Patent Publication Number: US-2023149393-A1

Title: Inhibitors of trpc6 for treating respiratory conditions

Description:
FIELD OF THE INVENTION 
     The present invention relates to methods for the treatment of disorders associated with vascular hyperpermeability and conditions arising therefrom, using compounds that inhibit the Transient Receptor Potential C6 ion channel (TRPC6). 
     BACKGROUND 
     A variety of ion channel proteins exist to mediate ion flux across cellular membranes. The proper expression and function of ion channel proteins is essential for the maintenance of cellular function, intracellular communication, and the like. An important aspect of achieving cellular homeostasis is the maintenance of appropriate ion concentrations in various cell types during development and in response to numerous stimuli. Large numbers of diverse types of ion channels act to maintain cellular homeostasis by moving ions into and out of cells across the plasma membrane, and within cells by moving ions across membranes of intracellular organelles including, for example, the endoplasmic reticulum, sarcoplasmic reticulum, mitochondria and endocytic organelles including endosomes and lysosomes. Numerous diseases are the result of dysregulation of membrane potential or aberrant calcium handling. Given the central importance of ion channels in modulating membrane potential and ion flux in cells, identification of agents that can promote or inhibit particular ion channels is of great interest as research tools and as possible therapeutic agents. 
     One such channel is the Transient Receptor Potential C6 (TRPC6) channel. TRPC6 belongs to the larger family of TRP ion channels (see, Desai et al., 2005 Eur J Physiol 451:11-18; Clapham et al., 2001 Nat Neurosci 2:387-396; Clapham, 2003 Nature 426: 517-524; Clapham et al., Pharmacol Rev 55:591-596, 2003). TRPC6 is a calcium permeable channel, specifically a non-selective calcium permeable cation channel. In addition to calcium ions, TRPC6 channels are permeable to other cations, for example sodium. Thus, TRPC6 channels modulate not only intracellular calcium concentration, but also membrane potential by modulating the flux of cations including calcium and sodium ions. Although non-selective cation channels such as TRPC6 modulate, among other things, calcium ion flux, they are mechanistically distinct from voltage-gated calcium channels. Generally, voltage-gated calcium channels respond to depolarization of the potential difference across the membrane and can open to permit an influx of calcium from the extracellular medium and a rapid increase in intracellular calcium levels or concentrations. In contrast, non-selective cation channels such as TRPC6 are generally signal transduction gated, long-lasting, and produce less rapid changes in ion concentration. They show increased activity in response to the production of the second messenger, diacylglycerol (Hofmann et al., 1999). In addition, TRPC6 can respond to changes in pressure. These mechanistic differences are accompanied by structural differences among voltage-gated and cation permeable channels. Thus, although many diverse channels act to regulate ion flux and membrane potential in various cell types and in response to numerous stimuli, it is important to recognize the significant structural, functional, and mechanistic differences among different classes of ion channels. 
     Based on its expression and work implicating it in Transforming Growth Factor-Beta TGF-ß signaling (involved in cell growth, differentiation and apoptosis), TRPC6 is also thought to be important in treating or preventing diseases or disorders of the respiratory system. 
     Yue et al. studied TRPC6 channels for a role in mediating the pulmonary artery smooth muscle cell proliferation that can lead to idiopathic pulmonary arterial hypertension (IPAH) and pulmonary hypertension (PH). Pulmonary vascular medial hypertrophy caused by excessive pulmonary artery smooth muscle cell (PASMC) proliferation is a major cause for the elevated pulmonary vascular resistance in patients with IPAH and PH. The authors found that TRPC6 was highly expressed and TRPC3 was minimally expressed in PASMC from healthy lung tissue. However, in lung tissue from IPAH patients, mRNA and protein expression of TRPC3 and TRPC6 were significantly elevated in comparison to that in normotensive patients. Furthermore, proliferation of PASMC cells derived from IPAH patients was markedly reduced following incubation with TRPC6 siRNA. Based on these results, the authors concluded that TRPC6 may be important in mediating proper PASMC proliferation, and that dysregulation of TRPC6 may lead to increased PASMC proliferation and pulmonary vascular medial hypertrophy observed in IPAH patients (Yu et al., 2004 Proc Natl Acad Sci 101(38):13861-6). Further support is provided by the observation that in IPAH patients the frequency of a single-nucleotide polymorphism in the promoter of TRPC6 which increases expression was significantly higher when compared to normal subjects (Yue, et al., 2009 Circulation 119: 2313-22). 
     Additional evidence implicating TRPC6 dysregulation in IPAH comes from studies of bosentan, a dual endothelin receptor blocker that has been used clinically to treat IPAH. This inhibitor decreases proliferation of PASMCs, but the mechanism by which this occurs is unclear. Interestingly, bosentan both decreases proliferation of PASMC and also decreases expression of TRPC6 in lung tissue of IPAH patients (Kunichika et al., 2004 Am J Respir Crit Care Med 170(10):1101-7). 
     Evidence supports a role of TRPC6 in additional pulmonary disorders. In alveolar macrophages from patients with chronic obstructive pulmonary disease (COPD), TRPC6 expression was found to be elevated when compared with controls (Finney-Hayward et al., 2010 Am J Respir Cell Mol Biol 43:296-304). In human cystic fibrosis epithelial cells, the TRPC6-mediated calcium influx is abnormally increased and may contribute to the hypersecretion of mucus. siRNA-TRPC6 was able to reduce this abnormal calcium influx (Antigny et al. 2011 Am J Resp Cell Mol Biol, 44:83-90). In mouse lung fibroblasts, the pro-fibrotic activity of PDGF is dependent on the activation of TRPC6, suggesting that TRPC6 inhibition would reduce lung fibrosis (Lei et al., 2014 Biomaterials 35:2868-77). A role of TRPC6 in pulmonary endothelial cell function was demonstrated in mouse lung models of ischemia-reperfusion induced-edema and lipopolysaccharide-induced inflammation in which TRPC6 deficiency was able to reduce acute lung injury by preserving endothelial barrier function (Weissmann et al., 2011 Nat Comm, 3:649-58 and Tauseef et al., 2012 J Exp Med 209:1953-68). 
     The inhibition of TRPC6 is an attractive means for preventing other respiratory disorders including lung vascular hyperpermeability, pulmonary (lung) edema, acute respiratory distress syndrome (ARDS), acute lung injury (ALI), lung ischemia reperfusion, idiopathic interstitial pneumonia, Idiopathic pulmonary fibrosis (IPF) and acute exacerbation IPF, severe acute respiratory syndrome (SARS), and Middle Eastern respiratory syndrome (MERS). 
     Increased vascular permeability (vascular hyperpermeability) contributes to many diseases, including acute respiratory distress syndrome, sepsis, severe sepsis, septic shock, cancer and inflammation. Reducing vascular hyperpermeability of the lung will reduce the accumulation of fluid in the alveolar space (lung edema) and therefore will improve the gas exchange between the lung and the vessels leading to a better oxygenation of the arterial blood. Improvement of the arterial blood oxygenation translates into a better oxygenation of all the organs (brain, heart, liver, kidney . . . etc.) and reduces the risk of multiple organ failure followed by death. 
     Increase in vascular permeability in sepsis, severe sepsis, septic shock or ischemia reperfusion is also reported in several organs including but not limited to the lung, kidney, liver and heart. The accumulation of fluid in these organs impairs their proper functioning (e.g. causing arrhythmia, glomerular filtration disruption, or impairment of the metabolism) and leads to organ failure followed by death. 
     Pulmonary (lung) edema is a condition in which the lungs fill with fluid. The most common cause of pulmonary edema is congestive heart failure. Other less common conditions that may cause pulmonary edema include sudden high blood pressure, pneumonia, kidney failure, lung damage caused by severe infection, severe sepsis of the blood, or blood poisoning caused by infection. 
     Acute lung injury (ALI) is a lung disorder often caused by smoke inhalation including, more recently, in the use of E-cigarette or vaping products. Chronic exposure of cigarette smoke (CS) to rats resulted in an increase in TRPC6 mRNA and protein expression in distal pulmonary arteries and similar effects were observed using PASMCs in vitro. Nicotine treatment of cultured rat PASMCs upregulated TRPC6 expression and increased intracellular calcium levels, both of which were reduced by TRPC6 siRNA silencing (Wang et al., 2014 Am J Physiol Cell Physiol 306:C364-73). These results suggest a role for TRPC6 in CS-induced lung injury. Regulation of the TRPC6 pathway may be useful in treating ALI. The separation of ALI from ARDS is of more historical interest, with ALI now considered as a milder or earlier form of ARDS (JAMA. 2012; 307(23):2526-2533). 
     Acute respiratory distress syndrome (ARDS) is a lung inflammation characterized by an increase in lung vascular permeability and/or lung edema. ARDS is often characterized as low, mild, or severe based on the degree of hypoxemia. ARDS can be triggered by several causes, e.g. can be induced by a bacterial or viral lung infection, by sepsis, inhalation of harmful substances, severe pneumonia, trauma, pancreatitis (inflammation of the pancreas), massive blood transfusions and burns. The most common cause of ARDS is sepsis. 
     Severe acute respiratory syndrome (SARS) is a viral respiratory illness caused by a coronavirus called SARS-associated coronavirus (SARS-CoV). SARS begins with a high fever (temperature greater than 100.4° F. [&gt;38.0° C.]). Other symptoms may include sore throat, cough, headache, an overall feeling of discomfort, and body aches. Some people also have mild respiratory symptoms at the outset. Most patients develop pneumonia. Since 2004 until the outbrake of SARS-CoV-2 pandemic in December 2019, there have not been any known cases of SARS reported anywhere in the world. 
     Middle Eastern respiratory syndrome (MERS) is an illness caused by a virus (more specifically, a coronavirus) called Middle East Respiratory Syndrome Coronavirus (MERS-CoV). The disease is characterized by severe respiratory illness, including fever, cough, and shortness of breath. About 3 or 4 out of every 10 patients reported with MERS have died. ARDS can occur as a result of other respiratory viruses, not just coronaviruses, for example, but not limited to Herpes viruses, influenza viruses, respiratory syncytial virus, and parainfluenza viruses. 
     Calcium overload has been recognized as a critical cause of the injury tissues suffer after periods of ischemia. The ports that determine calcium entry into tissues subjected to transient hypoxia have not been identified. TRPC6 is one of the major factors causing calcium entry in the heart and in the lungs, which is responsible for ischemia/reperfusion (I/R) injury. Blocking TRPC6 activity or the genetic ablation of TRPCs markedly protected cardiac and lung tissue and cells from I/R injury (He et al., PNAS. 2017; 19: E4582-E4591, Weismann et al., Nature Communications. 2012; 3(649): DOI:10.1038) 
     Sepsis, severe sepsis, and septic shock are disorders arising from the systemic inflammatory response to an infection (see Mitchell M. Levy et al., Crit Care Med. 2003 April; 31(4):1250-6). Sepsis is a disorder having both an infection (e.g., viral, bacterial, abdominal trauma, gut perforation) and a systemic inflammatory response. This leads to increase in vascular permeability of several organs such as kidney liver, heart and lung. Severe sepsis (sepsis with organ dysfunction) refers to sepsis with acute organ dysfunction caused by sepsis. Septic shock refers to persistent hypotension unexplained by other causes. 
     TRPC6 inhibitors may be useful to reduce progression to, severity and/or the rate of mortality in SARS, MERS, and ARDS. TRPC6 inhibitors may be useful to reduce severity and/or the rate of mortality in sepsis, severe sepsis and septic shock since the survival rate in the mouse model of systemic sepsis (cecal ligation puncture, CLP) was significantly improved (80% vs 10% in the vehicle group) in TRPC6 deficient mice (Tauseef et al., 2012 J Exp Med 209: 1953-1968). 
     In patients hospitalized for Covid-19, there is an increase in reactive oxygen species (ROS) due to airway injury. ROS has been shown to activate TRPC6, causing a cascade of cellular damage resulting in disruption of cell barrier function, hyper-permeability, plasma leakage and eventually oedema and acute respiratory distress syndrome (ARDS). (See Z. S. Miripour et al., Biosensors and Bioelectronics 165 (2020) 112435.) TRPC6 inhibition has been shown to stabilize the pulmonary vasculature to ROS-induced hyper-permeability and may prevent lung oedema in patients with severe SARS-CoV2 infection. 
     There is a need for highly selective TRPC6 antagonists for treating respiratory diseases or disorders that can be alleviated by modulating TRPC6. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention provides methods for treating disorders associated with vascular hyperpermeability and/or conditions arising therefrom by inhibiting the Transient Receptor Potential C6 ion channel (TRPC6). 
     Disorders associated with vascular hyperpermeability encompass 
     (group 1): respiratory disorders associated with vascular hyperpermeability that are not primarily caused by an infection, and 
     (group 2): disorders associated with vascular hyperpermeability caused by certain bacterial, viral, or fungal parasites infections. 
     Disorders of group 1 are selected from the group consisting of 
     pulmonary (lung) edema), 
     idiopathic interstitial pneumonia, 
     idiopathic pulmonary fibrosis (IPF) and acute exacerbation IPF, 
     ARDS, not infection-related, 
     acute lung injury (ALI), and 
     lung ischemia reperfusion. 
     Disorders of group 2 are selected from the group consisting of 
     ARDS, related to infection, 
     severe acute respiratory syndrome (SARS), 
     middle eastern respiratory syndrome (MERS), 
     sepsis, 
     severe sepsis, and 
     septic shock. 
     ARDS, not infection-related, is understood as ARDS which is not triggered or caused by an infection, such as ARDS caused by inhalation of harmful substances (e.g. toxic smoke), trauma, pancreatitis, gastric juice reflux, massive blood transfusions or burns. 
     ARDS, infection-related, is understood as ARDS which is triggered or caused by an infection, such as ARDS caused by sepsis or severe pneumonia. 
     In one embodiment, the invention relates to a method for treating a disorder associated with vascular hyperpermeability and/or conditions arising therefrom, comprising administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I), 
     
