 mrnol), the mixture was cooled to 0 0C, then a solution of intermediate 1 (53 g, 449 mrnol) in CHzClz was added. The solution was stirred at RT for l h. The reaction mixture was washed with a sat. aq. sol. ofNaHC03, and extracted 2015/051029 with CHzClz. The organic layer was dried (Na2S04), d and concentrated in vacuo to yield intermediate 5 (104.4 g, 90%).

The following intermediates were synthesized following a synthetic sequence analogous to that reported in Description 5 (D5). ediate Acid chloride Conditions F propionyl chloride Addition run at F FHNJK/ ©\/0 ([CAS 798]) RT.

Intermediate 6 Q/OF O F H utaneacetyl Conditions as in F .

NIH I< chlor1de ([CAS D5. / <> l 595433]) Intermediate 7 ©\/0 F o 2-ethoxy—acetyl Conditions as in F " L/‘k/ chloride ([CAS D5. / \fi \ IN 140778]) Intermediate 8 QCF O butyryl chloride Conditions as in F H M ([CAS1413]) D5.

/ \N I H Intermediate 25 Description 6 (a) Intermediate 9 F N"N To a solution of intermediate 5 (101 g, 277 mmol) in CH3CN (1.2 L) were added phosphorus(V) oxychloride (84.7 g, 553 mmol) and N,N—diisopropylethylamine (71.3 g, 553 mmol). The on mixture was stirred at 90 0C for 38 h. The reaction was then diluted with DCM and washed with a N32C03 solution. The organic layer was dried (NaZSO4), filtered and concentrated in vacuo. The e was purified by column chromatography over silica gel (eluent: petroleum ether/EtOAc = 4/ 1). The pure fractions were collected and the solvent was evaporated to yield intermediate 9 (31.39 g, 41%). (b) Intermediate 10 F N’N F | \ The reaction was performed in 4 batches then combined for work up and purification.

To a solution of intermediate 6 (7 g, 20.6 mmol) in DCE (50 mL), was added N,N— diisopropylethylamine (3.96 mL, 22.69 mmol) and then phosphorus oxychloride (2.12 mL, 22.69 mrnol) and the reaction mixture was heated in a microwave at 150 0C for 5 min. Then DCM was added and the organic layer was washed with a sat. sol. of NaHC03, dried (NaZSO4) and concentrated in vacuo to afford the desired compound, which was purified by column chromatography (gradient elution: DCM 100% to MeOH.NH3 2% in DCM) to yield intermediate 10 (2.5 g, 49%).

The following intermediates were synthesized following a tic sequence analogous to that ed in ption 6(a) or (b).

Intermediate Starting material Conditions Intermediate 7 on performed as in (a) F N—N / w but in CHgCN. After the l reaction was complete, the CI reaction mixture was poured Intermediate 1 1 into ter then washed with NaHCO3 sat. sol. And extracted with DCM, dried (NaZSO4), filtered and concentrated. Purification was performed in Spot (Si cartridge, eluent DCM/EtOAc up to 10—20%). _ 59 _ Intermediate Starting material Conditions J ediate 8 Reaction performed as in (b).

F I \ Purification by flash column N chromatography (silica; / EtOAc in DCM 0/100 to 40/60).

Intermediate 12 F N’N Intermediate 25 Reaction performed as in (a).

F | \>_/— Purification by flash column F N / chromatography (silica; MeOH in CHzClz, from 0/100 Intermediate 26 to 4/96).

Description 7 - Intermediate 13 F N—NM (Pth)4Pd (2.096 g, 1.81 mmol) was added to a stirred on of ediate 9 (10 g, 36.28 mmol) and 4,4,5,5-tetramethylVinyl-l,3,2-dioxoborolane ([CAS 759270], 7.77 mL, 43.53 mmol) in deoxygenated dioxane (30 mL) and a enated NaHC03 ted solution (30 mL) under nitrogen. The mixture was stirred at 100 0C for 18 h.

The mixture was d with EtOAc/water and filtered through a pad of diatomaceous earth. The filtrate was treated with brine and extracted with EtOAc. The organic layer was separated, dried (Na2S04), filtered and the solvents evaporated in vacuo. The crude product was purified by flash column chromatography (silica; EtOAc in CHzClz 0/100 to 5/95). The desired fractions were collected and concentrated in vacuo to yield intermediate 13 (6.08, 63%) as a yellow solid.

The following intermediates were synthesized following a synthetic ce analogous to that reported in Description 7.

Intermediate Starting material Conditions Intermediate 10 Reaction performed at 150 oC.

Purification by flash column chromatography a; 7N solution of ammonia in methanol in DCM 0/100 to Intermediate 14 1/9).

F N——NMD Intermediate 1 1 Extraction with DCM, purification by flash column chromatography (silica; MeOH in DCM 4/96).

Intermediate 12 ation by flash column chromatography (silica; EtOAc in DCM 0/100 to Intermediate 16 F N’N>_/— Intermediate 26 Reaction mixture performed at 150 0C in microwave. ation by flash column chromatography (silica; EtOAc in DCM 0/100 to Intermediate 27 1 0/90).

Description 8 (a) Intermediate 17 FF N|\>_)>,N Osmium tetraoxide (2.5% in t-BuOH, 10.103 mL, 0.781 mmol) and then, sodium periodate 12.53 g, 58.58 mmol) in water (48.5 mL) were added to a suspension of ediate 13 (6.08 g, 20.02 mmol) in dioxane (192 mL). The mixture was stirred at room temperature for 2 h.

The mixture was treated with water and EtOAc and it was filtered off through a pad of diatomaceous earth. The filtrate was ted with EtOAc. The organic layer was separated, dried (Na2S04), filtered and the solvents evaporated in vacuo. The crude product was washed with EtZO and it was filtered and dried to yield intermediate 17 (4.25 g, 79%) as a brown solid. (b) Intermediate 18 F N---N />\/ F N H / A sion of sodium periodate (5.04 g, 23.54 mmol) in distilled water (19 mL) was added to a stirred solution of osmium tetraoxide (2.5% in t-BuOH, 4.06 mL, 0.31 mrnol) and intermediate 14 (2.08 g, 7.85 mmol) in dioxane (75 mL). The e was stirred at room temperature for 150 min, and then the mixture was treated with sat NaHC03 and brine, and extracted with DCM. The organic layer was separated, dried (Na2S04), filtered and concentrated in vacuo. The t was triturated with EtZO and filtered in vacuo, and finally put in desiccator at 50 0C for 18 h, to yield intermediate 18 (1.6 g, 80%) as a brown solid.

The following intermediates were synthesized following a synthetic sequence analogous to that reported in Description 8.

Intermediate Starting material Conditions Intermediate 15 F N—N Procedure as in (a).

/ \ F N F l H / Intermediate 19 OJ ediate 16 Procedure as in (a) .

F N’N F | \>_/ F N H / Intermediate 20 _ 62 _ Intermediate Starting material Conditions F '7": Intermediate 27 Procedure as in (a), order of F N>\/\ addition: osmium tetroxide was H / added to a stirred solution of intermediate 27 in 1,4-di0xane, then a suspension of sodium Intermediate 28 periodate in water was added and the reaction mixture was d for 2 h at RT. No filtration through a pad of diatomaceous earth.

Description 9 (a) Intermediates 21a, 21b and 21c . N—w OH OH Intermediate 21a Intermediate 21b ediate 21c Methylmagnesium bromide (1.4 M in THF, 12.40 mL, 17.37 mrnol) was added dropwise to a stirred suspension of intermediate 17 (4.25 g, 15.79 mmol) in THF (281.07 mL) at -20 0C under N2 atmosphere. The mixture was stirred at -20 0C for 45 minutes. The crude was treated with a sat. sol. ofNH4C1 and extracted with EtOAc.

The organic layer was separated, dried (Na2S04), filtered and trated in vacuo.

The residue was purified by flash column chromatography a; MeOH in DCM 0/100 to 4/96). The desired fractions were collected and concentrated in vacuo to yield intermediate 21a ic mixture) (2.96 g, 66%). Intermediate 21a (1.82 g) was purified by chiral SFC: onary phase: CHIRALPAK AD-H (5 urn 250 x20 mm), Mobile phase: 80% C02, 20% EtOH] yielding 21b (R-enantiomer) (0.453 g, 10%) as a pale grey solid and intermediate 21c (S—enantiomer) (0.439 g, 10%). (b) Intermediate 22 F N——N Methylmagnesium bromide (1.4 M in THF, 3.97 mL, 5.56 mmol) was added se to a stirred suspension of intermediate 18 (1.23 g, 5.06 mmol) in THF (90 mL) at -20 0C under N2 atmosphere. The mixture was stirred at -20 0C for 45 minutes. The crude was treated with a sat. sol. ofNH4C1 and ted with EtOAc. The organic layer was separated, dried (NaZSO4), filtered and concentrated in vacuo. The residue was d by flash column chromatography (silica; MeOH in DCM 0/100 to 4/96). The desired fractions were collected and concentrated in vacuo. The residue thus obtained was triturated with EtZO to yield ediate 22 (620 mg, 35%) as a pale yellow solid.

The following intermediates were synthesized following a synthetic sequence analogous to that reported in Description 9.

Intermediate Starting material Conditions F N_N>\):| Intermediate 19 Procedure (b).

Intermediate 20 Procedure (b).

Intermediate 28 ure (b).

Intermediate 29 ediate 24a was further separated into Intermediate 24b and Intermediate 24c: Intermediate 24b Intermediate 24c Chiral SFC conditions: Stationary phase Chiralpak AD-H 5 um 250*30 mm; Mobile phase: 80% C02, 15% EtOH Preparation of the final compounds of Formula (I-B) Example 1 (a) Synthesis of nds 4-b, 6-b and 5-b F N’N>_)> nd 4-b Compound 6-b Compound 5-b DIAD (2.07 mL, 10.52 mmol) was added dropwise to a stirred solution of intermediate 21a (2 g, 7.01 mmol), 2,4-difluorophenol (1.00 mL, 10.52 mmol) and triphenylphosphine (2.76 g, 10.52 mmol) in THF (74.18 mL) at 0 0C and under nitrogen atmosphere. The mixture was stirred at 100 0C for 10 minutes under microwave irradiation. The e was diluted with EtOAc and washed with a sat. sol. of NaHC03. The organic layer was separated, dried (NazSO4), filtered and concentrated in vacuo. The residue was purified by flash column chromatography a; MeOH in DCM 0/100 to 97/3). The desired fractions were collected and trated in vacuo.

The residue was triturated with DIPE to give compound 4-b (1.46 g, 52%) as a white solid, which was purified by chiral SFC [Stationary phase: Chiralpak AD (5um 250*30 mm, Mobile phase: 85% C02, 15% iPrOH)], yielding compound 6-b (0.659 g, 24%) and compound 5-b (0.693 g, 25%). (b) Alternative synthesis of compound 6-b F N’N>_)> Co. No. 6-b DIAD (31.06 uL, 0.16 mmol) was added dropwise to a stirred solution of intermediate 21b (30 mg, 0.11 mmol), 2,4-difiuorophenol (15.07 uL, 0.16 mmol) and triphenylphosphine (41.38 mg, 0.16 mmol) in THF (1.11 mL) at 0 0C and under en atmosphere. The mixture was stirred at 100 0C for 10 minutes under microwave irradiation. The mixture was diluted with EtOAc and washed with a sat. sol. ofNaHCOg. The organic layer was separated, dried (Na2S04), filtered and concentrated in vacuo. The residue was purified by flash column chromatography (silica; MeOH in DCM 0/100 to 97/3). The desired fractions were ted and concentrated in vacuo.

