β‐halovinyl Aldehydes: Multifaceted Versatile Building Blocks In Organic Synthesis

Abstract β‐halovinyl aldehydes serve as a valuable building blocks in organic synthesis. These aldo‐x bifunctional building blocks (AXB3s) contain a alkenic double bond (vinyl) as well as a formyl group along with a halogen atom (Cl, Br, I) bonded with the β‐carbon atom of vinyl aldehyde. Owing to the presence of these multiple reactive sites, β‐halovinyl aldehydes act as a suitable precursor for Michael addition, direct addition, addition‐elimination reactions, cross‐coupling reactions, condensation reactions, nucleophilic substitution reactions, domino reactions, MCRs, Diels‐Alder reaction, functional group transformation reactions and enantioselective transformations. Therefore, a comprehensive review on synthetic exploration of β‐halovinyl aldehydes has been carried out for the generation of reactive intermediates and diverse bioactive heterocycles by using various C−C, C−N, C−S and C−O bond forming reactions. In this review, we have assembled the literature from mid‐2007 to Jan 2024.