       
         
         
             
             
         
       
     
     wherein 
     L is absent or is methylene or ethylene; 
     Y is CH or N; 
     A is CH or N; 
     R 1  is selected from the group consisting of:
         C 1-6 alkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo, C 3-6 cycloalkyl and OC 3-6 cycloalkyl;   phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, C 3-6 cycloalkyl, OC 3-6 cycloalkyl, and OC 1-6 alkyl optionally substituted with one to three halo; and   C 3-6 cycloalkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo and C 1-6 alkyl optionally substituted with 1 to 3 halo;       

     R 2  is selected from the group consisting of H, C 1-6 alkyl, OCF 3 , C 3-6 cycloalkyl, OC 1-6 alkyl, and OC 3-6 cycloalkyl; 
     R 3  is selected from the group consisting of H, C 1-6 alkyl, C 3-6 cycloalkyl, and OC 3-6 cycloalkyl; wherein each of the C 1-6 alkyl, C 3-6 cycloalkyl, OC 3-6 cycloalkyl of the R 3  group may be optionally substituted with one to three groups each independently selected from the group consisting of halo, OH, OC 1-6 alkyl, and SC 1-6 alkyl, N(C 1-6 alky) 2 ; and wherein one to three carbon atoms of the C 1-6 alkyl of the R 3  group may optionally be replaced one or two moieties selected from the group consisting of NH, N(C 1-6 alkyl), O, and S; 
     R 4  and R 5  are each independently selected from the group consisting of H and C 1-6 alkyl; 
     R 3  and R 4  can together with the atom to which they are attached join to form a 3 to 9-membered carbocyclyl ring which optionally may contain one to three heteroatoms selected from the group consisting of N, O, and S; or 
     R 3  and R 5  can together form a 3 to 9-membered bicyclic ring which optionally may contain one to three heteroatoms selected from the group consisting of N, O, and S; 
     R 6  is selected from the group consisting of H, C 1-6 alkyl, CN, CF 3 , OCF 3 , C 3-6 cycloalkyl, OC 1-6 alkyl, and OC 3-6 cycloalkyl; 
     R 7  is selected from the group consisting of H and OC 1-6 alkyl; 
     or a pharmaceutically acceptable salt thereof. 
     In a second embodiment, the invention relates to the method of the first embodiment, wherein the disorder associated with vascular hyperpermeability and/or conditions arising therefrom is selected from the group 1 consisting of: 
     pulmonary (lung) edema, 
     idiopathic interstitial pneumonia, 
     idiopathic pulmonary fibrosis (IPF) and acute exacerbation IPF, 
     (ARDS), not infection-related, 
     acute lung injury (ALI), and 
     lung ischemia reperfusion. 
     In a third embodiment, the invention relates to the method of the first embodiment, wherein the disorder associated with vascular hyperpermeability and/or conditions arising therefrom is selected from the group 2 consisting of: 
     ARDS, related to infection, 
     severe acute respiratory syndrome (SARS), 
     middle eastern respiratory syndrome (MERS), 
     sepsis, 
     severe sepsis, and 
     septic shock. 
     In another embodiment (embodiment four), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 1  is selected from the group consisting of:
         C 1-6 alkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo, and C 3-6 cycloalkyl;   phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, OC 3-6 cycloalkyl, and OC 1-6 alkyl optionally substituted with one to three halo; and   C 3-6 cycloalkyl optionally substituted with 1 to 3 halo groups;       

