# US 10,117,858 B2 · Pyridine and pyrazine derivative for the treatment of CF

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- Number: US 10,117,858 B2
- Document ID: US10117858B2
- Status: Granted
- Kind: B2
- Application number: 15/156,528
- Filed: 2016-05-17
- Published: 2017-03-16
- Granted: 2018-11-06
- Earliest claimed: 2010-03-19
- Assignees: Novartis AG
- Applicants: Novartis AG
- Inventors: Urs Baettig; Kamlesh Bala; Emma Budd; Lee Edwards; Catherine Howsham; Glyn Alan Hughes; Darren Mark LeGrand; Katrin Spiegel
- Web page: https://patentgrep.com/patent/US10117858B2

## CPC

- A61K 31/44: Non condensed pyridines; Hydrogenated derivatives thereof
- A61K 31/4412: having oxo groups directly attached to the heterocyclic ring
- A61K 31/4418: having a carbocyclic group directly attached to the heterocyclic ring, e.g. cyproheptadine
- A61K 31/443: containing a five-membered ring with oxygen as a ring hetero atom
- A61K 31/4439: containing a five-membered ring with nitrogen as a ring hetero atom, e.g. omeprazole (nicotine A61K31/465)
- A61K 31/444: containing a six-membered ring with nitrogen as a ring heteroatom, e.g. amrinone
- A61K 31/4545: containing a six-membered ring with nitrogen as a ring hetero atom, e.g. pipamperone, anabasine
- A61K 31/4965: Non-condensed pyrazines
- A61K 31/497: containing further heterocyclic rings
- A61K 31/5377: not condensed and containing further heterocyclic rings, e.g. timolol
- A61K 45/06: Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
- A61P 1/02: Stomatological preparations, e.g. drugs for caries, aphtae, periodontitis
- A61P 1/10: Laxatives
- A61P 11/00: Drugs for disorders of the respiratory system
- A61P 11/06: Antiasthmatics
- A61P 11/08: Bronchodilators
- A61P 11/12: Mucolytics
- A61P 19/04: for non-specific disorders of the connective tissue
- A61P 27/02: Ophthalmic agents
- A61P 29/00: Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
- A61P 31/00: Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P 35/00: Antineoplastic agents
- A61P 37/08: Antiallergic agents (antiasthmatic agents A61P11/06; ophthalmic antiallergics A61P27/14)
- C07D 213/38: having only hydrogen or hydrocarbon radicals attached to the substituent nitrogen atom
- C07D 213/81: Amides; Imides
- C07D 241/26: with nitrogen atoms directly attached to ring carbon atoms
- C07D 241/28: in which said hetero-bound carbon atoms have double bonds to oxygen, sulfur or nitrogen atoms
- C07D 401/04: directly linked by a ring-member-to-ring-member bond
- C07D 401/12: linked by a chain containing hetero atoms as chain links
- C07D 403/12: linked by a chain containing hetero atoms as chain links
- C07D 405/04: directly linked by a ring-member-to-ring-member bond
- C07D 405/12: linked by a chain containing hetero atoms as chain links
- C07D 413/04: directly linked by a ring-member-to-ring-member bond
- C07D 413/12: linked by a chain containing hetero atoms as chain links
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61P: SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

The present invention provides pyridine and pyrazine derivatives which restore or enhance the function of mutant and/or wild type CFTR to treat cystic fibrosis, primary ciliary dyskinesia, chronic bronchitis, chronic obstructive pulmonary disease, asthma, respiratory tract infections, lung carcinoma, xerostomia and keratoconjunctivitis sire, or constipation (IBS, IBD, opioid induced). Pharmaceutical compositions comprising such derivatives are also encompassed.

