An Efficient Synthesis of a Variety of Substituted Pyridine-3-Thiols

A practical and convenient method for the synthesis of pyridine-3-thiols using substituted 3-iodopyridines as starting compounds has been developed. Based on the use of thiobenzoic acid as a sulfur donor in a two-step procedure, this approach made it possible to synthesize a number of pyridine-3-thiols with F, Cl, Br, CH3, OCH3 substituents at various positions of the pyridine ring. The procedure presented gives high yields of the target products with a purity of 95% and is suitable for synthesis in tens of grams.