     R 2  is OC 1-6 alkyl; 
     R 3  is selected from the group consisting of H and C 1-6 alkyl optionally substituted with OH or OC 1-6 alkyl, 
     R 4  is H; 
     R 5  is H; 
     R 3  and R 4  can together with the atom to which they are attached join to form a 3 to 9-membered carbocyclyl ring which optionally may contain one to three heteroatoms selected from the group consisting of N and O; or 
     R 3  and R 5  can together form a 3 to 9-membered bicyclic which optionally may contain one to three heteroatoms selected from the group consisting of N and O; 
     R 6  is selected from the group consisting of H, C 1-6 alkyl, OC 1-6 alkyl, and OC 3-6 cycloalkyl, 
     R 7  is selected from the group consisting of H and OC 1-6 alkyl; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment five), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     A is CH and Y is N; or 
     A is CH and Y is CH; or 
     A is N and Y is CH; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment six), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 1  is selected from the group consisting phenyl optionally substituted with a group selected from the group consisting of CF 3 , OCF 3 , halo, OC 3-6 cycloalkyl, and OC 1-6 alkyl optionally substituted with one to three halo; and, 
     R 2  is OC 1-6 alkyl; 
     R 3  is selected from the group consisting of H and C 1-6 alkyl optionally substituted with OH or OC 1-6 alkyl; 
     R 4  is H; 
     R 5  is H; 
     R 3  and R 4  can together with the atom to which they are attached join to form a 3 to 9-membered carbocyclyl ring which optionally may contain one to three heteroatoms selected from the group consisting of N and O; or 
     R 3  and R 5  can together form a 3 to 9-membered bicyclic which optionally may contain one to three heteroatoms selected from the group consisting of N and O; 
     R 6  is selected from the group consisting of H, C 1-6 alkyl, OC 1-6 alkyl, and OC 3-6 cycloalkyl; 
     R 7  is selected from the group consisting of H and OC 1-6 alkyl; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment seven), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 1  is selected from the group consisting phenyl optionally substituted with a group selected from the group consisting of CF 3 , OCF 3 , F, and methoxy; 
     R 2  is selected from the group consisting of methoxy and ethoxy; 
     R 3  is selected from the group consisting of H, 2-hydroxymethyl, methoxymethyl, and 1-hydroxyethyl; 
     R 4  is H; 
     R 5  is H; 
     or 
     R 3  is ethyl, and R 3  and R 4  join to form a spirocyclic ring; 
     or 
     R 3  is ethyl or methoxymethyl, and R 3  and R 5  join to form a bicyclic ring; 
     R 6  is selected from the group consisting of H, methyl, methoxy, ethoxy, propoxy, and cyclylpropyloxy; 
     R 7  is selected from the group consisting of H and methoxy; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment eight), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 1  together with L represent a group selected from the group consisting of phenyl, 4-chlorophenyl, 4-fluorophenyl, 4-methoxyphenyl, 4-isopropoxyphenyl, 4-trifluoromethylphenyl, 4-difluoromethoxyphenyl 4-cyclopropyloxyphenyl, cyclopropyl, cyclopentyl, cyclohexyl, benzyl, 2-fluorobenzyl, and phenylethyl; 
     R 2  is methoxy or ethoxy; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment nine), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     Y is CH and A is N; 
     R 1  together with L represent a group selected from the group consisting of phenyl, 4-chlorophenyl, 4-fluorophenyl, 4-methoxyphenyl, 4-isopropoxyphenyl, 4-trifluoromethylphenyl, 4-difluoromethoxyphenyl 4-cyclopropyloxyphenyl, benzyl, 2-fluorobenzyl, and phenylethyl; 
     R 2  is methoxy or ethoxy; 
     R 3 , R 4  and R 5  are each H; 
     R 6  is H, methyl, methoxy or ethoxy; 
     R 7  is H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment ten), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     Y is CH and A is CH; 
     R 1  together with L represent a group selected from the group consisting of phenyl, 4-chlorophenyl, 4-fluorophenyl, 4-methoxyphenyl, 4-trifluoromethylphenyl, cyclopentyl, cyclohexyl, benzyl, 2-fluorobenzyl, and phenylethyl; 
     R 2  is methoxy or ethoxy; 
     R 3 , R 4  and R 5  are each H; 
     R 6  is H, methyl, methoxy, or ethoxy; 
     R 7  is H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment eleven), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     Y is N and A is CH; 
     R 1  together with L represent a group selected from the group consisting of phenyl, and 4-fluorophenyl; 
     R 2  is methoxy; 
     R 3  is selected from the group consisting of H, 2-hydroxymethyl, and hydroxyethyl, 
     R 4  is H; 
     R 5  is H; 
     R 3  and R 4  may join to form a spirocyclic ring; 
     or 
     R 3  and R 5  may join to form a bicyclic ring; 
     R 6  is selected from the group consisting of H and methoxy; 
     R 7  is H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment twelve), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 1  is C 1-6 alkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo and C 3-6 cycloalkyl; 
     R 2  is OC 1-6 alkyl; 
     R 3 , R 4  and R 5  are each H; 
     R 6  is selected from the group consisting of H, C 1-6 alkyl, and OC 1-6 alkyl; 
     R 7  is H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment thirteen), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein R 1  together with L represent a group selected from the group consisting ethyl, propyl, isopropyl, isobutyl, cyclopropylmethyl, cyclobutylmethyl, 2,2-dimethylpropyl, 1-methylcyclopropylmethyl, 1-fluoromethylcyclopropylmethyl, 1-cyclopropylethyl, 2-cyclopropylethyl, cyclopentyl, cyclohexyl, 2,2-difluorocyclobutylmethyl, 3,3-difluorocyclobutylmethyl, 3-(trifluoromethyl)cyclobutylmethyl, and 3,3,3-trifluoro-2-methyl-propyl; 
     R 2  is methoxy; 
     R 3 , R 4  and R 5  are each H; 
     R 6  is selected from the group consisting of H, methyl, and methoxy; 
     R 7  is H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment fourteen), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     Y is CH and A is N; 
     R 1  together with L represent a group selected from the group consisting propyl, isopropyl, isobutyl, cyclopropylmethyl, cyclobutylmethyl, 2,2-dimethylpropyl, 1-cyclopropylethyl, 2-cyclopropylethyl, and cyclohexyl; 
     R 2  is methoxy; 
     R 3 , R 4  and R 5  are each H; 
     R 6  is selected from the group consisting of H, methyl, and methoxy; 
     R 7  is H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment fifteen), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     Y is CH and A is CH; 
     R 1  together with L represent a group selected from the group consisting ethyl, propyl, isopropyl, isobutyl, cyclopropylmethyl, cyclobutylmethyl, 2,2-dimethylpropyl, 1-methylcyclopropylmethyl, 1-fluoromethylcyclopropylmethyl, 1-cyclopropylethyl, 2-cyclopropylethyl, cyclopentyl, cyclohexyl, 2,2-difluorocyclobutylmethyl, 3,3-difluorocyclobutylmethyl, 3-(trifluoromethyl)cyclobutylmethyl, and 3,3,3-trifluoro-2-methyl-propyl; 
     R 2  is methoxy; 
     R 3 , R 4  and R 5  are each H; 
     R 6  is selected from the group consisting of H, methyl, and methoxy; 
     R 7  is H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment sixteen), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 3  and R 4  together with the atom to which they are attached join to form a 3-membered carbocyclyl ring; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment seventeen), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 3  and R 5  together form a 3 to 9-membered bicyclic ring which optionally may contain one to two heteroatoms independently selected from the group consisting of N and O, and 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment eighteen), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     Y is C; 
     A is N; 
     R 2  is OCH 3 ; and 
     R 3 , R 4 , R 5  and R 7  are each H; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment nineteen), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     L is absent; 
     R 1  is phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, C 3-6 cycloalkyl, OC 3-6 cycloalkyl, and OC 1-6 alkyl optionally substituted with one to three halo; and 
     R 6  is H; or OCH 3 ; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment twenty), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 1  is selected from the group consisting of phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, OC 3-6 cycloalkyl, and OC 1-6 alkyl optionally substituted with one to three halo; 
     R 2  is OCH 3  or OCH 2 CH 3 ; 
     R 3 , R 4 , R 5 , R 6 , and R 7  are each H; and 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment twenty-one), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein 
     R 1  is selected from the group consisting of phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, OC 3-6 cycloalkyl, and OC 1-6 alkyl optionally substituted with one to three halo; 
     R 2  is OCH 3  of OCH 2 CH 3 ; 
     R 3 , R 4 , R 5  and R 7  are each H; 
     R 6  is CH 3  or OCH 3 ; 
     Y is CH; and 
     A is N; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment twenty-two), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein L is absent; 
     or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment twenty-three), the invention relates to a method of using the compound of formula (I) according to any one of embodiments one, two or three, wherein the compound is selected from the group consisting of any one of compounds 1-95 in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment (embodiment twenty-four), the invention relates to a method for treating a disorder associated with vascular hyperpermeability and/or conditions arising therefrom comprising administering to a patient in need thereof a pharmaceutical composition comprising a compound of formula (I) or any compound of the invention as defined herein, or a pharmaceutically acceptable salt thereof, and optionally a pharmaceutically acceptable excipient. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIGS.  1 A,  1 B and  1 C  show that compound 17 significantly reduces pulmonary vascular leakage. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Table 1 shows specific compounds that can be used according to the methods described herein. The compounds shown in Table 1 may be prepared according to procedures described in WO2019081637. 
     