The residue was triturated with DIPE to give compound 6-b (40 mg, 96%) as a white solid. (c) Synthesis of compound 6-b hydrochloride salt (.HCl) DIAD (207.06 uL, 1.05 mmol) was added dropwise to a stirred solution of ediate 21b (200 mg, 0.70 mmol), 2,4-difluorophenol (100.45 uL, 1.05 mmol) and triphenylphosphine (275.84 mg, 1.0516 mmol) in THF (4 mL) at 0 0C and under nitrogen atmosphere. The mixture was stirred at 100 0C for 15 minutes under microwave irradiation. The mixture was diluted with EtOAc and washed with a sat. sol. ofNaHCOg. The organic layer was separated, dried (Na2S04), filtered and concentrated in vacuo. The residue was d by RP HPLC (Stationary phase: C18 XBridge 30 x 100 mm 5 mm, Mobile phase: Gradient from 60% 0.1% NH4C03H/NH4OH pH 9 on in Water, 40% CH3CN to 43% 0.1% H/NH4OH pH 9 solution in Water, 57% CH3CN), yielding a white solid residue that was dissolved in EtZO (8 mL) and 1,4-dioxane (0.5 mL). To the solution thus obtained HCl (4M in dioxane, 200 uL) was added se. The white solid precipitate was filtered, washed with EtZO, dried (Na2S04) and evaporated under vacuum. The white residue thus obtained was triturated with EtZO to give nd 6-b .HCl (110 mg, 36%) as a white solid.

The following compounds were synthesized following a tic sequence analogous to that reported in Example 1(b), ng from intermediate 21b.

Co. Co.

(R)n (R)n No. No. 9-b QF 12-b F CI -b O 13-b Q 11-b ii" Z)" F F Example 2 Synthesis of compound 7-b F Nl\>—)>,N Co. No. 7-b Procedure (21): DIAD (31.06 uL, 0.158 rnrnol) was added dropwise to a stirred solution ofinterrnediate 21b (30 mg, 0.105 rnrnol), 3,5-difluorophen01 (20.52 mg, 0.158 ) and triphenylphosphine (41.38 mg, 0.158 rnrnol) in THF (1.113 rnL) at 0 0C and under nitrogen atmosphere. The mixture was stirred at 100 0C for 10 minutes under microwave irradiation. The mixture was diluted with EtOAc and washed with a sat. sol. ofNaHCOg. The organic layer was separated, dried (Na2S04), filtered and concentrated in vacuo. The residue was purified by flash column chromatography a; MeOH in DCM 0/100 to 96/4). The desired fractions were collected and concentrated in vacuo.

The residue was triturated with DIPE to give compound 7-b (21 mg, 50%) as a white solid.

Procedure (b): atively, compound 7 was also synthesized following a synthetic sequence analogous to that reported in Example l(b), starting from intermediate 21b.

Example 3 Synthesis of compound 8-b F ,N Co. No. 8-b Procedure (a): DIAD (31.06 uL, 0.158 mmol) was added se to a stirred solution of intermediate 21b (30 mg, 0.105 mmol), 3,4-difluorophenol (20.52 mg, 0.158 mmol) and triphenylphosphine (41.38 mg, 0.158 mmol) in THF (1.11 mL) at 0 0C and under en atmosphere. The mixture was stirred at 100 0C for 10 minutes under microwave irradiation. The mixture was diluted with EtOAc and washed with a sat. sol.

Og. The organic layer was separated, dried (Na2S04), filtered and concentrated in vacuo. The e was purified by flash column chromatography (silica; MeOH in DCM 0/100 to 96/4). The desired fractions were ted and concentrated in vacuo.

The residue was triturated with DIPE to give compound 8-b (10.6 mg, 25%) as a white solid.

Procedure (b): Alternatively, compound 8-b was also synthesized following a tic sequence analogous to that reported in Example l(b), starting from intermediate 21b. _ 68 _ Example 4 Synthesis of nd 15-b F )> F F Co. No. 15-b Procedure (a): DIAD (155.3 uL, 0.789 mmol) was added dropwise to a stirred solution ofintermediate 21b (150 mg, 0.526 mmol), trifiuorophenol (116.8 mg, 0.789 mol) and triphenylphosphine (206.88 mg, 0.789 mmol) in THF (5.56 mL) at 0 0C and under nitrogen atmosphere. The mixture was stirred at 100 0C for 10 s under microwave. The mixture was d with DCM and washed with a sat. sol. of NaHC03. The organic layer was separated, dried (Na2S04), filtered and concentrated in vacuo, then purified by flash column chromatography (silica; MeOH/NH3 7 N in DCM 0/100 to 90/10). The desired ons were collected and concentrated in vacuo. The was purified by RP HPLC (Stationary phase: C18 XBridge 30 x 100 mm 5 urn, Mobile phase: Gradient from 54% 0.1% NH4C03H/NH4OH pH 9 solution in Water, 46% CH3CN to 64% 0.1% NH4C03H/NH4OH pH 9 solution in Water, 36% CH3CN) yielding a colourless oil that was crystallized upon standing (2 days). The solid was ated with heptane to give compound 15-b (129.8 mg, 59%) as a white solid.

Procedure (b): Alternatively, compound 15-b was also synthesized following a synthetic sequence analogous to that reported in Example 1(b), starting from intermediate 21b.

Example 5 Synthesis of compounds l-b, 2-b and 3-b F N’N>_)> Compound 2-b Compound 3-b Compound 1-b Compounds l-b, 2—b and 3-b were synthesized following the procedure described in Example 1(a). Thus, reaction of DIAD 5 uL, 2.54 mmol), intermediate 21a (483 W0 2015/110435 mg, 1.69 mmol), 4-fiuorophenol (227.77 mg, 2.03 mmol) and triphenylphosphine (666.14 mg, 2.54 mmol) in THF (17.91 mL) as described in Example 1(a) yielded a residue that was purified by flash column chromatography (silica; EtOAc in DCM 0/100 to 90/10). The d fractions were collected and concentrated in vacuo. The resulting residue was triturated with DIPE to yield compound l-b (320 mg, 50%) as a white solid, which was purified by chiral SFC [Stationary phase: Chiralpak AD (5um 250*30 mm, Mobile phase: 77% C02, 23% MeOH)], ng compound 2-b (131mg, %) and compound 3-b (129 mg, 20%) as white solids.

Synthesis of compounds 24-b, 26-b, and 27—b F N’N F N’N \ \>_/ Compound 24-b Compound 26-b Compound 27—b Compounds 24-b, 26—b and 27-b were synthesized following the procedure described in Example 1(a). Thus, reaction of DIAD (364.57 uL, 1.85 mmol), intermediate 22 (320 mg, 1.23 mmol), 2,4-difiuorophenol (176.86 uL, 1.85 mrnol) and triphenylphosphine (485.67 mg, 1.85 mmol) in THF (13.06 mL) as described in Example 1(a) yielded a residue that was purified by flash column chromatography a; MeOH in DCM 0/100 to 96/4). The desired fractions were collected and trated in vacuo to yield a colourless oil that llized with DIPE to give compound 24 as a white solid, which was purified by RP HPLC (Stationary phase: C18 XBridge 30 x 100 mm 5 um; mobile phase: Gradient fiom 54% 0.1% NH4C03H/NH4OH pH 9 on in Water, 46% CH3CN to 64% 0.1% NH4C03H/NH4OH pH 9 solution in Water, 36% CH3CN) yielding a colourless oil that was crystallized upon trituration with heptane to give 240 mg (52%) of compound 24-b as a white solid, which was then purified by chiral SEC (Stationary phase: PAK AD-H Sum 250x20mm; mobile phase: 85% C02, 15% iPOH (0.3% iPrNH2)), yielding compound 26-b (103 mg, 22%) and compound 27-b (107 mg, 23%).

The following nds were obtained following a synthetic sequence similar to that reported in Example 1(a).

F N’hi>_/ Compound 25-b Compound 28-b Compound 29-b Starting al: Intermediate 22 Chiral SFC conditions: Stationary phase: Chiralpak AD-H 5pm 250 x 20 mm); Mobile phase: 85% C02, 15% e of EtOH/iPrOH 50/50 V/V (+03% iPrNHz) F N’Nf Compound 16-b Compound 17-b Compound 18-b Starting material: Intermediate 23 Chiral SFC conditions: Stationary phase: Chiralpak AD-H (5 mm 250*30 mm); Mobile phase: 80% C02, 20% mixture MeOH/iPrOH 50/50 V/V (+03% iPrNHz) The ing compounds were synthesized following a synthetic sequence as reported in e l(b), starting from the indicated intermediates.

Compound 20-b; obtained from Compound 21-b; obtained from intermediate 24c intermediate 24b Compound 19—b; ed from nd 22-b; obtained from intermediate 24a intermediate 24c Compound 30-h; obtained from intermediate 29 Compound 23-b; obtained from intermediate 24b F N’N>_/— Compound 31-b; Compound 32-b; Starting material: Intermediate 30 Chiral SFC conditions: Stationary phase: Chiralpak AD-H Sum 250 x 20 mm); Mobile phase: 85% C02, 15% iPrOH.

Table A below lists additional compounds of Formula (I-B) which were prepared by analogy to the above examples (Exp. no.).

Table A: Example compounds according to Formula (I-B). # indicates that the mental procedure is described in the examples.

/ N>\R1 0 / Exp no. 1 R Ar Stereo-chem. [10. / "-1 l-b E5# | RS 2-b E5# V l *R 3-b E5# <7 I *S 4-b El# | RS / -—-— -b El# W \J R F F E] (:)):1nd ' F E1(c)# F b.HCl 7-b E2# W K) s 8-b E3# W 1:} s 9-b E1(b) W ' S WO 10435 _ 73 _ / N»\R1 0 / Exp no. 1 R Ar Stereo-chem. -h E1(b) W Q S 11-b E1(b) W Q S 12-b E1(b) W Q S F o/ 13-b E1(b) W Q S 14-b E1(b) W Q S -b E4# W Q’ S F F 16-b E1(a) E Q RS F F 17-b E1(a) E Q *R F F __ E 18-b E1(a) *S FQ F 19-b E1(b) \o/\ RS FQ F 2015/051029 F3C /»\R1 0 / Exp no. 1 R Ar Stereo-chem. -h E1(b) \o/\ Q *R F F 21-b E1(b) \o/\ *S FQ F F F F F 24-h E6# -"'\ Q RS F F -b E1 "'\ Ki RS F F 26-h E6# --"\ *R FQ F 27-b E6# --"\ Q *S F F 28-b E1 "'\ *R _ 75 _ / N»\R1 0 / Exp no. 1 R Ar Stereo-chem. 29-h we \ Ki *8 F F -b E1(b) V RS 31-b Elan V Q *R F F 32-b Bub) V /©\ *5 F F Analytical part Optical Rotations Optical rotations were measured on a Perkin-Elmer 341 polarimeter with a sodium lamp and reported as follows: [(1]0 (7t, c g/100ml, solvent, TOC). [(1]ny = (100a) / (l x c) : where l is the path length in dm and c is the concentration in g/100 ml for a sample at a temperature T (0C) and a wavelength X (in mm). If the wavelength of light used is 589 nm (the sodium D line), then the symbol D might be used d. The sign of the rotation (+ or -) should always be given. When using this equation the concentration and solvent are always provided in parentheses after the rotation. The rotation is reported using degrees and no units of concentration are given (it is assumed to be g/100 ml).

LCMS For (LC)MS-characterization of the nds of the t invention, the following methods were used.

General ure The High Performance Liquid Chromatography (HPLC) measurement was performed using a LC pump, a diode-array (DAD) or a UV detector and a column as specified in the respective methods. If necessary, onal ors were included (see table of methods below).

