Azetidine-substituted pyridine and pyrazine compounds as inhibitors of cannabinoid receptor 2

A compound of formula (I)

• wherein
• A is —CH— or nitrogen;
• R1 is haloalkoxyazetidinyl, halosulfonylazetidinyl, 3-fluoro-3,3-dideuteriopropyloxyazetidinyl, 2-fluoro-2,2-dideuterio-ethyloxyazetidinyl, fluorodideuteriomethoxyazetidinyl, 2-fluoro-2,2-dideuterioethylazetidinyl or fluorodideuteriomethylazetidinyl;
• R2 and R3 are both alkyl at the same time;
• or
• R2 and R3, together with the carbon atom to which they are attached, form oxetanyl;
• and
• R4 is alkoxycarbonyl or aminocarbonylalkyl;
• or a pharmaceutically acceptable salt thereof.