       
         
           
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 Cpd No. 
                 Structure 
                 Compound Name 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                 1 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methoxy-pyridin-3-yl)- piperazin-1-yl]-[5-(4-fluoro- phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 2 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methyl-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(4-fluoro-phenoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 3 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-3′,4′,5′,6′-tetrahydro-2′H- [3,4′]bipyridinyl-1′-yl)-(4-methoxy-5- phenoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 4 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(4-fluoro-phenoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 5 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methoxy-pyridin-3-yl)- piperazin-1-yl]-(4-methoxy-5- phenoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 6 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)- piperidin-1-yl]-[5-(4-isopropoxy- phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 7 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-4-methyl-pyridin-3- yl)-2-hydroxymethyl-piperazin-1-yl]- [5-(4-fluoro-phenoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 8 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [7-(6-Amino-4-methoxy-pyridin-3-yl)- 4,7-diaza-spiro[2.5]oct-4-yl]-(4- methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 9 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [7-(6-Amino-4-methoxy-pyridin-3-yl)- 4,7-diaza-spiro[2.5]oct-4-yl]-[5-(4- fluoro-phenoxy)-4-methoxy-pyridin- 2-yl]-methanone 
               
               
                   
               
               
                 10 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methyl-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (4-methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 11 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-5-methoxy-pyridazin-3- yl)-piperidin-1-yl]-[5-(4-fluoro- phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 12 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridin-3-yl)-piperazin- 1-yl]-[4-methoxy-5-(4-methoxy- phenoxy)-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 13 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridin-3-yl)-piperazin- 1-yl]-[5-(4-fluoro-phenoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 14 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-3′,4′,5′,6′-tetrahydro-2′H- [3,4′]bipyridinyl-1′-yl)-[5-(4-fluoro- phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 15 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridin-3-yl)-piperazin- 1-yl]-(4-methoxy-5-phenoxy-pyridin- 2-yl)-methanone 
               
               
                   
               
               
                 16 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)- piperidin-1-yl]-(4-methoxy-5- phenoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 17 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)- piperidin-1-yl]-[5-(4-fluoro-phenoxy)- 4-methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 18 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-4-methyl-pyridin-3- yl)-2-hydroxymethyl-piperazin-1-yl]- (4-methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 19 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(2-fluoro-benzyloxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 20 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-pyridin-3-yl)-2- hydroxymethyl-piperazin-1-yl]-[5-(4- fluoro-phenoxy)-4-methoxy-pyridin- 2-yl]-methanone 
               
               
                   
               
               
                 21 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-5-methoxy-pyridazin-3- yl)-piperidin-1-yl]-(4-methoxy-5- phenoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 22 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-3′,4′,5′,6′-tetrahydro-2′H- [3,4′]bipyridinyl-1′-yl)-[4-methoxy-5- (4-methoxy-phenoxy)-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 23 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (4-methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 24 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [4-methoxy-5-(4-trifluoromethyl- phenoxy)-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 25 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)- piperidin-1-yl]-(5-cyclobutylmethoxy- 4-methoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 26 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [4-methoxy-5-(1-methyl- cyclopropylmethoxy)-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 27 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-4-methoxy-pyridin- 3-yl)-2-methoxymethyl-piperazin-1- yl]-(4-methoxy-5-phenoxy-pyridin-2- yl)-methanone 
               
               
                   
               
               
                 28 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [4-methoxy-5-(4-methoxy-phenoxy)- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 29 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methyl-pyridazin-3- yl)-piperidin-1-yl]-[5-(4-fluoro- phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 30 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-cyclohexyloxy-4-methoxy-pyridin- 2-yl)-methanone 
               
               
                   
               
               
                 31 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methyl-pyridazin-3- yl)-piperidin-1-yl]-(4-methoxy-5- phenoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 32 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(4-fluoro-benzyloxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 33 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)- piperidin-1-yl]-[4-methoxy-5-(4- trifluoromethyl-phenoxy)-pyridin-2- yl]-methanone 
               
               
                   
               
               
                 34 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)- piperidin-1-yl]-[5-(4-chloro-phenoxy)- 4-methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 35 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-cyclopentyloxy-4-methoxy- pyridin-2-yl)-methanone 
               
               
                   
               
               
                 36 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)- piperidin-1-yl]-(5-isobutoxy-4- methoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 37 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-cyclopropylmethoxy-4-methoxy- pyridin-2-yl)-methanone 
               
               
                   
               
               
                 38 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [3-(6-Amino-4-methoxy-pyridin-3-yl)- 3,8-diaza-bicyclo[3.2.1]oct-8-yl]-[5-(4- fluoro-phenoxy)-4-methoxy-pyridin-2- yl]-methanone 
               
               
                   
               
               
                 39 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-isobutoxy-4-methoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 40 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(4-cyclopropoxy-phenoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 41 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(4-fluoro-benzyloxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 42 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-4-methoxy-pyridin-3- yl)-2-hydroxymethyl-piperazin-1-yl]- [5-(4-fluoro-phenoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 43 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-benzyloxy-4-methoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 44 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[4-methoxy-5-(4-methoxy- phenoxy)-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 45 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(3,3-difluoro-cyclobutylmethoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 46 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (4-methoxy-5-propoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 47 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methoxy-pyridazin-3- yl)-piperidin-1-yl]-(4-methoxy-5- phenoxy-pyridin-2-yl)-methanone 
               
               
                   
               
               
                 48 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(2-cyclopropyl-ethoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 49 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methoxy-pyridazin-3- yl)-piperidin-1-yl]-[5-(4-fluoro- phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 50 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (1R)-1-[(2R)-4-(6-amino-4- methoxypyridin-3-yl)-1-(5- phenoxypyridine-2- carbonyl) piperazin-2-yl]ethan-1-ol 
               
               
                   
               
               
                 51 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [3-(6-Amino-4-methoxy-pyridin-3-yl)- 3,8-diaza-bicyclo[3.2.1]oct-8-yl]-(4- methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 52 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (4-methoxy-5-phenethyloxy-pyridin-2- yl)-methanone 
               
               
                   
               
               
                 53 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-cyclobutylmethoxy-4-methoxy- pyridin-2-yl)-methanone 
               
               
                   
               
               
                 54 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(4-difluoromethoxy-phenoxy)- 4-methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 55 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-4-methoxy-pyridin-3- yl)-2-methoxymethyl-piperazin-1-yl]- [5-(4-fluoro-phenoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 56 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methoxy-pyridazin-3- yl)-piperidin-1-yl]-[4-methoxy-5-(4- trifluoromethyl-phenoxy)-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 57 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(2-fluoro-benzyloxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 58 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (7S)-1-[(2R)-4-(6-amino-4- methoxypyridin-3-yl)-1-(5- phenoxypyridine-2- carbonyl) piperazin-2-yl]ethan-1-ol 
               
               
                   
               
               
                 59 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(2,2-dimethyl-propoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 60 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-5-methoxy-pyridazin-3- yl)-piperidin-1-yl]-[4-methoxy-5-(4- methoxy-phenoxy)-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 61 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methoxy-pyridin-3-yl)- piperazin-1-yl]-(5- cyclopropylmethoxy-4-methoxy- pyridin-2-yl)-methanone 
               
               
                   
               
               
                 62 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-(5-cyclohexyloxy-4-methoxy- pyridin-2-yl)-methanone 
               
               
                   
