Spiropiperidines have emerged as valuable fragments for drug discovery and have demonstrated favorable biological properties in small molecule programs across multiple therapeutic areas. 1 Spiropiperidine frameworks are often described as privileged structures 2 because they have been successfully employed as ligands for a variety of targets including muscarinic, 3 δ-opioid, 4 melanocortin, 5 and CCR4 receptors, 6 as well as the proteins HDAC, 7 ACC, ...