Flow from the column was brought to the Mass Spectrometer (MS) which was configured with an atmospheric pressure ion source. It is within the knowledge of the skilled person to set the tune parameters (e. g. scanning range, dwell time...) in order to obtain ions allowing the identification of the compound’s nominal otopic molecular weight (MW). Data acquisition was performed with appropriate software. nds are described by their experimental retention times (R) and ions. If not ed differently in the table of data, the reported molecular ion corresponds to the [M--H]+ (protonated molecule) and/or [M-H]' (deprotonated molecule). In case the compound was not ly ionizable the type of adduct is specified (i.e. [M+NH4]+, [M--HCOO]', etc. . .). For molecules with multiple isotopic patterns (Br, Cl..), the reported value is the one obtained for the lowest e mass. All results were obtained with experimental uncertainties that are commonly associated with the method used.

Hereinafter, "SQD" means Single Quadrupole Detector, "RT" room temperature, "BEH" bridged ethylsiloxane/silica , "HSS" High Strength Silica, "DAD" Diode Array Detector.

Table B: LCMS Method codes (Flow expressed in mL/min; column temperature (T) in oC; Run time in s).

Mobile phase Gradient Agilent: A: 95% From 95% Eclipse Plus CH3COONH4 A to 5% A C18 RRHD 6.5mM + 5% in 4.6min, (1.8um, CH3CN, B: held for 2.1x50mm) CH3CN 0.4min A: 95% From 95% Waters: CH3COONH4 A to 5% A CSHTM C18 6.5mM + 5% in 4.6min, (1.7um, CH3CN, B: held for 2.1x50mm) CH3CN 0.4min 2015/051029 84.2% A for 0.49min, to .5% A in A: 95% 2.18min, Waters: BEH NH4 held for 7mM / 5% 1.94min, 2.1X100mm) CH3CN, back to B: CH3CN 84.2% A in held for 0.73min.

A: 95% Waters: From 95% CHgCOONH4 CSHTM C 1 8 A to5% A in 6.5mM + 5% (l.7um, 7.8min, held CH3CN, B: 2.1X50mm) for l.2min CH3CN Melting points Values are peak values, and are obtained with experimental uncertainties that are commonly associated with this analytical method.

Mettler FP 81HT/FP90 apparatus For a number of compounds, melting points were determined in open capillary tubes on a PP 81HT / FP90 apparatus (Mettler-Toledo). Melting points were measured with a temperature gradient of l, 3, 5 or 10 oC/minute. Maximum temperature was 300 oC.

The melting point was read from a digital display.

Table C: Physico-chemical data for some compounds, retention time (R) in min, [M+H]+ peak (protonated le), LCMS method and mp (melting point in oC). (n.d. = not determined).

C0. Mp Rt + LCMS [MH l Optical Rotation' ° no. (0C) (min) method 1.10 156.3 2.32 380 1 -585 O (589 nm, c 0.53 2-1, 176.9 2.93 380 3 w/V%, DMF, 20 °C) +594 0 (589 nm, c 0.52 3.10 177.3 2.93 380 3 W/V%, DMF, 20 °C) 2015/051029 _ 78 _ C0. Mp Rt + LCMS [MH ] Optlcal Rotatlon. . no. (0C) (min) method 4-b 121.7 2.41 398 1 +957 0 (589 11m, 0 0.69 -b 142 2.99 398.3 3 w/V%, DMF, 20 0C) -954 o (589 mm, c 0.7 6-b 142.4 2.99 398.2 3 W/V%’ DMF, 20 0C) -557 o (589 mm, c 0.96 7-b 170.08 2.37 398 2 w/V %, DMF, 20 0C) 8-b n.d. 2.32 398 2 n.d. 9-b n.d. 2.32 398 2 n.d. -b n.d. 2.25 398 2 n.d. 11-b n.d. 2.28 398 2 n.d. 12-b n.d. 2.16 410 2 n.d. 13-b 144.1 2.68 410 2 n.d. 14-b 161.7 2.51 394 2 n.d. -167.0 0 (589 nm, c -b 80.3 2.37 416 2 0.55 w/V%, DMF, 20 16—b n.d. 2.50 412 2 n.d. 17-b n.d. 3.12 412 3 n.d. 18-b n.d. 3.12 412 3 n.d. l9-b n.d. 2.39 402 2 n.d. -b n.d. 2.3 402 2 n.d. _ 79 _ C0. Mp R + LCMS [MH ] Optlcal Rotatlon. . no. (0C) (min) method 21-b n.d. 3.36 402 n.d. 22-h n.d. 2.35 420 2 n.d. 23-b n.d. 2.35 420 2 n.d. 24-b 135.7 2.05 372 2 n.d. -b 138.3 2.13 390 2 n.d. -83.9 o (589 nm, 0 0.52 26-b n.d. 2.80 372 3 W/V %, DMF, 25 0C) +921 0 (589 27-b n.d. 2.80 372 nm, c 0.55 W/V %, DMF, 25 0C) -129.2 0 (589 nm, 0 0.5 28-b n.d. 2.85 390 3 w/V %, DMF, 25 0C) +1373 0 (589 nm, c 29-b n.d. 2.85 390 3 0.51 w/V %, DMF, 25 -b 130.6 2.29 386 2 n.d. -67.5 o (589 nm, 0 0.83 31-b 127.85 2.29 386 2 w/V %, DMF, 20 0C) +895 0 (589 nm, 0 0.83 32-b 127.69 2.29 386 2 w/V %, DMF, 20 0C) SFC-MS General grocedure The SFC measurement was performed using Analytical system from Berger instrument comprising a FCM-1200 dual pump fluid control module for delivering carbon e (CO2) and modifier, a CTC ics automatic liquid sampler, a TCM-20000 thermal control module for column heating from room temperature to 80°C. An Agilent 1100 UV photodiode array detector equipped with a high-pressure flow cell standing up to 400 bars was used. Flow from the column was split to a MS ometer. The MS detector was configured with an atmospheric pressure ionization source.The following ionization parameters for the Waters ZQ mass spectrophotometer are: corona: 9ua, source temp: 140°C, cone: 30 V, probe temp 450°C, tor 3 V, desolvatation gas 400L/hr, cone gas 70 L/hr. Nitrogen was used as the nebulizer gas. Data acquisition was performed with a Waters-Micromass MassLynX-OpenlynX data system.

Method 1: In on to the general procedure: The analytical chiral separation in SFC- MS was carried out on a CHIRALPAK AD DAICEL column (10 um, 4.6 X 250 mm) at 0C with a flow rate of 3.0 ml/min. The mobile phase is 85% C02, 15% iPrOH (+ 0.3% 1PI'NH2) hold 7 min in isocratic mode.

Method 2: In addition to the l procedure: The analytical chiral separation in SFC- MS was carried out on a CHIRALPAK AD DAICEL column (10 um, 4.6 X 250 mm) at 0C with a flow rate of 3.0 ml/min. The mobile phase is 75% C02, 15% iPrOH (+ 0.3% iPrNHz) hold 7 min in isocratic mode.

Method 3: In addition to the general procedure: The ical chiral separation in SFC- MS was carried out on a CHIRALPAK AD DAICEL column (10 um, 4.6 X 250 mm) at 0C with a flow rate of 3.0 ml/min. The mobile phase is 80% C02, 10% Methanol + % iPrOH (+ 0.3% iPrNHz) hold 7 min in tic mode.

Table D: Analytical SFC data — Rt means retention time (in minutes), [M+H]+ means the protonated mass of the nd, method refers to the method used for SFC/MS analysis of enantiomerically pure compounds. The measurement was compared against the mixture.

C0. Isomer Elution Rt [M+H]+ UV Area % Method Nr. Oram 6-b 4.28 398 100 1 A S-b 5.98 398 100 1 B 2-b 2.13 380 100 2 A 3-b 2.97 380 100 2 B 17-b 2.46 412 100 3 A 18-b 3.12 412 100 3 B 31-b 2.93 386 100 1 A 32-h 3.81 386 100 1 B *A means the first isomer that elutes. B means the second isomer that elutes.

Nuclear Magnetic Resonance (NMR) For a number of compounds, 1H NMR spectra were recorded either on a Bruker DPX- 400 or on a Bruker AV-SOO spectrometer with standard pulse ces, operating at 400 MHz and 500 MHz respectively. Chemical shifts (8) are reported in parts per million (ppm) downfield from tetramethylsilane (TMS), which was used as internal Co. No. 6-b: 1H NMR (400 MHz, CDClg) 8 ppm 0.30 _ 0.38 (m, 2 H), 0.59 — 0.68 (m, 2 H), 1.14 _ 1.22 (m, 1 H), 1.72 (d, J=6.5 Hz, 3 H), 3.02 _ 3.14 (m, 2 H), 5.84 (q, J=6.3 Hz, 1 H), 6.67 — 6.73 (m, 1 H), 6.80 — 6.89 (m, 2 H), 7.30 (d, J=7.4 Hz, 1 H), 8.11 (d, J=7.4 Hz, 1 H) Co. No. 7-b: 1H NMR (400 MHz, CDC13) 8 ppm 0.30 _ 0.39 (m, 2 H), 0.59 — 0.68 (m, 2 H), 1.11 _ 1.23 (m, 1 H), 1.70 (d, J=6.5 Hz, 3 H), 3.01 _ 3.14 (m, 2 H), 5.83 (q, J=6.2 Hz, 1 H), 6.35 — 6.45 (m, 3 H), 7.13 (d, J=7.2 Hz, 1 H), 8.08 (d, J=7.4 Hz, 1 H) Co. No. 8-b: 1H NMR (400 MHz, CDC13) 8 ppm 0.30 _ 0.38 (m, 2 H), 0.58 — 0.68 (m, 2 H), 1.11 _ 1.22 (m, 1 H), 1.69 (d, J=6.2 Hz, 3 H), 3.01 _ 3.13 (m, 2 H), 5.79 (q, J=6.2 Hz, 1 H), 6.53 (dtd, J=9.2, 3.1, 3.1, 1.7 Hz, 1 H), 6.72 (ddd, J=11.6, 6.5, 3.1 Hz, 1 H), 6.95 _ 7.04 (m, 1 H), 7.15 (d, J=7.4 Hz, 1 H), 8.07 (d, J=7.4 Hz, 1 H) Co. No. 15-h: 1H NMR (500 MHz, CDC13) 8 ppm 0.30 _ 0.41 (m, 2 H), 0.59 — 0.71 (m, 2 H), 1.16 — 1.25 (m, 1 H), 1.70 (d, J=6.4 Hz, 3 H), 3.05 _ 3.16 (m, 2 H), 5.80 (q, J=6.4 Hz, 1 H), 6.62 — 6.70 (m, 2 H), 7.45 (d, J=7.5 Hz, 1 H), 8.16 (d, J=7.2 Hz, 1 H) Co. No. 13-b: 1H NMR (500 MHz, CDC13) 8 ppm 0.27 _ 0.39 (m, 2 H), 0.58 — 0.67 (m, 2 H), 1.12 _ 1.21 (m, 1 H), 1.73 (d, J=6.4 Hz, 3 H), 2.22 (s, 3 H), 3.06 (qd, J=15.4, 6.6 Hz, 2 H), 5.92 (q, J=6.4 Hz, 1 H), 6.71 (d, J=8.4 Hz, 1 H), 6.89 (dd, J=8.4, 1.4 Hz, 1 H), 7.18 (d, J=1.7 Hz, 1 H), 7.32 (d, J=7.2 Hz, 1 H), 8.07 (d, J=7.2 Hz, 1 H) 3O Co. No. 14-b: 1H NMR (500 MHz, CDC13) 8 ppm 0.28 — 0.39 (m, 2 H), 0.57 — 0.69 (m, 2 H), 1.12 — 1.21 (m, 1 H), 1.70 (d, J=6.6 Hz, 3 H), 2.31 (s, 3 H), 3.01 — 3.12 (m, 2 H), .79 (q, J=6.6 Hz, 1 H), 6.55 (dd, J=9.0, 4.3 Hz, 1 H), 6.69 (td, J=8.5, 3.0 Hz, 1 H), 6.87 (dd, J=9.0, 2.9 Hz, 1 H), 7.17 (d, J=7.5 Hz, 1 H), 8.06 (d, J=7.2 Hz, 1 H) Co. No. 20-b: 1H NMR (500 MHz, CDC13) 8 ppm 1.22 (t, J=7.1 Hz, 3 H), 1.72 (d, J=6.4 Hz, 3 H), 3.58 (q, J=7.1 Hz, 2 H), 5.03 — 5.10 (m, 2 H), 5.84 (q, J=6.5 Hz, 1 H), 6.67 _ 6.74 (m, 1 H), 6.81 — 6.88 (m, 2 H), 7.34 (d, .1272 Hz, 1 H), 8.40 (d, J=7.5 Hz, 1 Co. No. 22-b: 1H NMR (500 MHz, CDC13) 5 ppm 1.23 (t, J=6.9 Hz, 3 H), 1.70 (d, J=6.4 Hz, 3 H), 3.58 (q, J=7.0 Hz, 2 H), 5.05 — 5.12 (m, 2 H), 5.81 (q, J=6.6 Hz, 1 H), 6.62 — 6.70 (m, 2 H), 7.48 (d, J=7.5 Hz, 1 H), 8.45 (d, J=7.2 Hz, 1 H) Co. No. 31-b: 1H NMR (400 MHZ, CDClg) 8 ppm 1.07 (t, J=7.40 Hz, 3 H) 1.72 (d, J=6.24 Hz, 3 H) 1.92 (sxt, J=7.63 Hz, 2 H) 2.98 - 3.14 (m, 2 H) 5.84 (q, J=6.47 Hz, 1 H) 6.65 - 6.74 (m, 1 H) 6.78 - 6.89 (m, 2 H) 7.29 (d, J=7.40 Hz, 1 H) 8.02 (d, J=7.40 Hz, 1 H).