               
               
                 63 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(S)-4-(6-Amino-4-methoxy-pyridin-3- yl)-2-hydroxymethyl-piperazin-1-yl]- [5-(4-fluoro-phenoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 64 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(1-fluoromethyl- cyclopropyl methoxy)-4-methoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 65 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-ethoxy-4-methoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 66 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methoxy-pyridazin-3- yl)-piperidin-1-yl]-[4-methoxy-5-(4- methoxy-phenoxy)-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 67 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(2-cyclopropyl-ethoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 68 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [7-(6-Amino-4-methoxy-pyridin-3-yl)- 3-oxa-9-aza-bicyclo[3.3.1]non-9-yl]- (4-methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 69 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-4-methoxy-pyridin-3- yl)-2-hydroxymethyl-piperazin-1-yl]- (4-methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 70 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-((S)-1-cyclopropyl-ethoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 71 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(S)-4-(6-Amino-4-methoxy-pyridin-3- yl)-2-hydroxymethyl-piperazin-1-yl]- (4-methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 72 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- (5-isopropoxy-4-methoxy-pyridin-2- yl)-methanone 
               
               
                   
               
               
                 73 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-(4-methoxy-5-phenethyloxy- pyridin-2-yl)-methanone 
               
               
                   
               
               
                 74 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(2,2-dimethyl-propoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 75 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[4-methoxy-5-(1-methyl- cyclopropylmethoxy)-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 76 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-(4-methoxy-5-propoxy-pyridin-2- yl)-methanone 
               
               
                   
               
               
                 77 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-methoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-((R)-1-cyclopropyl-ethoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 78 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-methyl-pyridazin-3-yl)- piperidin-1-yl]-(5- cyclopropylmethoxy-4-methoxy- pyridin-2-yl)-methanone 
               
               
                   
               
               
                 79 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-((S)-1-cyclopropyl-ethoxy)-4- methoxy-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 80 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[4-methoxy-5-(4- trifluoromethoxy-phenoxy)-pyridin-2- yl]-methanone 
               
               
                   
               
               
                 81 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-pyridin-3-yl)-2- hydroxymethyl-piperazin-1-yl]-(4- methoxy-5-phenoxy-pyridin-2-yl)- methanone 
               
               
                   
               
               
                 82 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [(R)-4-(6-Amino-pyridin-3-yl)-2- hydroxymethyl-piperazin-1-yl]-[4- methoxy-5-(4-methoxy-phenoxy)- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 83 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(phenoxy)-4-ethoxy-pyridin-2- yl]-methanone 
               
               
                   
               
               
                 84 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-cyclopropoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 85 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-4-ethoxy-pyridazin-3-yl)- piperidin-1-yl]-[4-methoxy-5- (phenoxy)-pyridin-2-yl]-methanone 
               
               
                   
               
               
                 86 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 (6-Amino-4-propoxy-3′,4′,5′,6′- tetrahydro-2′H-[3,4′]bipyridinyl-1′-yl)- [5-(phenoxy)-4-methoxy-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 87 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 5-Ethoxy-6-(1-{4-methoxy-5-[4- (trifluoromethyl)phenoxy]pyridine-2- carbonyl}piperidin-4-yl)pyridazin-3- amine 
               
               
                   
               
               
                 88 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [4-(6-Amino-pyridazin-3-yl)-piperidin- 1-yl]-[5-(4-fluoro-phenoxy)-4-ethoxy- pyridin-2-yl]-methanone 
               
               
                   
               
               
                 89 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 [3-(6-Amino-pyridazin-3-yl)-8-aza- bicyclo[3.2.1]oct-8-yl]-[4-ethoxy-5-(4- fluoro-phenoxy)-pyridin-2-yl]- methanone 
               
               
                   
               
               
                 90 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 6-(1-{4-Methoxy-5-[4-(trifluoro- methyl)phenoxy]pyridine-2- carbonyl}piperidin-4-yl)-5- methylpyridazin-3-amine 
               
               
                   
               
               
                 91 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 5-Methoxy-6-(1-{5-[4-(trifluoro- methyl)-phenoxy]-pyridine-2- carbonyl}piperidin-4-yl)-pyridazin-3- amine 
               
               
                   
               
               
                 92 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 4-Methoxy-5-[1-(4-methoxy-5-{[trans- 3-(trifluoromethyl)cyclobutyl]- methoxy}pyridine-2-carbonyl)- piperidin-4-yl]pyridin-2-amine 
               
               
                   
               
               
                 93 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 4-Methoxy-5-[1-(4-methoxy-5-{[(cis- 3-(trifluoromethyl)-cyclobu- tyl]methoxy}-pyridine-2-carbo- nyl)piperidin-4-yl]pyridin-2-amine 
               
               
                   
               
               
                 94 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 4-Methoxy-5-(1-{4-methoxy-5-[(2)- 3,3,3-trifluoro-2-methylpropoxy]- pyridine-2-carbonyl}piperidin-4- yl)pyridin-2-amine 
               
               
                   
               
               
                 95 
                 
                   
                     
                     
                         
                         
                     
                   
                 
                 5-(1-{5-[(2,2-Difluorocyclobutyl)- methoxy]-4-methoxy-pyridine-2- carbonyl}-piperidin-4-yl)-4- methoxypyridin-2-amine 
               
               
                   
               
            
           
         
       
     
     In another embodiment, the invention relates to a method of using any of the compounds 1 to 95 depicted in Table 1 above, and the pharmaceutically acceptable salts thereof, for treating, or reducing the severity of a disorder associated with vascular hyperpermeability and/or conditions arising therefrom which is selected from the group 1 consisting of
         pulmonary (lung) edema,   idiopathic interstitial pneumonia,   idiopathic pulmonary fibrosis (IPF) and acute exacerbation IPF,   (ARDS), not infection-related,   acute lung injury (ALI), and   lung ischemia reperfusion,       

     or which is selected from the group 2 consisting of
         ARDS, related to infection,   severe acute respiratory syndrome (SARS),   middle eastern respiratory syndrome (MERS),   sepsis,   severe sepsis, and   septic shock.       

