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The N-alkyl-2-cyano-1-azadienes (2a) and (2b) derived from ethanolamine react with 2-vinylindole under thermal conditions to give the Michael addition adducts (9) and (9') as the principle product. In the reacaon of 2a with vinylindole the DielsAlder product (11) was also isolated. In the reaction with 2b, formation of compounds (9) was accompanied by the cyclized product (10) and the Diels-Alder adduct (13)
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Fowler et al. (1994) studied this question.
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