## Claims

### Claim 1

A method for the treatment of primary ciliary dyskinesia in a subject in need of treatment thereof comprising administering an effective amount of at least one compound of Formula I
or a pharmaceutically acceptable salt thereof, wherein:
A is N or CR4a;
R1 is H; C1-C8 alkyl optionally substituted by one or more halogen atoms; C2-C8 alkenyl; C2-C8 alkynyl; C3-C10 cycloalkyl; C5-C10 cycloalkenyl; —C1-C4 alkyl-C3-C8 cycloalkyl; C1-C8 alkoxy optionally substituted by one or more halogen atoms; halogen; SO2NR8R9; SO2R10; S—C1-C8alkyl optionally substituted by one or more halogen atoms; S—C6-C14 aryl; CN; NR11R12; C(O)NR13R14; NR13SO2R15; NR3C(O)R15, CO2R15, —(C0-C4 alkyl)-C6-C14 aryl; or —(C0-C4 alkyl)-3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S; wherein the cycloalkyl, cycloalkenyl, aryl and heterocyclyl groups are each optionally substituted by one or more Z substituents;
R2 is C1-C4 haloalkyl;
R3 and R4a are each independently H or C1-C8 alkyl optionally substituted by one or more halogen atoms;
R4 is H, or C1-C8 alkyl optional substituted with one or more halogen atoms;
R5 is —(CH2)m—NR17R18, —(CH2)m—OR′; C1-C8 alkoxy optionally substituted by one or more halogen atoms; —(C0-C4 alkyl)-CO2R15; —(C0-C4 alkyl)-C6-C14 aryl or -3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S; wherein the —(C0-C4 alkyl)-C6-C14 aryl and —(C0-C4 alkyl)-3 to 14 membered heterocyclic group are each optionally substituted by one or more Z substituents;
R6 is C1-C8 alkyl optionally substituted by one or more halogen atoms; C3-C10 cycloalkyl; —C1-C4 alkyl-C3-C8 cycloalkyl; C1-C8 alkoxy optionally substituted by one or more halogen atoms; OH; CN; halogen; —(C0-C4 alkyl)-C6-C14 aryl; or —(C0-C4 alkyl)-3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S; wherein the cycloalkyl, cycloalkenyl, —(C0-C4 alkyl)-C6-C14 aryl and —(C0-C4 alkyl)-3 to 14 membered heterocyclic group are each optionally substituted by one or more Z substituents; or
R6 is H, and R5 is —(CH2)m—NR17R18, —(CH2)m—OR′, C1-C8 alkoxy optionally substituted by one or more halogen atoms; —(C0-C4 alkyl)-C6-C14 aryl; —(C0-C4 alkyl)-3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S; or —(C0-C4 alkyl)-CO2R15, wherein —(C0-C4 alkyl)-C6-C14 aryl and —(C0-C4 alkyl)-3 to 14 membered heterocyclic group groups are each optionally substituted by one or more Z substituents; or
R4 and R6 together with the carbon atoms to which they are bound form a 3 to 8 membered carbocyclic ring system; or
R4 and R5 together form an oxo group (C═O) and R6 is C1-C4 alkyl optionally substituted by one or more halogen atoms; C1-C4 alkoxy optionally substituted by one or more halogen atoms; —(C0-C4 alkyl)-C6-C14 aryl; or —(C0-C4 alkyl)-3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S, wherein the aryl and heterocyclyl groups are each optionally substituted by one or more Z substituents; or
R5 and R6 together with the carbon atoms to which they are bound a 5 to 8 membered heterocyclic ring system containing one or more heteroatoms selected from N, O and S, wherein the ring system is optionally substituted by one or more Z substituents; or
R4 and R5 and R6 together with the carbon atoms to which they are bound form a 5 to 8 membered heterocyclic ring system containing one or more heteroatoms selected from N, O and S, wherein the ring system is optionally substituted by one or more Z substituents;
R′ is H, or C1-C8 alkyl optional substituted with one or more halogen atoms;
m is 0, 1, 2 or 3;
R8, R11, R13 and R17 are each independently H, C1-C8 alkyl optionally substituted by one or more halogen atoms, C3-C10 cycloalkyl or —(C1-C4 alkyl)-C3-C8 cycloalkyl;
R9, R10, R12, R14, R15, R16 and R18 are each independently H; C1-C8 alkyl optionally substituted by one or more halogen atoms; C2-C8 alkenyl; C2-C8 alkynyl; C3-C10 cycloalkyl; C5-C10 cycloalkenyl; —C1-C4 alkyl-C3-C8 cycloalkyl; —(C0-C4 alkyl)-C6-C14 aryl; or —(C0-C4 alkyl)-3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S, wherein the cycloalkyl, cycloalkenyl, aryl and heterocyclyl groups are each optionally substituted by one or more Z substituents; or
R8 and R9, R11 and R12, R13 and R14, and R17 and R18 together with the nitrogen atom to which they are attached may form a 4 to 14 membered heterocyclic group optionally substituted by one or more Z substituents;
Z is independently OH, aryl, O-aryl, benzyl, O-benzyl, C1-C6 alkyl optionally substituted by one or more OH groups or NH2 groups, C1-C6 alkyl optionally substituted by one or more halogen atoms, C1-C6 alkoxy optionally substituted by one or more OH groups or C1-C4 alkoxy, (SO2)NR19R21, (SO2)R21, C(O)NR19R21, C(O)OR19, C(O)R19, SR19, OR19, oxo, CN, NO2, halogen or a 3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S;
R19 and R20 are each independently H; C1-C8 alkyl; C3-C8 cycloalkyl; C1-C4 alkoxy-C1-C4 alkyl; (C0-C4 alkyl)-aryl optionally substituted by one or more groups selected from C1-C6 alkyl, C1-C6 alkoxy and halogen; (C0-C1 alkyl)-3- to 14-membered heterocyclic group, the heterocyclic group including one or more heteroatoms selected from N, O and S, optionally substituted by one or more groups selected from halogen, oxo, C1-C6 alkyl and C(O)C1-C6 alkyl; (C0-C4 alkyl)-O-aryl optionally substituted by one or more groups selected from C1-C6 alkyl, C1-C6 alkoxy and halogen; and (C0-C4 alkyl)-O-3- to 14-membered heterocyclic group, the heterocyclic group including one or more heteroatoms selected from N, O and S, optionally substituted by one or more groups selected from halogen, C1-C6 alkyl or C(O)C1-C6 alkyl; wherein the alkyl groups are optionally substituted by one or more halogen atoms, C1-C4 alkoxy, C(O)NH2, C(O)NHC1-C6 alkyl or C(O)N(C1-C6 alkyl)2; or
R19 and R20 together with the nitrogen atom to which they attached form a 5- to 10-membered heterocyclic group, the heterocyclic group including one or more further heteroatoms selected from N, O and S, the heterocyclic group being optionally substituted by one or more substituents selected from OH; halogen; aryl; 5- to 10-membered heterocyclic group including one or more heteroatoms selected from N, O and S; S(O)2-aryl; S(O)2—C1-C6 alkyl; C1-C6 alkyl optionally substituted by one or more halogen atoms; C1-C6 alkoxy optionally substituted by one or more OH groups or C1-C4 alkoxy; and C(O)OC1-C6 alkyl, wherein the aryl and heterocyclic substituent groups are themselves optionally substituted by C1-C6 alkyl, C1-C6 haloalkyl or C1-C6 alkoxy to a subject in need of such treatment.