In vitro testing of nds of Formula (I-B) The compounds ula (I-B) provided in the t invention are ve allosteric modulators of mGluR2. These compounds appear to potentiate glutamate responses by binding to an allosteric site other than the glutamate binding site. The response ofmGluR2 to a concentration of glutamate is increased when compounds of Formula (l-B) are present. Compounds of Formula (I-B) are expected to have their effect substantially at mGluR2 by virtue of their ability to enhance the function of the 2O receptor. The effects of positive allosteric modulators tested at mGluR2 using the [3SS]GTP1/S binding assay method described below and which is suitable for the identification of such compounds, and more particularly the compounds according to Formula (l-B), are shown in Table E. [35S]GTPyS binding assay The [35S]GTP1/S binding assay is a fianctional membrane-based assay used to study G-protein coupled receptor (GPCR) function whereby incorporation of a non-hydrolysable form of GTP, [35S]GTPyS sine 5’-triphosphate, labelled with gamma-emitting 35 S), is measured. The G-protein 01 subunit catalyzes the exchange of guanosine 5 ’-diphosphate (GDP) by ine triphosphate (GTP) and on activation of 3O the GPCR by an agonist, [3SS]GTP1/S, becomes incorporated and cannot be cleaved to continue the exchange cycle r (1998) Current Protocols in Pharmacology , John Wiley & Sons, Inc.). The amount of radioactive [35S]GTP1/S oration is a direct measure of the activity of the G-protein and hence the activity ofthe t can be ined. mGlu2 receptors are shown to be preferentially coupled to Geri-protein, a preferential coupling for this method, and hence it is widely used to study receptor activation of mGlu2 receptors both in recombinant cell lines and in tissues. Here we describe the use of the [35S]GTPyS binding assay using membranes from cells transfected with the human mGlu2 receptor and adapted from Schaffhauser et a]. (Molecular Pharmacology, 2003, 4:798-810) for the detection of the ve eric modulation (PAM) properties of the nds of this ion.

Membrane preparation CHO-cells were cultured to pre-confluence and stimulated with 5 mM butyrate for 24 h. Cells were then collected by scraping in PBS and cell suspension was centrifuged (10 min at 4000 RPM in benchtop centrifuge). Supernatant was discarded and pellet gently resuspended in 50 mM Tris-HCl, pH 7.4 by mixing with a vortex and ing up and down. The suspension was centrifuged at 16,000 RPM (Sorvall RC-5C plus rotor SS-34) for 10 minutes and the supernatant discarded. The pellet was homogenized in 5 mM Tris-HCl, pH 7.4 using an turrax homogenizer and centrifuged again (18,000 RPM, 20 min, 4 oC). The final pellet was resuspended in 50 mM Tris—HCl, pH 7.4 and stored at —80 0C in appropriate ts before use. Protein concentration was determined by the Bradford method (Bio-Rad, USA) with bovine serum albumin as standard. [35s1GTPys binding assay Measurement ofmGluR2 positive allo steric modulatory activity of test compounds was performed as follows. Test compounds and glutamate were diluted in assay buffer containing 10 mM HEPES acid, 10 mM HEPES salt, pH 7.4, 100 mM NaCl, 3 mM MgClz and 10 uM GDP. Human mGlu2 receptor-containing membranes were thawed on ice and diluted in assay buffer supplemented with 14 ug/ml saponin. Membranes were pre-incubated with compound alone or together with a predefined (~EC20) concentration of glutamate (PAM assay) for 30 min at 30 0C. After on of [35S]GTPyS (f.c. 0.1 nM), assay mixtures were shaken briefly and farther incubated to allow [35S]GTPyS incorporation on activation (30 s, 30 oC). Final assay mixtures contained 7 ug of membrane protein in 10 mM HEPES acid, 10 mM HEPES salt, pH 7.4, 100 mM NaCl, 3 mM MgC12, 10 uM GDP and 2 ug/ml saponin. Total reaction volume was 200 ul. ons were terminated by rapid filtration through ter-96 GF/B plates (Perkin Elmer, Massachusetts, USA) using a 96-well filtermate universal harvester. s were washed 6 times with ice-cold 10 mM NaH2P04/10 mM NazHPO4, pH 7.4. Filters were then air-dried, and 40 ul of liquid scintillation il (Microscint-O) was added to each well. Membrane-bound radioactivity was counted in a Microplate Scintillation and Luminescence Counter from Perkin Elmer.

Data analysis The concentration-response curves ofrepresentative compounds of the present invention -obtained in the presence of ECZO ofmGluR2 agonist glutamate to determine positive eric modulation (PAM)- were generated using the Lexis software interface oped at J&J). Data were calculated as % of the control glutamate se, defined as the maximal se that is generated upon addition of glutamate alone. Sigmoid concentration-response curves plotting these percentages versus the log concentration of the test compound were analyzed using near regression analysis.

The concentration producing half-maximal effect is then calculated as EC50.

The pECso values below were calculated as the —log EC50, when the EC50 is expressed in M. Emax is defined as relative maximal effect (i.e. maximal % effect relative to the control glutamate response).

Table E below shows the pharmacological data obtained for compounds of Formula (LB) and current pharmacological data obtained for compounds of Formulae (I) and (I- A).

Table E: Pharmacological data for compounds according to the invention.

GTPyS - GTPyS - 2 hmGluR2 Co. No. PAM pECso PAM Emax l-b 6.59 296 2-b 6.84 228 3-b 5.79 187 6-b 7.39 256 -b 6.06 141 4-b 7.04 329 7-b 7.31 292 8-b 7.04 244 9-b 7.3 260 -b 7.47 218 11-b 8.25 239 12-b 6.99 178 16-b 7.54 284 13-b 7.75 280 14-b 7.53 281 -b 8.16 293 WO 10435 _ 85 _ GTPyS - GTPyS - hmGluR2 hmGluR2 Co. No. PAM pECso PAM Emax 19-b 6.71 297 -b 6.9 233 24-b 6.42 193 17-b 7.73 317 18-b 6.24 213 22-b 7.61 325 23-b 5.94 167 21-b 6.32 102 -h 7.07 332 26-b 6.78 214 27—b n.c. 51 -h 6.9 227 28-b 7.19 234 29-b 5.85 77 31-b 7.05 251 32-b 5.71 116 1 7.11 258 la 6.95 286 2 7.82 290 2a 7.61 484 3 7.55 212 4 6.88 260 6.26 231 7.79 263 6a 7.68 261 8.45 263 6.73 360 6.9 462 7.21 357 11 6.94 310 12 8.36 261 13 6.9 278 l-a 6.78 314 2015/051029 _ 86 _ GTPyS - GTPyS - hmGluR2 hmGluR2 Co. No. PAM pECso PAM Emax 2-a 6.84 340 3-a 6.88 231 4-21 6.6 269 -21 n.t. 6-a 6.34 255 7-a 6.64 291 8-21 6.04 157 9-21 6.59 222 -21 6.88 290 11-21 7.11 249 12-21 7.03 242 13-21 6.67 212 14-21 6.92 259 -21 7 253 16-21 7.12 223 17-21 6.54 261 18-21 n.t. 19-21 6.71 240 -a 6.91 243 21-a 6.25 207 22-a 6.05 259 23-21 6.58 203 24-a 6.91 258 —a 7.07 261 26-a 6.5 248 27-21 6.48 284 28-a 6.96 297 29-a 6.97 317 -21 n.t. 31-a n.t. 32-21 6.66 347 33-21 6.58 362 no. means that the pECso could not be ated n.t. means not tested pEC50 values were not calculated in cases where the concentration-response curve did not reach a plateau level.

All compounds were tested in presence R2 agonist glutamate at a predetermined ECZO concentration, to determine positive allosteric modulation . pECso values were calculated from a concentration-response experiment of at least 8 concentrations.

B) ANTICONVULSANT STUDIES WITH mGluR2 COMPOUNDS (ORTHOSTERIC AGONIST AND COMPOUNDS OF FORMULAE (I)/(I-A)/(I-B) General Preparation of test compounds and solutions Test compounds were administered using an optimal fluid volume to body fluid ratio.

Test compounds were administered to mice in a volume of 0.01 mL/g of body weight (White H.S., et al., General Principles: Experimental ion, quantification, and evaluation of antiepileptic drugs, in Antiepileptic Drugs, Fourth Edition, R. H. Levy, R.H. Mattson, and B. S. Meldrum, Editors. 1995, Raven Press, Ltd.: New York, pp. 99- l 10). For subcutaneous (s.c.) stration, the test compounds were administered into a loose fold of skin along the back of the animal except compound 6-b, which was administered orally (p.o). For each of the tests performed on the test compounds (except on compound 6-b), final compound trations were stered as aqueous on in 20% Hp-B-CD. For compound 6-b, a 40% Hp-B-CD stock solution was first prepared and utilized for formulating nd 6-b at the desired concentrations for testing via the oral route; final compound concentrations were administered as suspensions in 20% Hp-B-CD. A 20% Hp-B-CD on was used for the vehicle groups.

For LY-404039, final compound concentrations were administered as a saline solution S.C..

For compound CAS 10924530, final compound concentrations were administered in 10% Hp-B-CD (+NaCl) vehicle following dissolution.

Final levetiracetam concentrations were administered in a 0.5% cellulose (MC) aqueous solution administered by eritoneal (i.p.) injection.

Critical Reagents a) Vehicle Solutions 0.5% Methylcellulose (MC) 40% Hydroxypropyl-B-cyclodextrin (Hp-B-CD) stock solution [9) laneous Solutions Tetracaine (0.5% solution w/v) was added dropwise from a plastic dropper bottle onto the eyes of all animals that would subsequently receive electrical stimulation via corneal electrodes.