     In another embodiment, the invention relates to the embodiments immediately above, wherein any one of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof, is administered to the patient. 
     Any method of treatment embodiments one to twenty-four as well as any method of treatment embodiments referring to one or more of compounds 1 to 95 disclosed hereinbefore is understood to have a corresponding embodiment in the European second medical use format 
     “compound X for use in the treatment of disease Y” or 
     “pharmaceutical composition comprising compound X for use in the therapy of disease Y”, 
     wherein compound X stands for a compound of formula I or one or more of compounds 1 to 95 disclosed hereinbefore, and disease Y stands for a disorder associated with vascular hyperpermeability and/or conditions arising therefrom and the specific conditions of group 1 and 2 disclosed hereinbefore. 
     Exemplary, the broadest embodiments in the European second medical use format read as follows: 
     In a further embodiment the invention relates to a TRPC6 inhibitor of formula (I), as defined hereinbefore, for use in the treatment of a disorder associated with vascular hyperpermeability and/or conditions arising therefrom. 
     In yet a further embodiment the invention relates to a pharmaceutical composition comprising a TRPC6 inhibitor of formula (I), as defined hereinbefore, for use in the treatment of a disorder associated with vascular hyperpermeability and/or conditions arising therefrom. 
     General Definitions 
     Terms not specifically defined herein should be given the meanings that would be given to them by one of skill in the art in light of the disclosure and the context. As used in the specification, however, unless specified to the contrary, the following terms have the meaning indicated and the following conventions are adhered to. 
     In the groups, radicals, or moieties defined below, the number of carbon atoms is often specified preceding the group, for example, C 1-6 -alkyl means an alkyl group or radical having 1 to 6 carbon atoms. In general in groups like HO, H 2 N, (O)S, (O) 2 S, NC (cyano), HOOC, F 3 C or the like, the skilled artisan can see the radical attachment point(s) to the molecule from the free valences of the group itself. For combined groups comprising two or more subgroups, the last named subgroup is the radical attachment point, for example, the substituent “aryl-C 1-3 -alkyl” means an aryl group, which is bound to a C 1-3 -alkyl-group, the latter of which is bound to the core or to the group to which the substituent is attached. 
     In case a compound is depicted in form of a chemical name and as a formula in case of any discrepancy the formula shall prevail. 
     The term “substituted” as used herein, means that any one or more hydrogens on the designated atom is replaced with a selection from the indicated group, provided that the designated atom&#39;s normal valence is not exceeded, and that the substitution results in a stable compound. 
     Unless specifically indicated, throughout the specification and the appended claims, a given chemical formula or name shall encompass tautomers and all stereo, optical and geometrical isomers (e.g. enantiomers, diastereomers, E/Z isomers etc.) and racemates thereof as well as mixtures in different proportions of the separate enantiomers, mixtures of diastereomers, or mixtures of any of the foregoing forms where such isomers and enantiomers exist, as well as salts, including pharmaceutically acceptable salts thereof and solvates thereof such as for instance hydrates including solvates of the free compounds or solvates of a salt of the compound. 
     The phrase “pharmaceutically acceptable” is employed herein to refer to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, and commensurate with a reasonable benefit/risk ratio. 
     As used herein, “pharmaceutically acceptable salt” refers to derivatives of the disclosed compounds wherein the parent compound is modified by making acid or base salts thereof. Examples of pharmaceutically acceptable salts include, but are not limited to, mineral or organic acid salts of basic residues such as amines; alkali or organic salts of acidic residues such as carboxylic acids; and the like. 
     For example, such salts include acetates, ascorbates, benzenesulfonates, benzoates, besylates, bicarbonates, bitartrates, bromides/hydrobromides, edetates, camsylates, carbonates, chlorides/hydrochlorides, citrates, edisylates, ethane disulfonates, estolates esylates, formates, fumarates, gluceptates, gluconates, glutamates, glycolates, glycollylarsnilates, hexylresorcinates, hydrabamines, hydroxymaleates, hydroxynaphthoates, iodides, isothionates, lactates, lactobionates, malates, maleates, mandelates, methanesulfonates, methylbromides, methylnitrates, methylsulfates, mucates, napsylates, nitrates, oxalates, pamoates, pantothenates, phenylacetates, phosphates/diphosphates, polygalacturonates, propionates, salicylates, stearates, subacetates, succinates, sulfamides, sulfates, tannates, tartrates, teoclates, toluenesulfonates, triethiodides, trifluoroacetates, ammonium, benzathines, chloroprocaines, cholines, diethanolamines, ethylenediamines, meglumines and procaines. Further pharmaceutically acceptable salts can be formed with cations from metals like aluminium, calcium, lithium, magnesium, potassium, sodium, zinc and the like (also see Pharmaceutical salts, Birge, S. M. et al., J. Pharm. Sci., (1977), 66, 1-19) or with cations from ammonia, L-arginine, calcium, 2,2′-iminobisethanol, L-lysine, magnesium, N-methyl-D-glucamine, potassium, sodium and tris(hydroxymethyl)-aminomethane. 
     The term halogen generally denotes fluorine, chlorine, bromine and iodine. 
     The term “C 1-n -alkyl”, wherein n is an integer selected from the group consisting of 2, 3, 4, 5 or 6, preferably 4 or 6, either alone or in combination with another radical denotes an acyclic, saturated, branched or linear hydrocarbon radical with 1 to n C atoms. For example the term C 1-5 -alkyl embraces the radicals H 3 C—, H 3 C—CH 2 —, H 3 C—CH 2 —CH 2 —, H 3 C—CH(CH 3 )—, H 3 C—CH 2 —CH 2 —CH 2 —, H 3 C—CH 2 —CH(CH 3 )—, H 3 C—CH(CH 3 )—CH 2 —, H 3 C—C(CH 3 ) 2 —, H 3 C—CH 2 —CH 2 —CH 2 —CH 2 —, H 3 C—CH 2 —CH 2 —CH(CH 3 )—, H 3 C—CH 2 —CH(CH 3 )—CH 2 —, H 3 C—CH(CH 3 )—CH 2 —CH 2 —, H 3 C—CH 2 —C(CH 3 ) 2 —, H 3 C—C(CH 3 ) 2 —CH 2 —, H 3 C—CH(CH 3 )—CH(CH 3 )— and H 3 C—CH 2 —CH(CH 2 CH 3 )—. 
     The term “C 3-n -cycloalkyl”, wherein n is an integer from 4 to n, either alone or in combination with another radical denotes a cyclic, saturated, unbranched hydrocarbon radical with 3 to n C atoms. For example, the term C 3-7 -cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl. 
     By the term “halo” added to an “alkyl”, “alkylene” or “cycloalkyl” group (saturated or unsaturated) is such an alkyl or cycloalkyl group wherein one or more hydrogen atoms are replaced by a halogen atom selected from among fluorine, chlorine or bromine, preferably fluorine and chlorine, particularly preferred is fluorine. Examples include: H 2 FC—, HF 2 C—, F 3 C—. Analogously, the term “halo” added to an aryl group (e.g., phenyl) means that one or more hydrogen atoms are replaced by a halogen atom selected from among fluorine, chlorine or bromine, preferably fluorine and chlorine, particularly preferred is fluorine. 
     The term “carbocyclyl” as used either alone or in combination with another radical, means a mono- bi- or tricyclic ring structure consisting of 3 to 9 carbon atoms and optionally a heteroatom selected from the group consisting of N, O, and S. The term “carbocyclyl” refers to fully saturated ring systems and encompasses fused, bridged and spirocyclic systems. 
     Many of the terms given above may be used repeatedly in the definition of a formula or group and in each case have one of the meanings given above, independently of one another. 
     Unless specifically indicated, throughout the specification and the appended claims, a given chemical formula or name shall encompass tautomers and all stereo, optical and geometrical isomers (e.g. enantiomers, diastereomers, E/Z isomers, etc.) and racemates thereof as well as mixtures in different proportions of the separate enantiomers, mixtures of diastereomers, or mixtures of any of the foregoing forms where such isomers and enantiomers exist, as well as salts, including pharmaceutically acceptable salts thereof and solvates thereof such as for instance hydrates including solvates of the free compounds or solvates of a salt of the compound. 
     Some of the compounds in Table 1 can exist in more than one tautomeric form. The invention includes methods for using all such tautomers. 
     In addition, within the scope of the invention is the use of prodrugs of the TRPC6 inhibitors within the methods of treatment of the invention. Prodrugs include those compounds that, upon simple chemical transformation, are modified to produce compounds of the invention. 
     Simple chemical transformations include hydrolysis, oxidation and reduction. Specifically, when a prodrug is administered to a patient, the prodrug may be transformed into a compound disclosed hereinabove, thereby imparting the desired pharmacological effect. 
     For all compounds disclosed herein above in this application, in the event the nomenclature is in conflict with the structure, it shall be understood that the compound is defined by the structure. 
     Assessment of Biological Activity 
     Example 1: Reduction of LPS-Induced Vascular Leakage in a Mouse Model 
     Mice are placed in a chamber and exposed to Lipopolysaccharide (LPS, knows as endotoxin and found in outer membrane of Gram-negative bacteria such as  Escherichia Coli ) aerosol (0.8 mg/ml) for 30 min (or Phosphate-Buffered Saline, PBS as vehicle). The TRPC6 inhibitor is given orally 12 h and 2 h before LPS challenge. The mice are euthanized 4 h after the end of the LPS aerosol exposure. Blood is collected for plasma exposure of the compound and the lungs are flushed with 0.8 ml PBS. The broncho-alveolar-lavage is centrifuged at 500 revolutions/min for 10 min and the supernatant is collected for the measurement of total protein according to Lowry measurement by absorbance at 660 nm. 
