A compound of formula I wherein X is selected from CH or N, R 1 and R 2 are independently selected from the group consisting of (a) H, (b) C 1-4 alkyl, (c) C 1-4 alkyl substituted with up to 3 groups selected from cycloalkyl, heterocycle, OR 5, NR 5 R 6, SO 2 R 7 or CN, (d) heterocycle, (e) heterocycle substituted with up to three groups selected from C 1-4 alkyl, OR 8, NR 8 R 9 or CN, (f) cycloalkyl, and (g) cycloalkyl substituted with up to three groups selected from C 1-4 alkyl, OR 8, NR 8 R 9 or CN; or alternatively, NR 1 R 2 together can be a heterocycle that optionally may be substituted with C 1-4 alkyl; R 3 is selected from the group consisting of (a) C 1-6 alkyl (b) C 1-6 alkyl substituted with up to 3 groups selected from aryl, aryl substituted with Cl, F, CH 3, or CF 3, heteroaryl, cycloalkyl, heterocycle, OH, OCH 3, NR 8 R 9, and CN; (c) aryl, (d) aryl substituted with Cl, F, C 1-4 alkyl or CF 3, (e) heteroaryl, (f) cycloalkyl optionally substituted with OR 5, and (g) heterocycle; R 4, R 8 and R 9 are independently selected from the group consisting of (a) H, and (b) C 1-4 alkyl; or alternatively, NR 3 R 4 together can be a heterocycle that optionally is substituted with C 1-4 alkyl; R 5 and R 6 are independently selected from the group consisting of (a) H, and (b) C 1-4 alkyl; and R 7 is selected from the group (a) C 1-4 alkyl, and (b) cycloalkyl; or a pharmaceutically acceptable salt thereof. X is selected from CH or N, R 1 and R 2 are independently selected from the group consisting of (a) H, (b) C 1-4 alkyl, (c) C 1-4 alkyl substituted with up to 3 groups selected from cycloalkyl, heterocycle, OR 5, NR 5 R 6, SO 2 R 7 or CN, (d) heterocycle, (e) heterocycle substituted with up to three groups selected from C 1-4 alkyl, OR 8, NR 8 R 9 or CN, (f) cycloalkyl, and (g) cycloalkyl substituted with up to three groups selected from C 1-4 alkyl, OR 8, NR 8 R 9 or CN; or alternatively, NR 1 R 2 together can be a heterocycle that optionally may be substituted with C 1-4 alkyl; (a) H, (b) C 1-4 alkyl, (c) C 1-4 alkyl substituted with up to 3 groups selected from cycloalkyl, heterocycle, OR 5, NR 5 R 6, SO 2 R 7 or CN, (d) heterocycle, (e) heterocycle substituted with up to three groups selected from C 1-4 alkyl, OR 8, NR 8 R 9 or CN, (f) cycloalkyl, and (g) cycloalkyl substituted with up to three groups selected from C 1-4 alkyl, OR 8, NR 8 R 9 or CN; or R 3 is selected from the group consisting of (a) C 1-6 alkyl (b) C 1-6 alkyl substituted with up to 3 groups selected from aryl, aryl substituted with Cl, F, CH 3, or CF 3, heteroaryl, cycloalkyl, heterocycle, OH, OCH 3, NR 8 R 9, and CN; (c) aryl, (d) aryl substituted with Cl, F, C 1-4 alkyl or CF 3, (e) heteroaryl, (f) cycloalkyl optionally substituted with OR 5, and (g) heterocycle; (a) C 1-6 alkyl (b) C 1-6 alkyl substituted with up to 3 groups selected from aryl, aryl substituted with Cl, F, CH 3, or CF 3, heteroaryl, cycloalkyl, heterocycle, OH, OCH 3, NR 8 R 9, and CN; aryl, aryl substituted with Cl, F, CH 3, or CF 3, heteroaryl, cycloalkyl, heterocycle, OH, OCH 3, NR 8 R 9, and CN; (c) aryl, (d) aryl substituted with Cl, F, C 1-4 alkyl or CF 3, (e) heteroaryl, (f) cycloalkyl optionally substituted with OR 5, and (g) heterocycle; R 4, R 8 and R 9 are independently selected from the group consisting of (a) H, and (b) C 1-4 alkyl; or alternatively, NR 3 R 4 together can be a heterocycle that optionally is substituted with C 1-4 alkyl; (a) H, and (b) C 1-4 alkyl; or R 5 and R 6 are independently selected from the group consisting of (a) H, and (b) C 1-4 alkyl; and (a) H, and (b) C 1-4 alkyl; and R 7 is selected from the group (a) C 1-4 alkyl, and (b) cycloalkyl; or a pharmaceutically acceptable salt thereof. (a) C 1-4 alkyl, and (b) cycloalkyl;