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Direct metal-free alkenylation of 2-methylindole via acid-mediated Michael addition–elimination reaction with ethoxymethylenemalononitrile or ethyl ethoxymethylenecyanoacetate affords 3-indolyl-2-cyanoacrylonitrile and ethyl 3-indolyl-2-cyanoacrylate. Behavior of 1H-indole is predictably different.
We gratefully acknowledge partial financial support from Alzahra University Research Council.
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