An efficient synthesis of spiro[cyclohexane-1,3′-indol-2′(3′H)-ones]via radical cyclisation

Abstract
Treatment of the o-bromo-N-acryloylanilides (4) with tri-n-butylstannane leads to the formation of 3-substituted- and 3,3-disubstituted-2-oxindoles (5) in high yield.

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