Provided herein are compounds and methods for treating a disorder associated with aberrant A3 peptide levels, including Alzheimer's disease. Provided herein are compositions and methods for treating a disorder associated with aberrant Aβ peptide levels, including AD. Provided herein are compounds of Formula (A) or a pharmaceutically acceptable salt thereof, wherein, L′ is selected from the group consisting of C(O), C(R1)(R2), substituted or unsubstituted —C2-6 alkylene-, and substituted or unsubstituted —C3-6 cycloalkylene.