Novel orally active NPY Y5 receptor antagonists: Synthesis and structure–activity relationship of spiroindoline class compounds

Abstract Spiroindoline urea derivatives, designed to act as NPY Y5 receptor antagonists, were synthesized and their structure–activity relationships were investigated. Of these derivatives, compound 3a showed good Y5 binding affinity with favorable pharmacokinetic properties. Compound 3a significantly inhibited bPP Y5 agonist-induced food intake in rats, and suppressed body weight gain in DIO mice.