Transition Metal-Free Amidoalkylation of Benzothiazoles and Amidoalkylarylation of Activated Alkenes with N,N-Dialkylamides

A general and practical amidoalkylation reaction, using N,N-dialkylamides in the presence of potassium persulfate as the sole reagent, has been developed. 2-Amidoalkylated benzothiazole- and 3-amidoalkyl-substituted indolinone derivatives were obtained by using benzothiazoles and N-aryl-N-methyl-methacrylamides as substrates, respectively. The transformation proceeded smoothly through amidoalkyl radical intermediates that were trapped by benzothiazoles or activated alkenes.