     LPS aerosol induced lung edema is characterized by a significant accumulation of Broncho-Alveolar-Lavage protein (BALF protein). The origin of these proteins are albumin from the blood due to the vascular hyperpermeability and proteins from the membranes of lung alveolar cells, which are damaged. In the LPS groups, BALF protein (280-310 μg/ml BALF,  FIG.  1   a    and  FIG.  1   b   ) is significantly higher than BALF protein in the PBS groups (170-180 μg/ml BALF,  FIG.  1   a    and  FIG.  1   b   ). The TRPC6 inhibitor significantly reduced BALF protein concentration of 56% at 3 mg/kg p.o. and 62% at 10 mg/kg p.o. ( FIG.  1   c   ). 
     Example 2: Treatment of SARS-CoV-2 Disorders in a Rhesus Monkey Model 
     The use of the TRPC inhibitors for treating SARS-CoV-2 disorders can be studied in a Rhesus monkey model. Eligible monkeys (male and female, ages 3 to 5 years, body weight 3.5-7.0 kg) are subject to physical examination and show no abnormality. Serological indirect immunofluorescence (IFA) excludes infections with potential simian immunodeficiency virus (SIV), simian retrovirus type D (SRV) and simian T lymphocyte virus type I (STLV-I). Eligible monkeys are sent to a quarantine room for further examination for 14 days. After passing quarantine, monkeys are transferred to the laboratory for adaptive feeding and the experiment is started. 
     Treatment and Control Groups: Monkeys in the treatment group and positive control group are inoculated with SARS-CoV-2. The TRPC6 inhibitor (solubilized in 5% hydroxypropyl-beta-cyclodextrin) is given intravenously (3 mg/kg) once daily starting 1 dpi (24 h after SARS-CoV-2 inoculation) to 6 dpi (days post-infection) to monkeys in the treatment group. Monkeys in both groups are euthanized at 7 dpi. These groups of monkeys are compared to a negative control group which is inoculated with PBS and treated with the vehicle of TRPC6 (5% hydroxypropyl-beta.cyclodextrin) 
     Results: 
     Body weight is measured at 0 dpi and 7 dpi. 
     Blood samples are collected, 1 ml/time, once every other day. Terminal blood sample (10 ml) are collected and analyzed (ELISA) for IL1β, IL6, IL11, adrenomedullin, angiopoietin-2 and CGRP, PECAM-1 and Surfactant D (SPD). 
     Lung weight is measured at 7 dpi. 
     Histopathology and immunohistochemical examination of the lung are performed at 7 dpi. Hematoxylin/eosin (H/E), periodic acid Schiff (PAS) and immunohistochemical (IHC) staining are performed. Severity of lung edema can be evaluated be pathology score. 
     Exogenous terminal deoxynucleotidyl transferase (TUNEL) assay is performed on lung tissue slides. TUNEL-positive cells may be quantified. 
     Chest X-ray&#39;s are performed at 0 dpi and 7 dpi. 
     The results of the above measurements and assays can be used to show that the TRPPC inhibitors of the invention are useful for treating disorders of the lung (such as pulmonary (lung) edema) that may arise out of SARS-CoV-2 infection. 
     Example 3: Reduction of H1N1-Induced Vascular Leakage in a Mouse Model 
     Mice were inoculated intranasally with 200 PFU (Plaque Formation Unit) of virus Influenza A (strain: PR8/34/H1N1). TRPC6 was given at 3 mg/kg p.o. 2 h after inoculation and once daily from day 1 to day 4. Evans blue was injected intravenously on day 6, 30 min prior to the euthanasia. The Broncho-Alveolar Lavage Fluid (BALF) was collected and centrifuged at 500 revolutions/min for 10 min. The supernatant was collected for the measurement of Evans blue by spectrophotometry at the absorbance of 620 nm 
     At day 6 after inoculation, H1N1 induced lung vascular leakage characterized by an increase in Evans blue extravasation from the blood to the BALF. In the H1N1 group, BALF Evans blue (29 μg/ml) was significantly higher than BALF Evans blue in the vehicle group (7 μg/ml). The TRPC6 inhibitor significantly reduced BALF Evans blue of 24% at 3 mg/kg p.o. 
     Methods of Therapeutic Use 
     The inhibition of TRPC6 is an attractive means for treating or alleviating disorders associated with vascular hyperpermeability and/or conditions arising therefrom. The compounds disclosed herein are particularly effective for treating and/or alleviating these disorders, diseases and conditions including, for example: lung vascular hyperpermeability, pulmonary (lung) edema, lung ischemia reperfusion, acute respiratory distress syndrome (ARDS), acute lung injury (ALI), severe acute respiratory syndrome (SARS), Middle Eastern respiratory syndrome (MERS), sepsis, severe sepsis, and septic shock. 
     In one embodiment, the present invention provides methods for reducing lung vascular hyperpermeability by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment, the present invention provides methods for treating or alleviating pulmonary edema by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment, the present invention provides methods for treating ARDS, including low, mild, and severe ARDS (based on the degree of hypoxemia), by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment, the present invention provides methods for treating ARDS by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment, the present invention provide methods for treating SARS by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment, the present invention provides methods for treating MERS by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment, the present invention provides methods for treating sepsis, severe sepsis, and/or septic shock by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In one embodiment, the present invention provides methods for treating or alleviating a respiratory disorder or condition described herein that arises from a viral (such as influenza H1N1, Respiratory syncytial virus, Herpesviridae, parainfluenza, adenovirus) or bacterial (such as  Legionella pneumophila, Haemophilus influenzae, Sterptococcus pneumonia, Klebsiella, Mycoplasma  pneumonia;  Staphylococcus aureus ) or fungal (fungal pneumonia) parasites (parasitic pneumonia) infection. Nonlimiting examples of viral infections include human coronavirus (CoV) infections such as SARS-CoV, SARS-CoV-2 and MERS-CoV by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     In another embodiment, the present invention relates to the treatment of a respiratory disorder or condition arising from a viral or bacterial infection, wherein the respiratory disorder or condition is selected from the group consisting of lung vascular hyperpermeability, pulmonary (lung) edema, lung ischemia reperfusion, acute respiratory distress syndrome (ARDS), acute lung injury (ALI), and severe acute respiratory syndrome (SARS) by administering to a patient in need thereof a pharmaceutically effective amount of a TRPC6 inhibitor of formula (I) as defined hereinbefore or of a compound selected from the group consisting of compounds 1 to 95, but preferably of a compound selected from the group consisting of compounds 6, 16, 17, 29, 31, 33, 34, 40, 41, 44, 49, 54, 56, 57, 66, 80, 83, 85, 87, 88, and 90 depicted in Table 1, or a pharmaceutically acceptable salt thereof. 
     For therapeutic use, the compounds of the invention may be administered via a pharmaceutical composition in any conventional pharmaceutical dosage form in any conventional manner. Conventional dosage forms typically include a pharmaceutically acceptable carrier suitable to the particular dosage form selected. Routes of administration include, but are not limited to, intravenously, intramuscularly, subcutaneously, intrasynovially, by infusion, sublingually, transdermally, orally, topically or by inhalation. The preferred modes of administration are oral and intravenous. 
     The compounds of this invention may be administered alone or in combination with adjuvants that enhance stability of the inhibitors, facilitate administration of pharmaceutical compositions containing them in certain embodiments, provide increased dissolution or dispersion, increase inhibitory activity, provide adjunct therapy, and the like, including other active ingredients. In one embodiment, for example, multiple compounds of the present invention can be administered. Advantageously, such combination therapies utilize lower dosages of the conventional therapeutics, thus avoiding possible toxicity and adverse side effects incurred when those agents are used as monotherapies. Compounds of the invention may be physically combined with the conventional therapeutics or other adjuvants into a single pharmaceutical composition. Advantageously, the compounds may then be administered together in a single dosage form. In some embodiments, the pharmaceutical compositions comprising such combinations of compounds contain at least about 5%, but more preferably at least about 20%, of a compound of the invention (w/w) or a combination thereof. The optimum percentage (w/w) of a compound of the invention may vary and is within the purview of those skilled in the art. Alternatively, the compounds of the present invention and the conventional therapeutics or other adjuvants may be administered separately (either serially or in parallel). Separate dosing allows for greater flexibility in the dosing regimen. 
