Nucleophilicity of 3-Alkyl-2-(N-cyanoimino)thiazolidines: Methylated Products and Their Reactivity

3-Alkyl-2-(N-cyanoimino)thiazolidines were methylated mainly at the nitrile nitrogen atom with trimethyloxonium tetrafluoroborate (Me 3 O.BF 4 ). The reaction of the methylated products, the nitrilium salts, with sodio diethyl malonate was described