Cycloalkyl-substituted pyrimidinedione compounds
The present invention provides novel cycloalkyl-substituted pyrimidine dione compounds that are useful for the treatment of hypertrophic cardiomyopathy (HCM) and conditions associated with left ventricular hypertrophy or diastolic dysfunction. The synthesis and characterization of the compounds is described, as well as methods for treating HCM and other forms of heart disease.
1. A compound having the formula:
or a pharmaceutically acceptable salt thereof, wherein
R 1 is a member selected from the group consisting of C 1 -C 8 alkyl, C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkyl-C 1 -C 3 alkyl, 4- to 7-membered heterocycloalkyl, 4- to 7-membered heterocycloalkyl-C 1 -C 3 alkyl, phenyl, phenyl-C 1 -C 3 alkyl, 5- to 6-membered heteroaryl and 5- to 6-membered heteroaryl-C 1 -C 3 alkyl, wherein each R 1 is optionally substituted with from 1-3 R a ;
R 2 is a member selected from the group consisting of C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkyl-C 1 -C 3 alkyl, 4- to 7-membered heterocycloalkyl, and 4- to 7-membered heterocycloalkyl-C 1 -C 3 alkyl, wherein each R 2 is optionally substituted with from 1-5 R b ;
R 3 is a member selected from the group consisting of C 1 -C 4 alkyl, C 3 -C 4 cycloalkyl, and 4- to 7-membered heterocycloalkyl wherein each R 3 is optionally substituted with from 1-2 R c ;
R 4 is a member selected from the group consisting of H and C 1 -C 4 alkyl;
or optionally, R 3 and R 4 are combined with the carbon atom to which each is attached, to form a 3- or 4-membered cycloalkyl or heterocycloalkyl ring;
X is a member selected from the group consisting of H and F;
each R a is independently selected from the group consisting of halo, CN, hydroxyl, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy, —COR a1 , —CO 2 R a1 , SO 2 NR a1 R a2 ,
and —CONR a1 R a2 , wherein each R a1 and R a2 is independently selected from the group consisting of H and C 1 -C 4 alkyl or optionally R a1 and R a2 when attached to a nitrogen atom are combined to form a 4- to 6-membered ring;
each R b is independently selected from the group consisting of halo, CN, hydroxyl, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy, —COR b1 , —CO 2 R b1 , —SO 2 R b1 , —SO 2 NR b1 R b2 , and —CONR b1 R b2 , wherein each R b1 and R b2 is independently selected from the group consisting of H and C 1 -C 4 alkyl or optionally R b1 and R b2 when attached to a nitrogen atom are combined to form a 4- to 6-membered ring; and
each R c is independently selected from the group consisting of halo, hydroxyl and C 1 -C 2 alkoxy.
2. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein
R 1 is a member selected from the group consisting of C 1 -C 8 alkyl, C 3 -C 8 cycloalkyl, 4- to 7-membered heterocycloalkyl, phenyl, and 5- to 6-membered heteroaryl, wherein each R 1 is optionally substituted with from 1-3 R a ;
R 2 is a member selected from the group consisting of C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkyl C 1 -C 3 alkyl, and 4- to 7-membered heterocycloalkyl, wherein each R 2 is optionally substituted with from 1-5 R b ;
R 3 is a member selected from the group consisting of H, C 1 -C 4 alkyl, C 3 -C 4 cycloalkyl, and 4- to 7-membered heterocycloalkyl wherein each R 3 is optionally substituted with from 1-2 R c ;
R 4 is a member selected from the group consisting of H and C 1 -C 4 alkyl;
or optionally, R 3 and R 4 are combined with the carbon atom to which each is attached, to form a 3- or 4-membered cycloalkyl or heterocycloalkyl ring;
and wherein at least one of R 3 and R 4 is other than H;
X is a member selected from the group consisting of H and F;
each R a is independently selected from the group consisting of halo, CN, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, —COR a1 , —CO 2 R a1 , —SO 2 R a1 , —SO 2 NR a1 R a2 , and —CONR a1 R a2 , wherein each R a1 and R a2 is independently selected from the group consisting of H and C 1 -C 4 alkyl or optionally R a1 and R a2 when attached to a nitrogen atom are combined to form a 4- to 6-membered ring;
each R b is independently selected from the group consisting of halo, CN, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, —COR b1 , —CO 2 R b1 , —SO 2 R b1 , —SO 2 NR b1 R b2 , and —CONR b1 R b2 , wherein each R b1 and R b2 is independently selected from the group consisting of H and C 1 -C 4 alkyl or optionally R b1 and R b2 when attached to a nitrogen atom are combined to form a 4- to 6-membered ring; and
each R c is independently selected from the group consisting of halo and C 1 -C 2 alkoxy.