Animals and Animal Husbandry Adult male CF No l albino mice (26-35 g) were obtained from Charles River, e, Michigan. The animals were maintained on an adequate diet b RMH 3000) and allowed free access to food and water, except during the short time they were removed from their cage for testing. Animals newly received in the laboratory were allowed ient time to correct for possible food and water restriction incurred during transit before being employed in testing. All mice were housed in plastic cages in specially constructed rooms with controlled humidity, exchange of air and controlled lighting (12 hours on — 12 hours off). The animals were housed, fed, and handled in a manner consistent with the recommendations in the National Council Publication, "Guide for the Care and Use of Laboratory Animals".

Minimal Motor Impairment (MMI) Acute MMI was assessed by a combination of direct observations of the animal for overt symptoms of the animal’s ogical or muscular fianction. In mice, the rotarod procedure was used to disclose l ar or neurological impairment. When a mouse is placed on a rod that rotates at a speed of 6 rpm, the animal can maintain its equilibrium for long periods of time. The animal was considered toxic if it fell off this rotating rod three times during a l min period.

Determination of Median Effective and Toxic Doses (EDfl and TDfl) In the determination of an ED50 or TD50 for each test compound, the first dose administered is usually the same dose as that used in a successful TPE determination.

If the initial dose employed was effective or toxic in more than 50% of animals, the next dose would be one-half that of the initial dose; if the l dose was effective or toxic in less than 50% of animals, the following dose would be twice that of the initial dose. Third and fourth doses were ed to produce an evenly spaced dose response line. There should be a minimum of 4 points either including or lying between 0 and 1 00%.

TPE Determination Groups of generally four animals each were stered test compounds and each group was tested at one of five time points: 0.25, 0.5, 1, 2, or 4h post-treatment (White et al. 1995). TPE was determined using the 6Hz (32mA) assay. The time (0.25, 0.5, 1, 2, or 4h post-treatment) at which maximal protection was observed was considered the Time ofPeak Effect (TPE).

At the TPE determined for this study, or determined previously, compounds were tested in the 6Hz assay (32 and/or 44 mA), across several doses and comprising doses that elicited little or no protection to full protection.

An ED50 and 95% confidence interval (C.I.) were calculated using Probit analysis on a computer program ed in the laboratory (Finney t Analysis" 34d Ed 1971, London: Cambridge University Press).

Serum Collection for pK/pD Analysis In various tests, animals were sacrificed ing testing, and trunk blood and/or brain tissue (whole brains) was collected for quantification of drug levels. Innnediately after testing, animals were tated and trunk blood was collected into a BD Vacutainer® tube containing K2EDTA and chilled on ice until centrifiagation. Following centrifiagation (13000 — 18000 rpm, 5-7 min), the plasma was removed and transferred to a labeled microcentrifuge tube and stored at -80 0C. For brain tissue collection, brains were removed immediately following tation and flash frozen. The frozen sample was placed in a labeled centrifuge tube and stored at -80 oC. 6 Hz Psychomotor Seizure Test in Mice The 6Hz seizure test is used as a model of pharmacoresistant limbic seizures. The 6Hz seizure ys a resistance to phenytoin, carbamazepine, lamotrigine, and topiramate n et al. "Pharmacological characterization of the 6 Hz psychomotor seizure model ofpartial epilepsy" Epilepsy Research 2001, Vol. 47, pp. 217-222).

Method for 6 Hz Psychomotor Seizure Test Focal seizures were induced in mice via corneal stimulation (6Hz, 0.2 msec rectangular pulse, 3 sec duration; Barton et al. 2001). Mice were tested at either 32mA or 44mA.

Prior to stimulation, drops of 0.5% tetracaine were d to each eye. The seizures that arise from l stimulation in this assay are characterized by a minimal clonic phase ed by stereotyped automatistic behaviors including stun, forelimb clonus, twitching of the vibrissae, and -tail. Animals not ying these behaviors were considered protected.

EXAMPLE 1 — STUDIES WITH COMPOUNDS 1 AND 2 1.1. Combination Study with Co. No. 1, Co. No. 2 and Levetiracetam First, each compound was tested individually at a dose that displayed l activity in the 6Hz 44 mA test at each compound’s TPE. When the mGluR2 PAM compounds and levetiracetam were administered in combination (same dose and time-point as individual tests) nearly complete protection was observed in the 6Hz 44 mA test (Table 2). In addition to recording the efficacy and toxicity data for these compounds alone or in combination, both plasma and brain samples were collected from each of the groups for pharmacokinetic/pharmacokinetic analysis. No cokinetic interaction was observed based on compound levels in the plasma and brain samples (data not shown).

In summary, compounds 1 and 2 displayed ve pharmacodynamic interaction with levetiracetam in the 6Hz model that does not appear to be due to pharmacokinetic interaction, and without increasing motor impairment (Tables 2, 2a, 2b). The effect of 1 dose of Compound 2 was also tested on the dose-response of LEV. As shown in Table 3, there was a ~200-fold shift in the ED50 ofLEV ed to when LEV was tested alone. LEV seemed to increase the potency ofCo No. 2 slightly (Table 3). 1.2. Isobolographic analysis of interactions between Co. No. 1 and Levetiracetam in the 6 Hz seizure model Isobolographic studies were conducted for the ed stration of Co. No. 1 with LEV in the 6Hz (44mA) assay. Studies were conducted according to previously described methods (Madsen et al. 2011). Initial EDso values were determined for both Co. No. 1 and LEV and used to calculate theoretical ED50 (i standard error of the mean, SEM) values for three fixed dose ratio combinations (LEV: Co. No. 1): 1:3, 1:1, and 3:1. Doses used were proportional to calculated ED50 values. For example, the .9]. dose ratio used for the 1:1 paradigm was based on 0.5 x ED50 for LEV and 0.5 x ED50 for Co. No. 1. Similarly, the 1:3 paradigm used 0.25 x ED50 for LEV and 0.75 x EDso for Co. No. 1. The 3:1 dose ratio used 0.75 x ED50 LEV and 0.25 x ED50 for Co. No. 1.

Experimental treatment doses (see Table 4) were based on theoretical values and adjusted ing to ed effects. Experimentally determined ED50 (i SEM) values for each fixed dose-ratio combination were compared to the theoretical values (t-test) for statistical purposes. The dose ratio was determined to be supra-additive (synergistic) if the mentally-determined ED50 value was significantly lower than the theoretical ED50. Subsequently, the experimental combined doses were determined for the same paradigms in the 6Hz seizure test (Table 4 below). The isobolographic study with compound 1 and levetiracetam in the 6 Hz model demonstrates a significant synergistic codynamic interaction at all dose ratios evaluated and corresponds closely with compound 1 plasma levels. Furthermore, no motor impairment was observed at any of the dose ratios evaluated suggesting that the synergistic pharmacodynamics interaction does not produce increased motor ty. 1.3. Mouse Corneal ng Model and studies with compound 1 Mice were kindled electrically with 3 , 3 mA, 60 Hz stimulus, twice daily using corneal electrodes until a criterion of 5 utive Stage 5 seizures as defined by Racine (Racine "Modification of seizure ty by electrical stimulation" 11. motor seizure" Electroenceph Clin Neurophysiol 1972, 32, pp. 281-294). After the mice reached a stable kindled state, the test compound or vehicle was administered and, at the previously determined TPE, each animal was given the electrical stimulus indicated above. Following stimulation, the animals were observed for the presence or absence ofthe seizure activity scored on the Racine scale (0 — 5) with 5 representing the t stage rearing and g. One dose of LEV and two doses of Co. No. 1 were tested individually and in combination against corneal kindled seizures. Combination of compound 1 with levetiracetam in this model suggests a positive pharmacodynamics interaction (Table 5 below).

A summary ofthe data for the compounds tested alone is presented in Table l and additional s of studies performed according to example 1 are listed in Tables 2-5 below.

Table 1: Summary of the acute anticonvulsant data in the 6Hz model at 32 mA and 44 mA for the mGluR2 PAM compounds 1, 2, 11, 2-a, 25-a, 6-b and LY- 404039 following s.c. stration (except compound 6-b, which was tested p.0.).

TPE means time of peak effect, CI means confidence interval, s.c. means subcutaneous, p.o. means orally, n.t. means not tested. TPE was determined in 32 mA 6Hz test.

Effects are generally observed at doses that do not e impairment in rotarod test.

For compounds 11 and 2-a the individual values of repeat experiments are provided.

For compound 25a, both 0.25 and 1h time points were used for 6Hz (44mA) studies.

El)50 (95% CI) mg/kg, s.c.

Co. No. TPE (h) scfffiggie) Corneal 32 mA 44 mA kindling 4.77 (3.54 — 2.8 11 0.5 6.76) 31.5 (15.1 — 47.3) (100 mg/kg) 9.41 15.1) 3.83 (1.62— 3.4 2 0.25 5.89 (3.89 — 8.45) 6.71) (40 mg/kg) 1 0.5 2.8 (1.3 — 4.3) 10.2 (3.1 — 12.4) (20 mg/kg) 1 hr TPE: 25.9 n.t. -a 1 33.7) 7.7 8.4) 025 hr TPE: 29.1 (21.6-39.6) 44.7 (23.4-80.5) 50% protection at 4.4 2-a 0.5 20.8 (10.0-31.7) 100 mg/kg (100 mg/kg) 12.2 (8.4—17.4) 21 (179—274) 6-b 0.5 7.2 (4211.8) 16.1 (13.0—20.1) n.t.

LY-404039 0.5 10.2 (3.62-12.4) n.t. (100 mg/kg) Table 1a: Summary of the 6Hz 32 mA TPE determination for Co. No. 1 Dose (mg/kg, s.c.) Time (h) 6Hz 32 mA Motor impairment 4 0/4 0/0 2 0/4 0/0 1 3/4 0/0 0.5 4/4 0/0 0.25 4/4 0/0 0.5 8/12 0/0 0.25 8/12 0/0 0.5 5/8 0/0 0.25 1/8 0/0 (number of mice protected in 6Hz or toxic on rotarod/number tested) Table 1b: Dose-response studies for Co. No. 1. The TPE for Co. No. 1 was previously ined to be 0.5 h (results shown above in table 1a). Several doses of Co. No. 1 were administered at this TPE and tested in the 6Hz assay, using both 32 and 44 mA stimulus intensities.

Dose (mg/kg, #rotarod motor Test #protected/#tested s.c.) ment/#tested. , 6Hz 32 mA 20 8/8 1/8 7/8 0/8 8/12 0/ 12 2.5 7/ 16 0/ 16 0.5 1/8 0/8 ED50 (95% CI): 2.8 mg/kg (1.3 to 4.3) 6Hz 44 mA 20 8/8 1/8 7/8 0/8 4/8 0/8 2.5 0/8 0/8 ED50 (95% CI): 10.2 mg/kg (3.1 to 12.4) Table 2: Summary of interaction of Co. No. 1 and Co. No. 2 with Levetiracetam (LEV) in the mouse 6Hz, 44 mA seizure model. Results are listed as number of mice exhibiting filll protection/total number of mice tested in each dosing group (at the specified test compound or combination dosage levels).

Dose Time (h) # protected / # # motortox / # tested tested LEV 10 mg/kg i.p. 1 1/6 0/6 Co. No. 2 + 3 mg/kg s.c. 0.25 5/6 0/6 Co. No. 2 3 mg/kg s.c. 0.25 1/6 0/6 LEV 10 mg/kg i.p. 1 1/8 0/8 Co. No. 1 + 2.5 mg/kg s.c. 0.5 6/8 0/8 Co. No. 1 2.5 mg/kg s.c. 0.5 0/8 0/8 Table 2a: Plasma and brain levels Co. No. 1. in combination study with Levetiracetam (LEV). BQL means below quantifiable limit.

