Аннотация:The potential of deuterated pharmaceuticals is being widely demonstrated since several deuterium-containing drugs have reached clinical trials. The methyl group is one of the most frequently occurring groups in the drugs and has impressive effect on biological activity of drugs. Here we describe the first trideuteromethylation under radical reaction conditions using deuterated dimethyl sulfoxide as reagent for the synthesis of labelled heterocycles and trideuteromethylated compounds. A broad scope of developed method for the synthesis of various scaffolds was demonstrated.