The rhodium-catalyzed addition of an alkenyl C-H bond to isocyanates via sp(2) C-H bond activation followed by an intramolecular cyclization is described. This atom-economic and catalytic reaction affords a simple and straightforward access to biologically relevant 5-ylidene pyrrol-2(5H)-ones and can be carried out under mild and neutral conditions in the absence of any additives and environmentally hazardous waste production.
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