Plasma Plasma 6 Hz Co. No. 1 LEV Co. No. 1 ) (ng/ml) Protecti¢ 6 Hz 44 mA 10 mg/kg 9350 2.5 mg/kg BQL Yes 85 80 244 No 10900 3 14 Yes 10300 3 82 Yes 9780 416 Yes 9780 377 Yes 13 700 2260"< No 10100 607 Yes Mean Plasma 657. 1 103 11 6/8 Level (390) Mean Plasma Levels (non- 1/8 8254 0/8 438 combination) Mean plasma level shown in parenthesis ( ) is calculated with a statistical outlier* removed Table 2b: Plasma and brain levels Co. No. 2 in combination study with Levetiracetam (LEV). AQL means above fiable limit.

Co. No. 2 LEV Plasma Brain Co. No. Plasma Brain 6 Hz (ng/ml) (ng/ml) 2 (ng/ml) (ng/ml) Protection 6 Hz 44 mA 10 6450 6290 3 1830 1540 Yes mg/kg mg/kg 8200 7990 386 1020 Yes 3540 4760 4700 1310 Yes 3850 NA 467 NA No 7150 6380 AQL 1120 Yes (>500) 3890 3960 2080 1140 Yes Mean 5513 5876 1893 1226 5/6 Plasma / Brain Levels Mean 1/6 8750 5773 1/6 1295 1113 Plasma / Brain Levels (non- combination) NA — sample not available for analysis Table 3: 6 Hz seizure (44mA) model ED50 determinations for No. Co. 2 and levetiracetam (LEV) alone and in combination. LEV at a dose of 10 mg/kg increased the potency of the No. Co. 2 (~5-fold shift in ED50). Co. No. 2 at a dose of 3 mg/kg increased both the y (to 100% protection) and potency of LEV (~200- fold shift in ED50).

Figure 1 shows the dose-response for the 6 Hz 44mA ED50 determinations for the Co.

No. 2 and LEV alone and in combination. 2015/051029 _ 96 _ Treatment ED50 (95% CI) Maximum Effect mg/kg (% Protection) Co. No. 2 alone 6.97 100% (5.44 — 8.30) Co. No. 2 1.35 100% + LEV (10 rug/kg) (0.8 — 1.9) LEV alone ~ 200 75% LEV 1.0 100% + Co. No. 2 (3 nag/kg) (0.23 — 2.24) Table 4: Results of Co. No. 1 and racetam in Isobolographic Study.

Co. No. 6Hz LEV comblne. Rotarod 1 (44mA) Group (mg/kg f f d dose #motortox . (mg/kg #protected 1.p.) (mg/kg) /#tes et d s.c.) /#tested 181 5.1 93.1 0/8 8/8 11 90.5 2.6 46.6 0/8 6/8 0.5 0.5 Paradlgm, 45.3 1.3 23.3 0/8 3/8 22.6 0.6 11.6 0/8 3/8 EDso (95% CI; mg/kg): 22.2 (8.4-35.7) 45.3 3.8 14.2 0/8 8/8 22.6 .25 1.9 .75 , 7.1 0/8 4/8 parad1grn 11.3 1.0 3.6 0/8 2/8 EDso (95% CI; mg/kg): 5.9 (3.5-8.7) 271.5 2.6 204.3 0/8 8/8 3.1 135.8 1.3 102.2 0/8 3/8 .75 .25 Paradlgm_ 67.9 0.6 51.1 0/8 3/8 33.9 0.3 25.5 0/8 0/8 EDso (95% CI; mg/kg): 86.3 (56.8-131.4) The isobolographic analysis (Figure 2) demonstrates that the combination of Co. No. 1 and levetiracetam results in a cantly positive synergistic effect.

Table 5: s of Co. No. 1 and Levetiracetam combination study in the corneal kindling model in mice. # protected/# % Mean Seizure nd(s) tested Protected Score Vehicle (20% HPBCD@30’, s.c.; 0.5% 0/10 0% 4.7 MC@60’, i.p.) LEV 3 mg/kg 5/13 38% 3.3 Co. No. 1 30 mg/kg 3/12 25% 4.0 LEV 3 mg/kg & Co. No. 1 30 /10 100% 0.6 mg/kg Co. No. 1 20 mg/kg 5/16 31% 3.7 LEV 3 mg/kg & Co. No. 1 20 7/10 70% 1.9 mg/kg 0 to 5 Racine Seizure 0 = no seizure activity Score = l seizure activity EXAMPLE 2 — STUDIES WITH COMPOUNDS 25-a AND 2-a 2.1. Combination Study with Co. No. 25-a and Levetiracetam Independent dose-response s were performed in the 6 Hz 44mA test for both compounds to determine EDso values at the TPE of l h i.p. for levetiracetam and l h s.c. for Co. No. 25-a. The ED50 value for Co. No. 25-a was 25.9 mg/kg and for levetiracetam the value was estimated to be approximately 345 mg/kg. The dose- response for levetiracetam was repeated with co-administration of 10 mg/kg Co. No. -a (a dose of Co. No. 25-a that alone did not protect in the 6 Hz 44mA model). The co-administration of 10 mg/kg Co. No. 25-a produced an ED50 in the levetiracetam dose-response of 4.9 mg/kg (~70-fold lower compared with levetiracetam alone) and antly yielded fiall protection in the 6Hz 44mA seizure model. These results are suggestive of a positive pharmacodynamic interaction in the 6Hz seizure model between Co. No. 25-a and levetiracetam.

Table 6: Time-to-Peak Effect Determination for Co. No. 25-a in the 6Hz (32mA) Assay. Two doses were used in this study, 10 and 20 mg/kg, across several time points (0.25-4h). The nd showed the greatest degree of protection in the 6Hz assay between 0.25 and 1h, which was more evident at 20 mg/kg. Plasma levels of the compound generally corresponded to behavioural seizure protection. A TPE of 0.25h was used for 6Hz (32 mA) studies s both the 0.25 and 1h time points were used for 6Hz (44mA) studies. s.c. means subcutaneous Dose # rotarod motor Co. No. 25-a mean Time. # protected/# (mg/kg, impalrment / #. plasma levels (h) tested s.c.) tested ) 0.25 2/4 0/4 10,983 (2,477) 0.5 1/4 0/4 3,330 1 1/4 1/4 700 2 0/4 0/4 256 4 0/4 0/4 40 0.25 4/4 0/4 4,095 0.5 3/4 1/4 2,800 1 4/4 1/4 1,765 2 1/4 0/4 618 4 1/4 1/4 28 Mean plasma level shown in parenthesis ( ) is calculated with a statistical outlier removed. 2015/051029 Table 7: Dose-Response Studies for Co. No. 25-a in the 6Hz Assay (32 mA21 and 44 mAb) CI means nce interval Test Dose # protected/ # rotarod motor Co. No. 25-a mean (mg/kg, # tested ment / # plasma levels s.c.) tested (ng/mL) 6Hz 32 mA 20 8/8 0/8 5,570 3/8 0/8 1,201 4/8 0/8 6,113 4/8 0/8 2,558 1 1/8 0/8 466 EDso (95% CI): 7.7 mg/kg (2.3 to 18.4) 6Hz 44 mA 40 7/8 0/8 6,263 3/8 0/8 7,220 2/8 0/8 3,368 0/8 0/8 4,345 (1,526) 0/8 1/8 1,428 ED50 (95% CI): 29.1 mg/kg (21.6 to 39.6) aThe time-to-peak effect in the 6Hz 32mA assay for Co. No. 25-a was determined to be 0.25 h (see Table l). bThe time-to-peak effect in the 6Hz 44 mA assay for Co. No. 25-a was similar for 0.25 h and 1 h; results for 1h confirmed the ED50 (95% CI) 25.9 (15.5 — 33.7) (see Table 1 and 6).

Mean plasma level shown in parenthesis ( ) is calculated with a statistical outlier removed.

Table 8: Combination Studies for Co. No. 25-a with Levetiracetam (LEV) in the 6Hz (44 mA) Assay.

Drug Dose (mg/kg, s.c.) # protected / # rotarod motor # tested impairment / # tested LEV 200 2/8 0/8 400 4/9 0/9 800 10/12 0/ 12 ED50 (95% CI): 345.4 mg/kg (211.0 to 485.3) Drug Dose (mg/kg, s.c.) # protected / # d motor # tested impairment / # tested LEV + Co. No. 25-a 200 8/8 1/8 mg/kg 100 7/8 2/8 50 5/8 1/8 4/8 0/8 1 4/8 1/8 ED50 (95% CI): 4.9 (0.0 — 14.2) Co. No. 25-a (s.c.) 10 mg/kg tested in combination with LEV (i.p.) - Co. No. 25—a 10 mg/kg, not active when administered alone. 2.2. Combination Study with Co. No. 2-a and Levetiracetam Dose-response studies were med in the 6 Hz 32 mA and 44mA tests (table 9 below) and in the combination test with levetiracetam (effect of Co. No. 2-a on the dose-response 0f LEV in tables 10a and effect ofLEV on the dose-response of Co. No. 2-a in table 10b below) in the same manner as described for the studies with Co. No. -a and levetiracetam above.

Table 9: Dose-Response Studies for Co. No. 2—a in the 6Hz Assay (32 mA and 44 mA; 0.5 h TPE). A time-to-peak effect of 0.5 h was determined in the 32 mA 6 Hz test (s.c.) and used for 6Hz (32 mA and 44 mA) studies. # 1313:2331 / # Test Dose (mg/kg, s.c.) @3332?gotteosrted 6Hz 40 8/8 2/8 32 mA 6/8 3/8 4/8 0/8 0/8 0/8 2. 5 0/8 1/8 ED50 (95% CI): 12.2 mg/kg (8.4 to 17.4) 2015/051029 # protected / # # rotarod motor Test Dose (mg/kg, S'C') tested impairment / # tested 6Hz 40 8/8 4/8 44 "1A 3/8 0/8 3/8 0/8 2/8 1/8 0/8 1/8 0/8 0/8 ED50 (95% CI): 21.0 mg/kg (17.9 to 27.4) TDSO: > 40 mg/kga a40 mg/kg — 6 out of 16 total (32 mA and 44 mA combined) with impairment.

Dose selected for combination s with LEV in 6Hz (44mA): Co. No. 2-a 10 mg/kg.

Table 10a: Combination Studies for Co. No. 2-a with Levetiracetam (LEV) in the 6Hz (44 mA) Assay. Combination of 10 mg/kg Co. No. 2-a with varying doses of levetiracetam.

Drug mung/kg) "12:52?" 11.135331213333101 200 2/8 0/8 LEV 400 4/9 0/9 800 10/ 12 0/ 12 LEV ED50 (95% CI): 345.4 mg/kg (211.0 to 485.3) 200 6/8 1/8 100 6/8 0/8 50 6/8 0/8 LEV + Co. No. 2-a 25 8/8 0/8 mg/kga 12.5 5/8 0/8 6.25 4/8 0/8 3.125 3/8 1/8 1.5625 0/8 0/8 LEV ED50 (95% CI): 9.6 mg/kg (1.7 — 21.9) aCo. No. 2-a (s.c.) 10 mg/kg tested in combination with LEV (i.p.); Co. No. 2—a 10 mg/kg, not active when administered alone. onal LEV (low-dose) control groups were tested at 25 and 6.25 mg/kg (1/8 and 0/6 ted, respectively).

Vehicle-treated mice (0.5% methylcellulose i.p. (lh) / 20% HPBCD s.c. (0.5h)) showed no protection (0/8 protected).

