Provided herein are compounds of Formulae (RL), (I), (II), (III), (IV), and (V), and pharmaceutically acceptable salts, solvates, hydrates, polymorphs, co-crystals, tautomers, stereoisomers, prodrugs, and isotopically labeled derivatives thereof. Also provided are pharmaceutical compositions, kits, and methods involving the inventive compounds for the treatment of metabolic disorders (e.g., diabetes, hyperglycemia, impaired glucose tolerance, insulin resistance, obesity). The compound are useful as substrate selective inhibitors of insulin-degrading enzyme (IDE).