Reactivity of 2‐amino‐1,3,4‐thiadiazoles. Methylation reactions of some 2‐amino‐5‐benzoyl‐1,3,4‐thiadiazoles

Abstract Methylation reactions of 2‐amino‐5‐benzoyl‐1,3,4‐thiadiazoles 1a‐d are reported as a function of alkylating agents (methyl iodide, dimethyl sulfate‐potassium carbonate, diazomethane, dimethyl‐sulfate‐sodium methoxide). Methylation occurs at both the ring nitrogen in position 3 and the exocyclic nitrogen atom.