Table 10b: ation Studies for Co. No. 2—a with Levetiracetam (LEV) in the 6Hz (44 mA) Assay. Combination of 350 mg/kg levetiracetam with varying doses of Co. No. 2-a. # rotarod motor # protected / # Drug Dose (mg/kg) impairment / # tested tested LEV (alone)a 350 3/8 0/8 8/8 2/8 LEV 350 mg/kg + Co. No. 10 7/8 1/8 2-a 5 7/8 1/8 2.5 5/8 0/8 1.25 4/8 0/8 previous Co. No. 2-a ED50 (95% CI): 21.0 mg/kg (17.9 to 27.4) LEV combination Co. No. 2—a ED50 (95% CI): 1.5 mg/kg (0.1 — 2.7) ~14-fold shift in potency aLEV ED50 (presented tely) previously determined in 6Hz (44 mA): 345 mg/kg. bCo. No. 2-a (s.c.) 10 mg/kg tested in combination with LEV (i.p.); Co. No. 2-a 10 mg/kg, not active when administered alone. onal LEV (low-dose) control groups were tested at 25 and 6.25 mg/kg (1/8 and 0/6 protected, respectively).

Vehicle-treated mice (0.5% methylcellulose i.p. (lh) / 20% HPBCD s.c. (0.5h) showed no protection (0/8 protected).

At a dose of 10 mg/kg s.c., Co. No. 2-a increases the y of LEV, leading to an approximate 35—fold shift in the EDso. This suggests a positive pharmacodynamic relationship (Table 10a). At a dose of 350 mg/kg i.p., LEV increases the potency of Co. No. 2-a, leading to an approximate 14-fold shift in the ED50. This suggests a positive pharmacodynamics relationship (Table 10b). 2015/051029 EXAMPLE 3 — S WITH COMPOUND 6-b 3.1. Combination Study with Co. No. 6-b and Levetiracetam Independent dose-response studies were performed in the 6 Hz 44mA test for both compounds to determine ED50 values at the TPE of l h i.p. for levetiracetam and 0.5 h p.o. for Co. No. 6—b. The ED50 value for Co. No. 6—b was 16.1 mg/kg and for levetiracetam the value was estimated to be imately 345 mg/kg. The dose- se for levetiracetam was repeated with co-administration of 10 mg/kg Co. No. 6- b (a dose of Co. No. 6-b that alone did not protect in the 6 Hz 44mA model). The co- administration of 10 mg/kg Co. No. 6—b produced an ED50 in the levetiracetam dose- response of 2.4 mg/kg (~100-fold lower compared with levetiracetam alone) and importantly yielded full protection in the 6HZ 44mA seizure model. These results are suggestive of a positive pharmacodynamic interaction in the 6HZ seizure model between Co. No. 6-b and levetiracetam.

The results of the studies performed with compound 6-b are listed in Tables 11-13 below.

Table 11: Time-to-Peak Effect Determination for Co. No. 6-b (p.o.) in the 6HZ (32mA) Assay. # rotarod motor Dose (mg/kg, p.o.) Time (h) # ted / # tested impairment / # tested 0.25 1/4 0/4 0.5 3/4 0/4 1 0/4 0/4 2 1/4 0/4 4 0/4 0/4 0.25 4/4 0/4 0.5 3/4 0/4 1 4/4 0/4 2 0/4 0/4 4 1/4 0/4 TPE determined to be 0.5h.

WO 10435 —104— Table 12: Dose-Response Study for Co. No. 6—b in the 6Hz Assay (32mA and 44mA; 0.5h TPE). # rotarod motor # protected / # Test Dose (mg/kg, p.o.) 1mpa1rment/ #. . tested tested 6Hz 32mA 20 7/8 0/8 6/8 0/8 2/8 0/8 2.5 1/8 0/8 ED50 (95% CI): 7.2 mg/kg (4.2 to 11.8) 6Hz 44mA 40 8/8 0/8 6/8 0/8 4/8 0/8 0/8 0/8 ED50 (95% CI): 16.1 mg/kg (13.0 to 20.1) Table 13: Combination Studies for Co. No. 6-b with LEV in the 6Hz Assay (44mA). # protected / # # rotarod motor Drug Dose (mg/kg) tested impairment / # tested LEV 200 2/8 0/8 400 4/9 0/9 800 10/12 0/ 12 ED50 (95% CI): 345.4 mg/kg (211.0 to 485.3) LEV + Co. No. 200 8/8 0/8 6-b 10 mg/kg 100 8/8 0/8 50 5/8 0/8 # protected / # # d motor Drug Dose (mg/kg) tested impairment / # tested 5/8 0/8 1 5/8 0/8 ED50 (95% CI): 2.4 (0.0 — 6.4) Co. No. 6-b (p.0.) 10 mg/kg tested in combination with LEV (i.p.) Co. No. 6-b 10 mg/kg, not active when administered alone EXAMPLE 4 —— STUDIES WITH COMPOUND LY404039 3.1. Combination Study with LY404039 and Levetiracetam LY-404039 was tested alone and in combination with levetiracetam according to the procedures already described hereinabove. The results of the s performed with LY-404039 are listed in tables l4-15.

Table 14: Dose-Response Studies for LY404039 in the 6Hz Assay (32 mA and 44 mA). A time-to-peak effect of 0.5 h was determined in the 32 mA 6 Hz test (s.c.) and used for 6Hz (32 mA and 44 mA) studies.

Dose (mg/kg, # ted / # # rotarod motor Test s.c.) tested impairment / # tested 6Hz 32mA 40 8/8 l/8 6/8 l/8 5/8 0/8 1/ 16 1/16 ED50 (95% CI): 10.9 mg/kg (7.8 to 15.9) 6Hz 44mA 40 7/8 2/8 7/8 l/8 3/8 l/8 0/16 0/16 ED50 (95% CI): 14.1 mg/kg (10.0 to 20.6) TDSO: > 40 mg/kga a40 mg/kg — 3 out of 16 total (32 mA and 44 mA combined) with impairment.

Note: no activity observed ing vehicle administration in 32 or 44 mA. -lO6- Dose selected for combination s with LEV in 6Hz (44 mA): LY404039 5 mg/kg.

Table 15: Combination Studies for LY404039 with Levetiracetam (LEV) in the 6Hz (44 mA) Assay. # protected / # # rotarod motor Drug Dose (mg/kg) tested impairment / # tested LEVa 200 2/8 0/8 400 4/9 0/9 800 10/12 0/12 LEV ED50 (95% CI): 345.4 mg/kg (211.0 to 485.3) LEV + 200 8/8 0/8 "404033 5 50 6/8 1/8 mg/kg 6/8 2/8 2/8 1/8 LEV ED50 (95% CI): 12.8 mg/kg (2.5 — 25.2) aLEV alone shown previously, confirmation doses performed in combination with Co.

No. 2-a (see previous table above). 039 (s.c.) 5 mg/kg tested in combination with LEV (i.p.); LY404039 5 mg/kg was not active when stered alone. onal LEV (low-dose) control groups were tested at 25 and 6.25 mg/kg (l/8 and 0/6 protected, respectively).

Vehicle-treated mice (10% sterile water — NaCl; s.c., 0.5 h TPE and 0.5% MC, i.p., lh TPE) showed no protection or rotarod impairment.

At a dose of 5 mg/kg LY404039 increases the potency ofLEV, leading to an approximate 27—fold shift in the ED50. This suggests a positive pharmacodynamic relationship.

EXAMPLE 5 – REFERENCE STUDIES WITH COMPOUND CAS 10924530 54.1. Combination Study with 2,3-dihydromethyl[3-(1-piperazinylmethyl)-1,2,4- zolyl][[4-(trifluoromethoxy)phenyl]methyl]-1H-isoindolone [CAS 10924530] (described in WO 2008150233, WO 2011084098) and Levetiracetam CAS 10924530 was tested alone and in combination with levetiracetam according to the procedures already described hereinabove. The results of example 5 are listed in tables 16- Table 16: esponse Studies for CAS 10924530 in the 6Hz Assay (32 mA).

Dose # protected / # rotarod motor Time (h) , s.c.) # tested impairment / # tested 0.25 1/4 0/4 0.5 0/4 0/4 1 1/4 0/4 2 0/4 0/4 4 0/4 0/4 0.25 1/4 0/4 0.5 1/4 0/4 40 1 1/4 0/4 2 0/4 0/4 4 0/4 0/4 0.25 0/4 0/4 80 0.5 0/4 0/4 1 1/4 1/4 Low activity was observed at doses and time points tested. Greatest activity at 0.25-1 h in tested doses. Combination studies were performed using 20 mg/kg, sc, lh TPE in the 6Hz (44 mA) assay.

Table 17: Combination Studies for CAS 10924530 with Levetiracetam (LEV) in the 6Hz (44 mA) Assay.

LEV Dose # protected / # # rotarod motor Drug (mg/kg) tested impairment / # tested 200 2/8 0/8 LEVa 400 4/9 0/9 800 10/ 12 0/ 12 LEV ED50 (95% CI): 345.4 mg/kg (211.0 to 485.3) [CAS 1092453— 0/8 0/8 -0] (20 mg/kg, alone) 400 4/8 0/8 200 5/8 0/8 LEV + [cAS 1092453-15g0] 50 3/8 0/8 mg/kg 2/8 0/8 1/8 1/8 LEV ED50 (95% CI): 238.9 mg/kg (41.6 — above highest dose tested) aAdditional LEV (low-dose) control groups were tested at 25 and 6.25 mg/kg (1/8 and 0/6 protected, respectively). b[CAS 10924530] 20 mg/kg (s.c.; lh TPE) tested in combination with LEV (i.p.; lh TPE); [CAS 10924530] 20 mg/kg displayed low activity when administered alone (6Hz, 32 mA), and it was not tested in 6Hz (44mA). This compound displayed an in vitro EC50 = 562 nM (Emax = 197%) when tested in the GTPyS assay bed hereinbefore and no ncy was observed in ex vivo experiments in rats.

Note: e-treated animals (10% HPBCD-NaCl, s.c., l h and 0.5% MC, i.p., lh) showed no protection or motor impairment, N=8.

The current data set tes that mGlu2 PAM or agonist molecules have anti— convulsant ty in the 6Hz animal model. Tested mGlu2 PAMs with EC50 potencies £150 nM (as determined in the [3SS]GTPyS assay), appropriate PK parameters and brain penetration, showed activity in both the 32 and 44 mA 6Hz paradigm. Furthermore, all the tested molecules showed synergistic effects with LEV.

In st, molecule CAS 30, which was only weakly active (EC50 562 nM) in vitro, did not show activity in either of the 6Hz tests, and also did not display synergy with LEV.

Importantly, the data indicate that, under conditions of comparable PK characteristics and riate brain penetration, the most potent mGlu2 PAMs, based on in vitro EC50 values, also appeared most potent in viva, suggesting that in vitro and in viva potency can be linked. Moreover, synergistic effects with LEV were consistently seen with mGlu2 PAM doses similar to the ED50 obtained in the 32 mA model or at least 2-fold lower as the ED50 determined in the 44 mA paradigm (i.e. a dose inactive in the 44mA test when the molecules were tested alone).

Also for LY404039, the mGlu2/3 agonist, ty in both 6Hz tests was seen and synergy was seen at a dose 3-fold lower than the ED50 ined in the 44 mA model, which was inactive when tested alone.

Based on the ble preclinical data in the 6Hz 44mA model, it seems that combining a potent SV2A ligand and a potent mGlu2 PAM, leads to a decrease in the median effective dose or EDSO ofthe SV2A ligand, such as LEV, between 35 and 100- fold. 2O Thus, while not wishing to be bound by theory, it is suggested that positive allosteric modulator of metabotropic glutamatergic receptor subtype 2 (mGluR2 PAM) compounds, in particular mGluR2 PAM compounds having an EC50 potency of £150 nM (as determined in the [3SS]GTPyS assay), wherein EC50 is the concentration producing half-maximal effect in a concentration-response curve obtained in the presence of ECzo of glutamate, and appropriate PK parameters and brain penetration, result in a synergistic combination with an SV2A ligand, in ular levetiracetam, at non-effective doses of one or both of compound (a) and compound (b) of the combination of the invention.