### Claim 2 (depends on 1)

The method according to claim 1, wherein A is CR4a.

### Claim 3 (depends on 1)

The method according to claim 1, wherein
R1 is C1-C8 alkyl optionally substituted by one or more halogen atoms; C1-C8 alkoxy optionally substituted by one or more halogen atoms; halogen; Nee, C6-C14 aryl; or —(C0-C4 alkyl)-5 to 6 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S, wherein the aryl and heterocyclic groups are each optionally substituted by one or more Z substituents.

### Claim 4 (depends on 1)

The method according to claim 1, wherein
R1 is C1-C4 alkyl optionally substituted by one or more halogen atoms; C1-C4 alkoxy optionally substituted by one or more halogen atoms; or halogen.

### Claim 5 (depends on 1)

The method according to claim 1, wherein
R1 is aryl, wherein aryl is phenyl optionally substituted by one or more Z substituents.

### Claim 6 (depends on 1)

The method according to claim 1, wherein R2 is CF3.

### Claim 7 (depends on 1)

The method according to claim 1, wherein
R4 is H or C1-C4 alkyl optionally substituted by one or more halogen atoms;
R5 is C1-C4 alkoxy optionally substituted by one or more halogen atoms; —(CH2)m—NR17R18, —(CH2)m—OR′; or —(C0-C4 alkyl)-3 to 14 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S, wherein the aryl heterocyclyl groups is optionally substituted by one or more Z substituents;
R6 is C1-C4 alkyl optionally substituted by one or more halogen atoms; C1-C4 alkoxy optionally substituted by one or more halogen atoms; or —(C0-C4 alkyl)-C6-C14 aryl wherein the aryl is optionally substituted by one or more Z substituents; or
R4 and R6 together with the carbon atoms to which they are bound form a 3 to 6 membered carbocyclic ring system; or
R5 and R6 together with the carbon atoms to which they are bound form a 5 to 8 membered heterocyclic ring system containing one or more heteroatoms selected from N, O and S, wherein the ring system is optionally substituted by one or more Z substituents;
m is 0 or 1;
R17 and R18 are each independently H; C1-C8 alkyl optionally substituted by one or more halogen atoms.

### Claim 8 (depends on 1)

The method according to claim 1, wherein
A is CR4a;
R1 is C1-C4 alkyl optionally substituted by one or more halogen atoms; or C1-C4 alkoxy optionally substituted by one or more halogen atoms;
R2 is CF3,
R3 is H, CH3 or CF3;
R4 is H or Me;
R4a is H;
R5 is —NR17R18 or OH, and
R6 is C1-C4 alkyl optionally substituted by one or more halogen atoms.

