Modulators of cystic fibrosis transmembrane conductance regulator

A compound of Formula I

• or pharmaceutically acceptable salts thereof, wherein:
• ring A is selected from:
• wherein:
• R1 is —CH3, —CF3 or —CN;
• R2 is hydrogen, —CH3, —CF3, —OH, or —CH2OH;
• R3 is hydrogen, —CH3, —OCH3, or —CN;
• Ra is hydrogen or a silyl protecting group selected from the group consisting of trimethylsilyl (TMS), tert-butyldiphenylsilyl (TBDPS), tert-butyldimethylsilyl (TBDMS) triisopropylsilyl (TIPS), and [2-(trimethylsilyl)ethoxy]methyl (SEM);
• provided that both R2 and R3 are not simultaneously hydrogen;
• and
• one of X and Y is nitrogen and the other is carbon.