Compounds that modulates AMPA receptor function

A compound of the formula (I), or a pharmaceutically acceptable salt thereof:

• A1 is N or CR1;
• A2 is N or CR3;
• and wherein only a single one of A1 and A2 may be N;
• R1 is selected from the group consisting of:
• H, CN, C1-4 alkyl, C1-4 haloalkyl, C3-4 cycloalkyl, —C1-4 alkyl-ORA1 and —C(O)NRA1RB1;
• R2 is selected from the group consisting of:
• H, CN, C1-4 alkyl, C1-4 haloalkyl, C3-4 cycloalkyl, —C1-4 alkyl-ORA2 and —C(O)NRA2RB2;
• R3 is selected from H, C1-4 alkyl, C1-4 haloalkyl, C3-4 cycloalkyl, —C1-4 alkyl-OH and —C(O)NRA3RB3;
• each X is independently H or F, provided at least one X is F;
• B1 and B2 are independently CH or N;
• R4 is halo;
• X1 is O or CH2;
• RA1, RB1, RA2, RB2, RA3 and RB3 are each independently selected from:
• H and C1-4 alkyl;
• a is an integer selected from 0, 1 or 2;
• b is an integer selected from 0, 1 or 2;
• a+b is 0, 1, 2 or 3;
• and
• n is 0, 1 or 2;
• with the following provisos:
• R1, R2 and R3 are not all H;
• when A1 is N, at least one of R2 and R3 is C1-4 alkyl or C1-4 haloalkyl;
• when A2 is N, at least one of R1 and R2 is C1-4 alkyl or C1-4 haloalkyl;
• when A1 is CR1, R1 is —CH2OH and B1 is N, then R2 is not H;
• and
• when A1 is CR1, R1 is —CN and B2 is N, then R2 is not H.