### Claim 9 (depends on 1)

The method according to claim 1, comprising administering at least one compound of Formula II,
or a pharmaceutically acceptable salt thereof;
wherein
A is N or CR4a;
R4a is H or C1-C4 alkyl;
R1 is C1-C8 alkyl optionally substituted by one or more halogen atoms; C1-C8 alkoxy optionally substituted by one or more halogen atoms; halogen; NR11R12, C6-C14 aryl; or —(C0-C4 alkyl)-5 to 6 membered heterocyclic group, wherein the heterocyclic group contains at least one heteroatom selected from N, O and S, wherein the aryl and heterocyclic groups are each optionally substituted by one or more Z substituents;
R3 is H or CH3;
R101 is

### Claim 10 (depends on 1)

The method of claim 1, or a pharmaceutically acceptable salt thereof, wherein the compound is selected from:
3-Amino-6-(4-fluoro-phenyl)-5-trifluoromethyl-pyridine-2-carboxylic acid (3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
5-Amino-6′-methyl-3-trifluoromethyl-[2,3′]bipyridinyl-6-carboxylic acid (3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
3-Amino-6-cyclopropyl-N-(3,3,3-trifluoro-2-hydroxy-2-methylpropyl)-5-(trifluoromethyl)picolinamide;
3-Amino-6-methoxy-N-(3,3,3-trifluoro-2-hydroxy-2-(trifluoromethyl)propyl)-5-(trifluoro methyl) picolinamide;
3-Amino-6-(4-fluoro-phenyl)-5-trifluoromethyl-pyridine-2-carboxylic acid ((S)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
3-Amino-6-methoxy-5-trifluoromethyl-pyridine-2-carboxylic acid ((S)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
3-Amino-6-methoxy-5-trifluoromethyl-pyridine-2-carboxylic acid ((R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
3-Amino-6-(2,4-dichloro-phenyl)-5-trifluoromethyl-pyridine-2-carboxylic acid ((S)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
3-Amino-6-(2,4-dichloro-phenyl)-5-trifluoromethyl-pyridine-2-carboxylic acid ((R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
3-Amino-6-(4-fluoro-phenyl)-5-trifluoromethyl-pyridine-2-carboxylic acid (2-hydroxy-2-methyl-propyl)-amide;
3-Amino-5,6-bis-trifluoromethyl-pyridine-2-carboxylic acid ((S)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide;
3-Amino-5,6-bis-trifluoromethyl-pyridine-2-carboxylic acid ((R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide; and
(S)-3-amino-6-ethoxy-N-(3,3,3-trifluoro-2-hydroxy-2-methylpropyl)-5-(trifluoro methyl)picolinamide.

### Claim 11

A method for the treatment of primary ciliary dyskinesia in a subject in need of treatment thereof comprising administering an effective amount of
3-Amino-6-methoxy-5-trifluoromethyl-pyridine-2-carboxylic acid ((S)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide or a pharmaceutically acceptable salt thereof.

### Claim 12

A method for the treatment of primary ciliary dyskinesia in a subject in need of treatment thereof comprising administering an effective amount of
3-Amino-6-methoxy-5-trifluoromethyl-pyridine-2-carboxylic acid ((R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide or a pharmaceutically acceptable salt thereof.

### Claim 13

A method for the treatment of primary ciliary dyskinesia in a subject in need of treatment thereof comprising administering an effective amount of
3-Amino-6-(4-fluoro-phenyl)-5-trifluoromethyl-pyridine-2-carboxylic acid (3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide or a pharmaceutically acceptable salt thereof.

### Claim 14

A method for the treatment of primary ciliary dyskinesia in a subject in need of treatment thereof comprising administering an effective amount of
3-Amino-5,6-bis-trifluoromethyl-pyridine-2-carboxylic acid ((S)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide or a pharmaceutically acceptable salt thereof.

### Claim 15

A method for the treatment of primary ciliary dyskinesia in a subject in need of treatment thereof comprising administering an effective amount of
3-Amino-5,6-bis-trifluoromethyl-pyridine-2-carboxylic acid ((R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propyl)-amide or a pharmaceutically acceptable salt thereof.

### Claim 16 (depends on 1)

The method according to claim 1 further comprising administration of another drug substance.

### Claim 17 (depends on 16)

The method according to claim 16 wherein the other drug substance is an osmotic agent, ENaC blocker, an anti-inflammatory agent, a bronchodilatory agent, an antihistamine, an anti-tussive agent, an antibiotic agent and a DNase drug substance.