Thus, in a fiarther embodiment, the positive allosteric modulator of metabotropic 3O atergic receptor subtype 2 (mGluR2 PAM) compound of the combination of the invention as defined herein is selected from an mGluR2 PAM compound having an ECSO y of £150 nM (as determined in the [3SS]GTPyS assay), n EC50 is the concentration producing half-maximal effect in a concentration-response curve obtained in the presence ofECZO of glutamate.

PROPHETIC EXAMPLES A) DOMINANT-SUBMISSIVE RELATIONS (DSR) IN RAT IN VIVO ASSAY The DSR assay is divided into two models: Reduction of Dominant Behavior Model (RDBM) ofmania and Reduction of Submissive Behavior Model (RSBM) of depression. The RDBM, wherein the dominant animals are treated with test compound, is predictive of the ability of the test compound to treat mania. The RSBM, n the submissive animals are d with test compound, is predictive of the ability of the test compound to treat sion.

Male Sprague Dawley rats (140 to 160g) from Charles River tories Wilmington, MA are used in this assay. Shipments of rats are received at ek intervals. Each shipment will go through five-day tine, one-week acclimation period and one- week selection process, followed by five-weeks of drug or vehicle treatment to those pairs selected.

Rats will be housed four per cage. Access to food will be restricted to one hour per day after testing on Monday through Thursday. After testing on Friday, rats will have free access to food until being fasted again on Sunday. At no time will the rats be ed ofwater. The food deprivation periods used will have little effect on weight gain as the average weight of rats will be about 300g by the end of the study. At the conclusion of experiment rats will be sacrificed by tation, the trunk blood and brains will be collected for in vitro experiments and drug concentration ements.

The basic testing apparatus consisted of two chambers connected with a tunnel only large enough to allow one rat to pass through at a time. On the floor, at the mid-point ofthe tunnel will be a container of sweetened milk. This basic apparatus will be replicated, so that a total of four pairs of rats can be video tracked simultaneously. The camera can guish rats marked by different colors. Thus, the rats’ heads will be colored for the purpose of video tracking, red in one cage and yellow in the other cage.

Only one animal at a time can have comfortable access to the feeder, but both animals can drink milk during the five-minute daily session. During the five-minute daily sessions, time spent in the feeder zone by each rat will be recorded by the video tracking software and saved into a text file.

The test will begin with a random assignment of rats into pairs. Each member of a pair will be placed in an opposite chamber of the testing apparatus. The time spent in the feeder zone by each animal will be recorded. During the first week (five days) of g the animals habituate to the new nment. Dominance will be assigned to the animal with the highest score during the second week of testing if three criteria are achieved. First, there must be a significant difference (two-tailed t-test, P<0.05) between the average daily drinking scores of both animals. Second, the dominant animal score must be at least 25% greater than the submissive animal's score. Finally, there must be no "reversals" during the pair selection week where the ve submissive rat out-scored its dominant r on isolated occasions. Ideally there will be minimal reversals during the acclimation week as well. Only animal pairs that achieve these criteria will be continued in the study.

Significant differences between time spent on the feeder by dominant and submissive rats will be determined by ANOVA using GraphPad Prism software Pad Software, Inc. San Diego, CA) followed by a two-tailed t-test (P<0.05). Comparisons will be made between treatment groups using normalized dominance level values in paired animals. The dominance level is a value that measures social on between paired subjects. Dominance level (DL) = FTD—FTS where FTD is the feeder time of dominant rats and FTS is the feeder time of submissive rats. The normalization will be conducted according to the formula: Dominance Level (week 11 in %) = ance Level (week n)) / (Dominance Level (week 2) The statistical significance of the difference in dominance level n the control group (pairs of rats where both dominant and submissive animals will be treated with vehicle) and the treatment group (submissive rats will be treated with drug and dominant rats with vehicle) will be determined by ANOVA, followed by a t-test. The ty onset time value at 50% of response (AOT-50) and the m and maximum response to drug will be calculated based on the reduction of the dominance level value using non-linear sion analysis (GraphPad Software, Inc., San Diego, CA). The normalized DL values will be used for this calculation, where DL values for treatment weeks will be normalized as a percent of the second week (pretreatment) value of that pair according the above formula. In these settings the minimum of the response (DL) determines drug positive activity, corresponding to efficacy, since DL values will be reduced if the se to a drug is positive. In the case of the negative response to a drug (worsening of symptoms) DL values will be increased. If the drug does not have such activity the maximum of the response will not exceed 100%. Any maximal DL value significantly higher than control value (about 100%) indicates drug negative activity.

Levetiracetam and mGluR2 PAM/agonist compound (e. g. nds 2, 2-a, 25-3, 6-b or LY—404039) will be evaluated in the rat RDBM according to the procedure described in more detail below.

Groups of dominant rats will be treated p.o. QD with racetam 10 mg/kg and mGluR2 PAM/agonist compound at various concentrations from approximately 0.05 mg/kg (n23), at 0.5 mg/kg (n23), at 2.5 mg/kg (n23), at 5.0 mg/kg (n23) and at 50.0 mg/kg (n23) . A vehicle l group of dominant rats will be treated with 0.5% methylcellulose (n23) and a second l group of dominant rats will be treated i.p.

QD with sodium valproate at 30 mg/kg (n26 from 2 studies ofn23 each).

All treatments will be administered approximately 1 hour prior to testing. All treatments will be started on Saturday after the second testing week (selection week).

The levetiracetam and mGluR2 onist compound will be administered orally (p.o.).

When dominant animals are treated with levetiracetam lOmg/kg and mGluR2 PAM/agonist compound the difference between dominant and submissive rats will be lost after the first or second week of ent depending on the dosage. Similarly, when dominant animals are treated with sodium valproate, the difference between dominant and submissive rats will also be lost after first week of treatment. The permissiveness of the dominant rats treated with levetiracetam and mGluR2 PAM/agonist compound or sodium ate may be observed to increase. Thus the treated dominant rats will permit their submissive partners to increase their time on the feeder.

To compare different drug and dose effects the data will be normalized to the initial control week values. The strongest effect of levetiracetam and mGluR2 onist compound combination will be observed where there is a significant difference in dominance level (DL) values between vehicle and combination treated rats starting in the second week and continuing through the ent duration of 5 weeks. In comparison, animals (30 mg/kg) that will be treated with sodium ate will tently show a decreased nce level after the second week of treatment with the effect increasing in the following weeks.

To estimate activity onset time (AOT), daily average values for feeder time of nt and submissive animal pairs will be plotted and significant differences between these two groups will be calculated using the two-tail t-test.

To compare activity onset time (AOT) between different treatments the activity onset time will be estimated from the non-linear regression fit. The non-linear regression model will fit for each drug, combination and dose normalized daily DL values.

Effects of levetiracetam and mGluR2 PAM/agonist compound in the RDBM are expected to be dose dependent.

In this assay, the combination of racetam and mGlu2 PAM/agonist compounds is expected to reduce dominant or indicating that the combination is active as an antimanic.

B) ORAL TABLETS As a specific e of an oral composition, 100 mg of a mGluR2 PAM/agonist nd is formulated with iently finely divided lactose to provide a total amount of 580 to 590 mg to fill a size O hard gel capsule.

While the foregoing specification teaches the principles of the present invention, with examples provided for the purpose of illustration, it will be understood that the practice of the invention encompasses all of the usual variations, adaptations and/or modifications as come within the scope of the following claims and their equivalents.

Claims (26)

1. A combination comprising (a) a synaptic vesicle protein 2A (“SV2A”) ligand selected from the group consisting of levetiracetam, brivaracetam and seletracetam; and 5 (b) a positive allosteric modulator (“PAM”) of metabotropic glutamatergic receptor e 2 (“mGluR2”) compound having the formula , or a pharmaceutically able salt or a solvate thereof.

2. The combination of claim 1, wherein the ve allosteric modulator of metabotropic glutamatergic receptor subtype 2 is 10 , or a hydrochloride salt thereof.

3. The combination according to claim 1 or 2, wherein the SV2A ligand is levetiracetam.

4. The combination according to claim 1 or 2, wherein the SV2A ligand is brivaracetam. 15

5. A pharmaceutical composition comprising a ation as d in any one of claims 1 to 4, and a pharmaceutically acceptable carrier.

6. The pharmaceutical composition according to claim 5, ated as a combined pharmaceutical composition.

7. The pharmaceutical composition according to claim 5, formulated in te 20 pharmaceutical compositions.

8. A process for the preparation of the pharmaceutical composition according to claim 5, wherein the combination as claimed in any one of claims 1 to 4 is intimately admixed with a pharmaceutical carrier.

9. A product sing the combination as defined in any one of claims 1 to 4, as a combined preparation adapted for simultaneous, separate or sequential administration in the treatment or prevention of epilepsy and related disorders; neuropathic pain; migraine or resistant headache; bipolar and related disorders. 5

10. Use of a combination as claimed in any one of claims 1 to 4, or a ceutical composition as defined in any one of claims 5 to 7, in the manufacture of a medicament for neuroprotection or the ent or prevention of epilepsy and related disorders; neuropathic pain; migraine or resistant headache; and bipolar and related disorders.

11. Use of a positive allosteric tor (“PAM”) of metabotropic glutamatergic 10 receptor subtype 2 compound having the a , or a pharmaceutically acceptable salt or a solvate thereof and at least an SV2A ligand selected from the group ting of levetiracetam, brivaracetam and acetam, in the cture of medicaments for neuroprotection or the treatment of epilepsy or related disorders; neuropathic pain; migraine or resistant headache; or bipolar and 15 related disorders, wherein the medicaments are to be administered simultaneously or sequentially in ation therapy.

12. The use according to claim 11, wherein the positive allosteric tor (“PAM”) of metabotropic glutamatergic receptor subtype 2 compound has the a 20

13. The use according to claim 11 or 12, wherein the SV2A ligand is sele cted from the group consisting of levetiracetam and brivaracetam.

14. The use according to any one of claims 10 to 13, for the treatment or prevention of epilepsy and related disorders.

15. The use according to claim 14, for the treatment or prevention of epilepsy. 25

16. The use according to claim 15, n the epilepsy is treatment resistant epilepsy.

17. The use according to claim 15, wherein the epilepsy is with focal onset seizures.

18. The use according to claim 17, wherein the epilepsy is with focal onset seizures with lization.

19. The use according to claim 17, wherein the epilepsy is with focal onset seizures without lization. 5

20. The use according to claim 15, wherein epilepsy is epilepsy with generalized es.

21. The use ing to claim 15, wherein epilepsy is epilepsy with primary generalized tonic-clonic seizures.

22. The use according to claim 10 or claim 11, for neuroprotection.

23. The use ing to claim 11, for the treatment of bipolar disorde r. 10

24.Use of a combination as claimed in any one of claims 1 to 4, or a pharmaceutical composition as defined in any one of claims 5 to 7, in the manufacture of a medicament for the prevention of epileptogenesis.

25. A ceutical product or a commercial package comprising a combination according to any one of claims 1 to 4, or a pharmaceutical composition as defined in any one 15 of claims 5 to 7, together with instructions, adapted for simultaneous, separate or sequential stration thereof in the ent or prevention of epilepsy and related disorders; neuropathic pain; migraine or resistant headache bipolar; and related disorders.

26. The combination according to claim 1, substantially as herein described with reference to any one of the Examples and/or