Advances in Heterocyclic Chemistry, Volume 144 highlights new advances in the field, with this volume presenting chapters on Metal free C-H functionalization of aromatic and non-aromatic heterocyclic systems, Divergent Total Synthesis of Indolizidine-, Quinolizidine-, and Decahydroquinoline-type Poison-frog Alkaloids, A perspective on the synthetic potential of bio-based building blocks for heterocyclic chemistry, Recent advances in the synthesis of 3,3-disubstituted oxetanes, and Pyrrole-based chemosensors: Recent trends.