     As mentioned above, dosage forms of the compounds of this invention may include pharmaceutically acceptable carriers and adjuvants known to those of ordinary skill in the art and suitable to the dosage form. These carriers and adjuvants include, for example, ion exchangers, alumina, aluminum stearate, lecithin, serum proteins, buffer substances, water, salts or electrolytes and cellulose-based substances. Preferred dosage forms include tablet, capsule, caplet, liquid, solution, suspension, emulsion, lozenges, syrup, reconstitutable powder, granule, suppository and transdermal patch. Methods for preparing such dosage forms are known (see, for example, H. C. Ansel and N. G. Popovish, Pharmaceutical Dosage Forms and Drug Delivery Systems, 5th ed., Lea and Febiger (1990)). Dosage levels and requirements for the compounds of the present invention may be selected by those of ordinary skill in the art from available methods and techniques suitable for a particular patient. In some embodiments, dosage levels range from about 1-1000 mg/dose for a 70 kg patient. Although one dose per day may be sufficient, up to 5 doses per day may be given. For oral doses, up to 2000 mg/day may be required. As the skilled artisan will appreciate, lower or higher doses may be required depending on particular factors. For instance, specific dosage and treatment regimens will depend on factors such as the patient&#39;s general health profile, the severity and course of the patient&#39;s disorder or disposition thereto, and the judgment of the treating physician. 
     The compounds of the invention may be used alone or in combination of one or more additional therapeutic agents. Nonlimiting examples of additional therapeutic agents may include: 
     antimalarials such as hydroxychloroquine or chloroquine, each with or without azithromycin; 
     virostatic nucleosid analogs such as remdesivir; 
     HIV-protease inhibitors such as lopinavir-ritonavir; 
     angiotensin II receptor antagonists (angiotensin receptor blockers (ARBs)) such as candesartan, eprosartan, candesartan, irbesartan, losartan, olmesartan, telmisartan, valsartan, azilsartan, and medoxomil; 
     angiotensin converting enzyme inhibitors (e.g., benazepril, captopril, enalapril, fosinopril, lisinopril, moexipril, and perindopril); 
     anticoagulants (e.g. dabigatran, actylise, Warfarin, heparin, and acetylsalicylic acid); antidiabetics such as alpha-glucosidase inhibitors (e.g., miglitol and acarbose), amylin analogs (e.g., pramlintide), dipeptidyl peptidase 4 inhibitors (e.g., alogliptin, sitagliptin, saxagliptin, and linagliptin), incretin mimetics (e.g., liraglutide, exenatide, liraglutide, exenatide, dulaglutide, albiglutide, and lixisenatide), insulin, meglitinides (e.g., repaglinide and nateglinide), biguanides (e.g., metformin); SGLT-2 inhibitors (e.g., canagliflozin, empagliflozin, and dapagliflozin), sulfonylureas (e.g., chlorpropamide, glimepiride, glyburide, glipizide, glyburide, tolazamide, and tolbutamide), and thiazolidinediones (e.g., rosiglitazone and pioglitazone); CGRP antagonists (such as olcegepant, valcegepant); 
     bronchodilators including short-acting and long-action beta agonists (e.g., albuterol, levalbuterol, salmeterol, formoterol, arformoterol, vilanterol, indacaterol and olodaterol) and short- and long-acting anticholinergics (ipratropium, tiotropium, umeclidinium, glycopyrrolatei and aclidinium); 
     steroids such as fluticasone and budesonide; and 
     corticosteroids such as dexamethasone, prednisone, methylprednisolone, and hydrocortisonea. 
     In one embodiment, the one or more additional therapeutic agents comprises one or more monoclonal antibodies that block infectivity of SARS-CoV-2 including REGN10933 and REGN10987 and combinations or REGN10933 and REGN10987 (REGN-COV2). 
     In another embodiment the compounds of the invention may be used in combination with anti-IL-6 antibodies, such as tocilizumab, sarilumab, siltuximab, levilimab, olokizumab (CDP6038), elsilimomab, clazakizumab (BMS-945429, ALD518), sirukumab (CNTO 136), levilimab (BCD-089), CPSI-2364 (an apparent macrophage-specific inhibitor of the p38 mitogen-activated protein kinase pathway), ALX-0061, ARGX-109, FE301 and FM101. 
     In yet another embodiment the compounds of the invention may be used in combination with various kinase inhibitors providing immunomodulatory effects (A. P. Kater et al., Blood Adv. 2021 Feb. 9; 5(3): 913-925), such as TKIs approved or in late-stage development for the treatment of hematological malignancies, including inhibitors of 
     Bruton&#39;s tyrosine kinase (BTK), such as ibrutinib, acalabrutinib, zanubrutinib, or tirabrutinib, 
     spleen tyrosine kinase (SYK), such as fostamatinib, entospletinib, or cerdulatinib, 
     BCR-Abl, such as imatinib, nilotinib, dasatinib, bosutinib, ponatinib, or radotinib, 
     phosphatidylinositol 3-kinase (PI3K)/mammalian target of rapamycin (mTOR), such as idelalisib, copanlisib, duvelisib, umbralisib, or temsirolimus, 
     JAK/STAT, such as ruxolitinib, fedratinib, momelotinib, or pacritinib, and 
     FMS-like tyrosine kinase 3 (FLT3), such as midostaurin, sunitinib, sorafenib, gilteritinib, crenolanib, or quizartinib. 
     In a further embodiment the compounds of the invention may be used in combination with antifibrotics, such as nintedanib or pirfenidone, as patients in need of mechanical ventilation tend to develop lung fibrosis. 
     When used as combination treatment of a pharmaceutical combination, the compounds of the invention and the one or more additional agents can be administered in the same dosage form or different dosage forms. The compounds of the invention and the one or more additional agents can be administered simultaneously or separately, as part of a regimen. 
     Example 3: Treatment of SARS-CoV-2 Disorders in Humans 
     The use of the TPRPC inhibitors for treating SARS-CoV-2 disorders can be studied in adult human patients, for example, to show the efficacy and safety of a TRPC6 inhibitor according to the invention, compared to placebo in reducing risk or severity of acute respiratory distress syndrome (ARDS) in patients hospitalized for COVID-19. This treatment could occur on the background of other therapies shown to have benefit in these patients. One particular TRPC6 inhibitor of the invention (BI 764198) has been shown to be well tolerated in a Phase 1 study in healthy adults (NCT03854552). BI 764198 is expected to reduce vascular hyper-permeability and oedema in the lungs of patients infected with SARS-CoV-2, potentially mitigating risk of respiratory complications and mortality from the disease. By looking at complications in other organ systems, possible effects on other vascular beds might be evaluated. 
     Eligible patients: Adults (≥50 years) hospitalized for COVID-19 and having a SARS-CoV-2 infection positive (confirmed by PCR) of Grade 5 (hospitalized; oxygen by mask or nasal prongs) or Grade 6 (hospitalized; oxygen by non-invasive ventilation or high flow) based on the WHO Clinical Progression Scale. (See, WHO Working Group on the Clinical Characterization and Management of COVID-19 infection. A minimal common outcome measure set for COVID-19 clinical research. Lancet Infectious Diseases, Published Online Jun. 12, 2020, doi: 10.1016/S1473-3099(20)30483-7; 2020.) 
     Treatment and Control Groups: Eligible patients are randomly assigned to a treatment group or control group. In the treatment group, the TRPC6 inhibitor (BI 764198) is orally administered once daily to patients in a capsule or, if needed, via nasogastric intubation after dissolution of the capsule in water. In the control group, a placebo is administered once daily to patients as a capsule matching the TRPC6 inhibitor or, only if needed, via nasogastric intubation after dissolution of the capsule in water. The patients in both groups are hospitalized during the treatment period (maximum treatment of 28 days). 
     Treatment regimen: The study drug and placebo are administered after at least 6 hours fasting (no food, water allowed). Patients should remain fasted for 1.5 hours after study drug or placebo administration. The nutritional status is a recommendation and not a strict requirement. 
     Results: The primary trial objective is to estimate the treatment effect between BI 764198 and placebo. For example, patients will be monitored for clinical improvement, oxygen saturation and percentage of patients admitted to the intensive care unit. The primary comparison will be made as randomized, without regard to any treatment changes. 
     Primary endpoint: Patients alive and free of mechanical ventilation at Day 29. 
     Secondary endpoints: Improvements on the WHO Clinical Progression Scale. To be considered a “responder” to treatment with a target candidate, a patient needs to show a response. The endpoint is: time to response, defined as clinical improvement of at least 2 points (from randomisation) on the World Health Organization Clinical Progression Scale, discharge from the hospital, or considered fit for discharge (a score of 0, 1, 2, or 3 on the Clinical Progression Scale), whichever comes first, by Day 29. For example, a case where a patient who is Grade 5 (hospitalized; oxygen by mask or nasal prongs) at randomization but improves to Grade 3 (symptomatic; assistance needed) would be considered a response. A patient with a discharge from hospital or who is considered fit for discharge (a score of 0, 1, or 2 on the Clinical Progression Scale) by Day 29 will also be considered a response.
         WHO Clinical Progression Scale:   0. Uninfected; no viral RNA detected   1. Asymptomatic; viral RNA detected   2. Symptomatic; independent   3. Symptomatic; assistance needed   4. Hospitalized; no oxygen therapy   5. Hospitalized; oxygen by mask or nasal prongs   6. Hospitalized; oxygen by non-invasive ventilation or high flow   7. Intubation and mechanical ventilation, pO2/FiO2≥150 or SpO2/FiO2≥200   8. Mechanical ventilation pO2/FiO2&lt;150 (SpO2/FiO2&lt;200) or vasopressors   9. Mechanical ventilation pO2/FiO2&lt;150 and vasopressors, dialysis, or extracorporeal membrane oxygenation (ECMO)   10. Death   ECMO=extracorporeal membrane oxygenation. FiO2=fraction of inspired oxygen. NIV=non-invasive ventilation. pO2=partial pressure of oxygen. SpO2=oxygen saturation. *If hospitalised for isolation only, record status as for ambulatory patient       

     Other endpoints:
         Patients alive and discharged free of oxygen at Day 29   Number of ventilator free days by Day 29Mortality at Day 15, 29, 60, and 90   Patients with occurrence of any component of composite: In-hospital mortality or intensive care unit (ICU) admission or mechanical ventilation at Day 29