An　efficient　electrochemical　approach　for　the　synthesis　of　oxindoles　has　been　developed　from　electrolysis　of　a　mixture　of　sodium　sulfinate　and　acrylamide.　The　chemistry　avoids　the　utilization　of　additional　conducting　salt　and　proceeds　in　a　simple　undivided　cell　employing　a　catalytic　amount　of　NH4Br　(10　mmol%)　as　a　redox　catalyst.　The　protocol　is　practical,　as　proved　by　the　one-pot,　two-step　procedure　and　scaled-up　experiments.　Mechanistic　studies　reveal　that　the　electrochemical　approach　involves　the　formation　of　sulfonyl　radicals　via　homolytic　cleavage　of　in　situ　generated　sulfonyl　bromide.