Journal
GREEN CHEMISTRY
Volume 18, Issue 23, Pages 6311-6319Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6gc01970f
Keywords
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Funding
- National Natural Science Foundation of China [21272021, 21472011]
- national key research and development program [2016YFD0400801]
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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.
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