Substituted heterocyclic compounds

A compound of formula I

• or a stereoisomer or pharmaceutically acceptable salt thereof,
• wherein
• X is —N— or —CH—;
• R1 is —C(O)R1a;
• or a 5-8 membered heterocycle containing 1-2 heteroatoms selected from N, O, and S, each heterocycle substituted with 0-2 R1b;
• R1a is COOC1-3 alkyl, or C3-6 cycloalkyl, said cycloalkyl group substituted with 0-2 R1b;
• R1b is independently at each occurrence, F or C1-3 alkyl;
• R2 is OMe or OCHF2;
• R3 is CD3, C1-3 alkyl, C3-6 cycloalkyl or (CH2)F;
• and
• R4 is hydrogen, halo, C1-4 alkyl, C1-4 alkoxy or C3-6 cycloalkyl.