3. A compound of claim 1 , wherein X is H.
4. A compound of claim 1 , wherein R 1 is selected from the group consisting of C 3 -C 4 alkyl, C 3 -C 5 cycloalkyl, and 4- to 6-membered heterocycloalkyl, wherein each R 1 is optionally substituted with from 1-2 R a .
5. A compound of claim 1 , wherein R 1 is selected from the group consisting of phenyl and 5- to 6-membered heteroaryl, wherein each R 1 is optionally substituted with from 1-3 R a .
6. A compound of claim 1 , wherein R 1 is selected from the group consisting of C 3 -C 4 alkyl, C 3 -C 5 cycloalkyl, and 4- to 6-membered heterocycloalkyl.
7. A compound of claim 1 , wherein R 1 is 4- to 6-membered heterocycloalkyl, optionally substituted with from 1-2 R a selected from the group consisting of C 1 -C 4 alkyl, C 1 -C 4 alkoxy, —COR a1 , —CO 2 R a1 , —SO 2 R a1 , —SO 2 NR a1 R a2 , and —CONR a1 R a2 , wherein each R a1 and R a2 is independently selected from the group consisting of H and C 1 -C 4 alkyl.
8. A compound of claim 1 , wherein R 1 is selected from the group consisting of cyclobutyl, isopropyl, isobutyl, 1-methoxypropan-2-yl, cyclopentyl, cyclohexyl, 4-tetrahydropyranyl, 1-(methylsulfonyl)piperidin-4-yl, 1-(methoxycarbonyl)piperidin-4-yl, 4,4-difluorocyclohexyl, phenyl, 2-pyridyl, 3-pyridyl, 3-isoxazolyl, 5-isoxazolyl, and 1-methyl-3-pyrazolyl.
9. A compound of claim 1 , wherein R 2 is selected from the group consisting of C 4 -C 6 cycloalkyl, C 4 -C 6 cycloalkyl C 1 -C 2 alkyl, and 5- to 6-membered heterocycloalkyl, wherein each R 2 is optionally substituted with from 1-2 R b .
10. A compound of claim 1 , wherein R 2 is cyclohexyl, 4,4-difluorocyclohexyl or (4,4-difluorocyclohexyl)methyl.
11. A compound of claim 1 , wherein R 2 is 4- to 7-membered heterocycloalkyl, which is optionally substituted with from 1-2 R b .
12. A compound of claim 1 , wherein R 3 is selected from the group consisting of C 1 -C 4 alkyl, C 1 -C 4 alkoxyalkyl, and C 3 -C 4 cycloalkyl.
13. A compound of claim 1 , wherein R 3 is selected from the group consisting of methyl, ethyl, propyl, cyclopropyl, cyclobutyl and 2-methoxymethyl.
14. A compound of claim 1 , wherein R 3 is methyl.
15. A compound of claim 1 , wherein R 4 is H, methyl or ethyl.
16. A compound of claim 1 , wherein R 3 is methyl and R 4 is H.
17. A compound of claim 1 , wherein R 1 is isopropyl; R 2 is selected from the group consisting of C 4 -C 6 cycloalkyl, C 4 -C 6 cycloalkyl C 1 -C 2 alkyl, and 5- to 6-membered heterocycloalkyl, wherein each R 2 is optionally substituted with from 1-2 R b ; R 3 is methyl; and R 4 is H.
18. A compound of claim 1 , wherein R 1 is selected from the group consisting of phenyl and 5- to 6-membered heteroaryl, wherein each R 1 is optionally substituted with from 1-3 R a ; R 2 is selected from the group consisting of C 4 -C 6 cycloalkyl, C 4 -C 6 cycloalkyl-C 1 -C 2 alkyl, and 5- to 6-membered heterocycloalkyl, wherein each R 2 is optionally substituted with from 1-2 R b ; R 3 is methyl; and R 4 is H.
19. A pharmaceutical composition comprising a compound of claim 1 and a pharmaceutically acceptable excipient.
20. A compound of claim 1 , selected from the group consisting of:
or a pharmaceutically acceptable salt thereof.