How is 2,3-Dichloro-4-(trifluoromethyl)pyridine (CAS: 89719-93-7) typically synthesized?

2,3-Dichloro-4-(trifluoromethyl)pyridine (CAS: 89719-93-7) is commonly synthesized via a multistep process involving the reaction of 4-chloropyridine with chlorine gas, followed by trifluoromethylation using triflic anhydride. This synthesis typically yields a product with good selectivity and high yield. The reaction conditions and catalysts used can vary, but the overall process is well-documented in the literature.