Pyridin-3-ylacetaldehyde is a reagent used in the preparation of a series of platelet derived growth factor receptor tyrosine kinase (PDGF-RTK) inhibitor. Also, it is an intermediate used in the synthesis of Pyridin-3-ylacetaldehyde Sodium Salt (P991755), which is used in the synthesis of CB1/CB2 agonist that can be applied to the treatment of chronic pain. Used in the synthesis of 3-Substituted quinoline derivatives.