A compound of formula I or a pharmaceutically acceptable salt thereof, wherein, independently for each occurrence: Y is CH or N; Ar 1 is a 5-6 membered aromatic monocyclic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is optionally fused to a 5-membered monocyclic aromatic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein Ar 1 has m substituents, each independently selected from - WR W; m is an integer from 0 to 5 inclusive; W is a bond or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-, -CO-, -S-, -SO-, or -SO 2 -; R W is absent, H, halogen, OH, NH 2, NHR', NO 2, CN, CF 3, OCF 3, or a 3-6 membered saturated, partially unsaturated, or fully unsaturated monocyclic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; R' is C 1 -C 6 alkyl; R 1 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen and wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 2 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 3 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 4 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 5 is H, halogen, CN, or -X-R X; R 5' is H, halogen, CN, or -X-R X; R 6 is H, halogen, CN, or -X-R X; R 6' is H, halogen, CN, or -X-R X; R 7 is H, halogen, CN, or -X-R X; X is a bond or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; and R X is absent, H, or C 3 -C 8 cycloaliphatic, wherein up to two non-adjacent CH 2 units of said C 3 -C 8 cycloaliphatic may be replaced with -O- and said C 3 -C 8 cycloaliphatic is substituted with 0-3 substituents selected from halogen and C 1 -C 4 alkyl. Y is CH or N; Ar 1 is a 5-6 membered aromatic monocyclic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is optionally fused to a 5-membered monocyclic aromatic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein Ar 1 has m substituents, each independently selected from - WR W; m is an integer from 0 to 5 inclusive; W is a bond or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-, -CO-, -S-, -SO-, or -SO 2 -; R W is absent, H, halogen, OH, NH 2, NHR', NO 2, CN, CF 3, OCF 3, or a 3-6 membered saturated, partially unsaturated, or fully unsaturated monocyclic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; R' is C 1 -C 6 alkyl; R 1 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen and wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 2 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 3 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 4 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 5 is H, halogen, CN, or -X-R X; R 5' is H, halogen, CN, or -X-R X; R 6 is H, halogen, CN, or -X-R X; R 6' is H, halogen, CN, or -X-R X; R 7 is H, halogen, CN, or -X-R X; X is a bond or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; and R X is absent, H, or C 3 -C 8 cycloaliphatic, wherein up to two non-adjacent CH 2 units of said C 3 -C 8 cycloaliphatic may be replaced with -O- and said C 3 -C 8 cycloaliphatic is substituted with 0-3 substituents selected from halogen and C 1 -C 4 alkyl.